# PART XI -- LIGHTING INSTALLATION

### **ITEM L‑101 AIRPORT ROTATING BEACONS**

DESCRIPTION

**101‑1.1** This item shall consist of furnishing and installing airport
rotating beacons. This work shall include the mounting, leveling,
wiring, painting, servicing, and testing of the beacon and all materials
and incidentals necessary to place the beacons in operating condition as
a completed unit to the satisfaction of the Engineer. This item shall
include a mounting platform if specified in the plans.

EQUIPMENT AND MATERIALS

**101‑2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be certified and
listed under Advisory Circular (AC) 150/5345-53, Airport Lighting
Equipment Certification Program.

**b.** All other equipment and materials covered by other referenced
specifications shall be subject to acceptance through manufacturer\'s
certification of compliance with the applicable specification when
requested by the Engineer.

**c.** Manufacturer's certifications shall not relieve the Contractor of
the Contractor's responsibility to provide materials in accordance with
these specifications and acceptable to the Engineer. Materials supplied
and/or installed that do not materially comply with these specifications
shall be removed, when directed by the Engineer and replaced with
materials, which do comply with these specifications, at the sole cost
of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components or electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the Contract Documents plans and
specifications. \[The Contractor\'s submittals shall be neatly bound in
a properly sized 3-ring binder, tabbed by specification section.\] The
Engineer reserves the right to reject any and all equipment, materials
or procedures, which, in the Engineer's opinion, does not meet the
system design and the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**101-2.2 BEACON.** The beacon shall meet the requirements of AC
150/5345-12, Specification for Airport and Heliport Beacons.

**101-2.3 PANEL BOARDS AND BREAKERS.** Panel boards and breakers shall
conform to the requirements of Fed. Spec. W-P-115.

**101-2.4 WEATHERPROOF CABINETS.** The weatherproof cabinets shall
conform to National Electrical Manufacturers Association Standards and
shall be constructed of steel not less than No. 16 USS gauge.

**101-2.5 WIRE.** Wire in conduit rated up to 5,000 volts shall conform
to AC 150/5345-7, Specification for L‑824 Underground Electrical Cable
for Airport Lighting Circuits for Rubber Insulated Neoprene Covered
Wire, or Fed. Spec. J-C-30, Type RHW, for rubber insulated fibrous
covered wire. For ratings up to 600 volts, the thermoplastic wire
conforming to Fed. Spec. J-C-30, Types TW, THW, and THWN, shall be
used.  The wires shall be of the type, size, number of conductors, and
voltage shown in the plans or in the proposal.

**101-2.6 CONDUIT.** Rigid steel conduit and fittings shall conform to
the requirements of Underwriters Laboratories Standard 6, 514, and 1242.

**101-2.7 PAINT.**

**a.** Priming paint for ungalvanized metal surfaces shall be a high
solids alkyd primer conforming to TT‑P‑664D.

**b.** Priming paint for galvanized metal surfaces shall be zinc
dust-zinc oxide primer paint conforming to MIL‑DTL‑24441/19B. If
necessary, add not more than ½ pint (0.06 liter) of turpentine to each
gallon (liter).

**c.** Orange paint for the body and the finish coats on metal and wood
surfaces shall consist of a ready-mixed non-fading paint meeting the
requirements of Fed. Spec. TT-E-489. The color shall be in accordance
with Federal Standard 595, Aviation Gloss Orange Number 12197.

**d.** White paint for body and finish coats on metal and wood surfaces
shall be ready-mixed paint conforming to the Master Painter's Institute,
Reference #9, Exterior Alkyd, Gloss, VOC Range E2.

**e.** Priming paint for wood surfaces shall be mixed on the job by
thinning the above-specified orange or white paint with ½ pint (0.06 mm)
of raw linseed oil to each gallon (liter).

CONSTRUCTION METHODS

**101-3.1. PLACING THE BEACON.** The beacon shall be mounted on a beacon
tower, platform, or building roof as shown in the plans.

**101-3.2 HOISTING AND MOUNTING.** The beacon shall be hoisted to the
mounting platform by using suitable slings and hoisting tackle. Before
fastening the beacon to the mounting platform, the mounting holes shall
be checked for correct spacing. Beacon base or mounting legs shall not
be strained or forced out of position to fit incorrect spacing of
mounting holes. The beacon base shall be raised first, set in position,
and bolted in place. The drum shall then be raised and assembled to the
base.

**101-3.3 LEVELING.** After the beacon has been mounted in place, it
shall be accurately leveled following manufacturer's instructions. The
leveling shall be checked in the presence of the Engineer and shall be
to the Engineer\'s satisfaction.

**101-3.4 SERVICING.** Before placing the beacon in operation, the
Contractor shall check the manufacturer's manual for proper servicing
requirements. Follow the manufacturer's servicing requirements for each
size beacon.

**101-3.5 BEAM ADJUSTMENT.** After the beacon has been mounted and
leveled, the elevation of the beams shall be adjusted. The final beam
adjustments shall be made at night so that results can be readily
observed. The beams shall be adjusted to the elevation directed by the
Engineer or as shown in the plans, except that, in no case shall the
elevation of the beams be less than 2 degrees above the horizontal.

**101-3.6 BEACON MOUNTING PLATFORM.** Where the beacon is to be mounted
at a location other than the beacon tower and where a special mounting
platform is required, the construction of this mounting platform and any
necessary lightning protection equipment shall be in accordance with the
details shown in the plans.

**101-3.7 WIRING.** The Contractor shall furnish all necessary labor and
materials and shall make complete above ground electrical connections in
accordance with the wiring diagram furnished with the project plans. The
electrical installation shall conform to the requirements of the latest
edition of National Fire Protection Association, NFPA-70, National
Electric Code.

Copies of the National Electric Code may be obtained form the National
Fire Protection Associations, Inc., One Batterymarch Park, Quincy,
Massachusetts 02269.

If underground cable for the power feed from the transformer vault to
the beacon site and duct for this cable installation is required, the
cable, ground rods and duct shall be installed in accordance with and
paid for as described in Item L-108, Underground Power Cable for
Airports, and Item L‑110, Airport Underground Electrical Duct Banks and
Conduit.

Unless otherwise specified, the Contractor shall connect the tell-tale
relay mechanism in the beacon to energize the tower obstruction light
circuit when failure of the beacon service (primary) lamp occurs.

If lightning protection is specified in the plans or proposal as a part
of this item, it shall be installed in accordance with 103‑2.3 in Item
L-103, Airport Beacon Towers.

**101-3.8 PANEL AND CABINET.** Unless otherwise specified, the
Contractor shall furnish and install at the top of the beacon tower or
mounting platform a circuit-breaker panel consisting of four 15-ampere
breakers mounted in a weather-proof cabinet to provide separate
protection for the circuits to the beacon lamps, motor, obstruction
lights, and other equipment. The cabinet shall be located on the side of
the beacon platform, as directed by the Engineer.

**101-3.9 CONDUIT.** All exposed wiring shall be run in not less than ¾
inch (19 mm) galvanized rigid steel conduit. No conduit shall be
installed on top of a beacon platform floor. All conduit shall be
installed to provide for drainage. If mounted on a steel beacon tower,
the conduit shall be fastened to the tower members with "wraplock"
straps, clamps, or approved fasteners, spaced approximately 5 feet (150
cm) apart. The conduit shall be fastened to wooden structures with
galvanized pipe straps and with galvanized wood screws not less than No.
8 or less than 1‑¼ inches (31 mm) long. There shall be at least two
fastenings for each 10-foot (3 m) length.

**101-3.10 BOOSTER TRANSFORMER.** If shown in the plans or specified in
job specifications, a booster transformer to compensate for voltage drop
to the beacon shall be installed in a suitable weatherproof housing
under or on the tower platform or at the base of the tower. The
installation shall be as indicated in the plans and described in the
proposal. If the booster transformer is required for installation remote
from the beacon, it shall be installed in accordance with and paid for
\[ \].

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify how the booster transformer will be paid
> for when located remotely from the beacon tower, i.e. as part of the
> beacon installation or, if installed in the vault, as part of the
> vault equipment.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**101-3.11 PHOTOELECTRIC CONTROL.** If shown in the plans or specified
in job specifications, the Contractor shall furnish and install an
automatic control switch at the location indicated in the plans. The
switch shall be a photoelectric type. It shall be a standard
commercially available unit that will energize when the northern sky
illuminance falls below 60 footcandles (645.8 lux) but before reaching a
level of 35 footcandles (367.7 lux). The photoelectric switch should
de-energize when the northern sky illuminance rises to a level of not
more than 60 footcandles (645.9 lux). It shall be installed, connected,
and adjusted in accordance with the manufacturer\'s instructions.

**101-3.12 OBSTRUCTION LIGHTS.** Unless otherwise specified, the
Contractor shall install on the top of the beacon tower or mounting
platform two L-810 obstruction lights on opposite corners. These lights
shall be mounted on conduit extensions to a height of not less than 4
inches (100 mm) above the top of the beacon. They shall be connected in
series into the tell-tale circuit with the necessary relay and wiring
connections.

**101-3.13 PAINTING.** If construction of a wooden mounting platform is
stipulated in the proposal as part of this item, all wooden parts of the
platform shall be given one priming coat of white or aviation-orange
paint after fabrication but before erection and one body and one finish
coat of aviation-orange paint after erection. Steel mounting platforms
shall be given one priming coat of corrosion‑inhibiting primer before
erection and one body and one finish coat of aviation-orange paint after
erection. All equipment installed under this contract and exposed to the
weather shall be given one body and one finish coat of aviation-orange
or white paint as required. This shall include beacon (except glass
surfaces), beacon base, breaker cabinet, all conduit, and transformer
cases. It shall not include air terminals or obstruction light globes.

The paint shall be applied uniformly in the proper consistency by
skilled painters. The finished paint shall be free from sags, holidays,
and smears. Each coat of paint shall be given ample time to dry and
harden before the next coat of paint is applied. A minimum of 3 days
shall be allowed for drying on wood surfaces, and a minimum of 4 days
shall be allowed for drying on metal surfaces. Painting shall not be
done in cold, damp, foggy, dusty, or frosty atmospheres, or when air
temperature is below 40º F (4º C), nor started when the weather forecast
indicates such conditions for the day.

All surfaces shall be cleaned before painting. The surfaces shall be dry
and free from scale, grease, rust, dust, and dirt when paint is applied.
All knots in wood surfaces shall be covered with shellac immediately
before applying the priming coat of paint. Nail holes and permissible
imperfections shall be filled with putty. The ready-mixed paint shall be
thinned for the priming and body coats in accordance with the
manufacturer\'s recommendations. In the absence of such recommendations,
the following shall apply:

**a.** Body coats (for both wood and steel surfaces) - add ½ pint (0.06
liter) of turpentine to each gallon (liter) of ready-mixed paint for
body coats.

**b.** Finish coats (for both wood and steel surfaces) the ready-mixed
paint shall be used as it comes from the container for finish coats.

**101-3.14 TESTING.** The installation shall be fully tested in
operation as a completed unit prior to acceptance. These tests shall
include operation of the lamp-changer operation and taking megger and
voltage readings. The insulation resistance to ground of the beacon
supply circuit shall be not less than 50 megohms. Testing equipment
shall be furnished by the Contractor. Tests shall be conducted in the
presence of the Engineer and shall be to the Engineer's satisfaction.

METHOD OF MEASUREMENT

**101-4.1** The quantity to be paid for shall be the number of beacons
installed as completed units in place, accepted, and ready for
operation.

# 

# 

BASIS OF PAYMENT

**101-5.1** Payment will be made at the contract unit price for each
completed and accepted job. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary to complete this item.

Payment will be made under:

Item L-101-5.1 Airport Rotating Beacon, in place---per unit

MATERIAL REQUIREMENTS

AC 150/5345-7 Specification for L-824 Underground Cable for Airport
Lighting Circuits

AC 150/5345-12 Specification for Airport and Heliport Beacons

FED SPEC J-C-30 Cable and Wire, Electrical (Power, Fixed Installation)

> (cancelled; replaced by A-A-59544 Cable and Wire, Electrical
>
> (Power, Fixed Installation))

FED SPEC TT-E-489 Enamel, Alkyd, Gloss, Low VOC Content

FED SPEC TT-P-664D Primer Coating, Alkyd, Corrosion-Inhibiting, Lead and
Chromate Free, VOC-Compliant

FED SPEC W-P-115 Panel, Power Distribution

FED STD 595 Colors Used in Government Procurement

MIL-P-24441/19B Paint, Epoxy-Polyamide, Zinc Primer, Formula 159, Type
III

Underwriters Laboratories Standard 6 Rigid Metal Conduit

Underwriters Laboratories Standard 514 Fittings for Conduit and Outlet
Boxes

Underwriters Laboratories Standard 1242 Intermediate Metal Conduit

NFPA-70 National Electric Code

NFPA-780 Standard for the Installation of Lightning Protection Systems

Master Painter's Institute

**END OF ITEM L-101**

**Intentionally Left Blank**

### **ITEM L-102 HAZARD BEACON**

DESCRIPTION

**102-1.1** This item shall consist of furnishing and installing a
hazard flashing beacon in accordance with these specifications. This
work shall include the mounting, leveling, wiring, servicing, painting,
and testing of the beacon and all materials and incidentals necessary to
place it in operating condition as a completed unit to the satisfaction
of the Engineer. This item shall include a mounting platform if
specified in the plans.

EQUIPMENT AND MATERIALS

**102-2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be certified and
listed under Advisory Circular (AC) 150/5345-53, Airport Lighting
Equipment Certification Program.

**b.** All other equipment and materials covered by other referenced
specifications shall be subject to acceptance through manufacturer\'s
certification of compliance with the applicable specification, when
requested by the Engineer.

**c.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**102-2. BEACON.** The beacon shall conform to the requirements of AC
150/5345-43, Specification for Obstruction Lighting Equipment.

**102-2.3 PANEL BOARDS AND BREAKERS.** Panel boards and breakers shall
conform to the requirements of Fed. Spec. W-P-115.

**102-2.4 WEATHERPROOF CABINETS.** Weatherproof cabinets shall conform
to National Electrical Manufacturers Association Standards and shall be
constructed of steel not less than No. 16 USS gauge.

**102-2.5 WIRE.** Wire in conduit rated up to 5,000 volts shall conform
to AC 150/5345-7, Specification for L-824 Underground Electrical Cable
for Airport Lighting Circuits for Rubber Insulated Neoprene Covered
Wire, or Fed. Spec. J-C 30, Type RHW, for rubber insulated fibrous
covered wire. For ratings up to 600 volts, thermoplastic wire conforming
to Fed. Spec. J-C-30, Types TW, THW, and THWN shall be used. The wires
shall be of the type, size, number of conductors, and voltage shown in
the plans or in the proposal.

**102-2.6 CONDUIT.** Rigid steel conduit and fittings shall conform to
the requirements of Underwriters Laboratories Standard 6, 514, and 1242.

**102-2.7 PAINT**

**a.** Priming paint for ungalvanized metal surfaces shall be a high
solids alkyd primer conforming to TT‑P‑664D.

**b.** Priming paint for galvanized metal surfaces shall be zinc
dust-zinc oxide primer paint, conforming to MIL--DTL-24441/19B. If
necessary, add not more than ½ pint (0.06 liters) of turpentine to each
gallon (liter).

**c.** Orange paint for the body and the finish coats on metal and wood
surfaces shall consist of a ready-mixed non-fading paint meeting the
requirements of Fed. Spec. TT-E-489. The color shall be in accordance
with Federal Standards 595, Aviation Gloss Orange Number 12197.

**d.** White paint for body and finish coats on metal and wood surfaces
shall be ready-mixed paint conforming to the Master Painter's Institute,
Reference #9, Exterior Alkyd, Gloss, VOC Range E2.

**e.** Priming paint for wood surfaces shall be mixed on the job by
thinning the above specified orange or white paint by adding ½ pint
(0.06 liters) of raw linseed oil to each gallon (liter).

**102-2.8 FLASHER.** The beacon flasher shall be a standard commercially
available unit designed for the service intended. The mechanism in the
flasher shall be designed to flash not more than 40 and not less than 12
flashes per minute. The flashing switch shall be of the mercury
contact-type encapsulated in nonbreakable plastic. The entire unit shall
be housed in a weatherproof cabinet.

CONSTRUCTION METHODS

**102-3.1 PLACING THE BEACON.** The beacon shall be mounted on a beacon
tower, platform, building roof, or on a pole as shown in the plans.

**102-3.2 MOUNTING AND LEVELING.** The support to which the beacon is
fastened shall be accurately leveled before mounting the beacon.

**102-3.3 FLASHER.** If shown in plans or specified in job
specifications, a separate flashing mechanism for the beacon shall be
installed adjacent or near the beacon. The mechanism in this flasher
shall be designed to flash not more than 40 and not less than 12 flashes
per minute.

**102-3.4 MOUNTING PLATFORM.** If shown in plans or specified in job
specifications, the Contractor shall construct a special mounting
platform for the beacon, flasher, and incidental equipment. Design and
materials for the special platform shall be as shown in the plans. This
mounting platform may be constructed on top of a steel beacon tower, or
wood pole if specified, and shall be as shown in the plans.

**102-3.5 WIRING.** The Contractor shall furnish all necessary labor and
materials and shall make complete aboveground electrical connections in
accordance with the wiring diagram furnished with the project plans. The
electrical installation shall conform to the requirements of the latest
edition of National Fire Protection Association, NFPA-70, National
Electric Code.

If underground cable for the power feed from the transformer vault to
the beacon site and duct for the installation of this cable is required,
the cable, ground rods and duct shall be installed in accordance with
and paid for as described in Item L-108, Underground Power Cable for
Airports, and Item L-110, Airport Underground Electrical Duct Banks and
Conduit.

If lightning protection is specified in the plans or proposals as a part
of this item, it shall be in accordance with Item L-103, Airport Beacon
Towers, paragraphs 103-2.3.

**102-3.6 PANEL AND CABINET.** If shown in plans or specified in job
specifications, the Contractor shall furnish and install a circuit
breaker panel. The panel shall be of the type and rating indicated in
the plans, and it shall be mounted in a weatherproof cabinet. The
cabinet shall be located near the beacon or as directed by the Engineer.

**102-3.7 CONDUIT.** All exposed wiring shall be run in not less than ¾
inch (19 mm) galvanized rigid steel conduit. No conduit shall be
installed on top of a beacon platform floor. All conduit shall be
installed to provide for drainage. If mounted on a steel beacon tower,
the conduit shall be fastened to the tower members with "wraplock"
straps, clamps, or approved fasteners spaced approximately 5 feet (150
cm) apart. Conduit shall be attached to wooden structures with
galvanized pipe straps and fastened with galvanized wood screws not less
than No. 8 or less than 1‑¼ inches (31 mm) long. There shall be at least
two fastenings for each 10-foot (3 m) length.

**102-3.8 BOOSTER TRANSFORMERS.** If shown in plans or specified in job
specifications, a booster transformer to compensate for voltage drop to
the beacon shall be installed in a suitable weatherproof housing under
or on the tower platform or at the base of the tower or pole. The
installation shall be as indicated in the plans and described in the
proposal. If the booster transformer is required for installation
remotely from the beacon, it shall be installed in accordance with and
paid for \[ \].

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify how the booster transformer will be paid
> for when located remotely from the beacon tower, i.e. as part of the
> beacon installation or, if installed in the vault, as part of the
> vault equipment.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**102-3.9 PHOTOELECTRIC CONTROL.** If shown in plans or specified in job
specifications, the Contractor shall furnish and install an automatic
control switch at the location indicated in the plans. This switch shall
be a photoelectric type. It shall be a standard commercially available
unit that will energize when the northern sky illuminance falls below 60
footcandles (645.8 lux) but before reaching a level of 35 footcandles
(367.7 lux). The photoelectric switch should de-energize when the
northern sky illuminance rises to a level of not more than 60
footcandles (645.9 lux). It shall be installed, connected, and adjusted
in accordance with the manufacturer\'s instruction.

**102-3.10 PAINTING.** Wood poles and wooden parts of mounting platforms
shall be given one priming coat of white or aviation-orange paint after
fabrication but before erection and one body and one finish coat of
aviation-orange paint after erection. Steel mounting platforms shall be
given one priming coat of corrosion‑inhibiting primer before erection
and one body and one finish coat of aviation-orange paint after
erection. All equipment under this contract and exposed to the weather
shall be given one body and one finish coat of aviation-orange or white
paint as required. This shall include beacon (except glass surfaces),
breaker cabinet, and all conduit and transformer cases. It shall not
include air terminals.

The paint shall be applied uniformly in the proper consistency by
skilled painters. The finished paint shall be free from sags, holidays,
and smears. Each coat of paint shall be given ample time to dry and
harden before the next coat of paint is applied. A minimum of 3 days
shall be allowed for drying on wood surfaces and a minimum of 4 days
shall be allowed for drying on metal surfaces. Painting shall not be
done in cold, damp, foggy, dusty, or frosty atmospheres, or when air
temperature is below 40º F (4º C), nor started when the weather forecast
indicates such conditions for the day.

All surfaces shall be cleaned before painting. The surfaces shall be dry
and free from scale, grease, rust, dust, and dirt when paint is applied.
All knots in wood surfaces shall be covered with shellac immediately
before applying the priming coat of paint. Nail holes and permissible
imperfections shall be filled with putty.

The ready-mixed paint shall be thinned for the priming and body coats in
accordance with the manufacturer\'s recommendations. In the absence of
such recommendations, the following shall apply:

**a.** Body coats (for both wood and steel surfaces) - add ½ pint (0.06
liters) of turpentine to each gallon (liter) of ready-mixed paint for
body coats.

**b.** Finish coats (for both wood and steel surfaces) - the ready-mixed
paint shall be used as it comes from the container for finish coats.

**102-3.11 TESTING.** The installation shall be tested in operation as a
completed unit prior to acceptance. Tests shall include taking megger
and voltage readings. The voltage tolerance for testing shall be as
specified by the beacon manufacturer. Testing equipment shall be
furnished by the Contractor. The insulation resistance to ground of the
beacon supply circuit shall be not less than 50 megohms when measured
ungrounded.

Tests shall be conducted in the presence of the Engineer and shall be to
the Engineer's satisfaction.

METHOD OF MEASUREMENT

**102-4.1** The quantity to be paid for shall be the number of beacons
installed as completed units in place, accepted, and ready for
operation.

BASIS OF PAYMENT

**102-5.1** Payment will be made at the contract unit price for each
completed and accepted job. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary to complete this item.

Payment will be made under:

Item L-102-5.1 Hazard Beacon, in place---per unit

MATERIAL REQUIREMENTS

AC 150/5345-7 Specification For L-824 for Underground Electrical Cable
for Airport Lighting Circuits

AC 150/5345-43 Specification for Obstruction Lighting Equipment

FED SPEC J-C-30 Cable and Wire, Electrical (Power, Fixed Installation)
(cancelled; replaced by AA-59544 Cable and Wire, Electrical (Power,
Fixed Installation))

FED SPEC TT-E-489 Enamel, Alkyd, Gloss, Low VOC Content

FED SPEC TT-P-664D Primer Coating, Alkyd, Corrosion-Inhibiting, Lead and
Chromate Free, VOC-Compliant

MIL-DTL-24441/19B Paint, Epoxy-Polyamide, Zinc Primer, Formula 159, Type
III

FED SPEC W-P-115 Panel, Power Distribution

FED STD 595 Colors Used in Government Procurement

Underwriters Rigid Metal Conduit

Laboratories

Standard 6

Underwriters Fittings for Conduit and Outlet Boxes

Laboratories

Standard 514

Underwriters Intermediate Metal Conduit

Laboratories

Standard 1242

NFPA-70 National Electric Code

NFPA-780 Standard for the Installation of Lightning Protection Systems

Master Painter's Institute

# END OF ITEM L-102 {#end-of-item-l-102 .Style1}

**Intentionally Left Blank**

### **ITEM L-103 AIRPORT BEACON TOWERS**

DESCRIPTION

**103-1.1** This item shall consist of furnishing and installing an
airport beacon tower of the type shown in the plans, in accordance with
these specifications. This work shall include the clearing of the site,
erection of the tower, installation of lightning protection, painting,
and all incidentals necessary to place it in operating condition as a
completed unit to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

**103-2.1 GENERAL.**

**a.** All equipment and materials covered by referenced specifications
shall be subject to acceptance through manufacturer\'s certification of
compliance with the applicable specification when requested by the
Engineer.

**b.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**c.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**d.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**e.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**103-2.2 TOWER.** The beacon tower shall conform to the requirements of
Advisory Circular (AC) 150/5340-30, Design and Installation Details for
Airport Visual Aids, Chapter 6.

**103-2.3 LIGHTNING PROTECTION**. Lightning protection shall comply with
NFPA-780, Standard for the Installation of Lightning Protection Systems.
All materials shall comply with Class II requirements regardless of
tower height. Ground rods and underground cables shall be installed in
accordance with and paid for as described in Item L-108, Underground
Power Cable for Airports.

**103-2.4 PAINT.**

**a.** Priming paint for galvanized steel towers shall be zinc dust-zinc
oxide primer paint conforming to MIL-DTL-24441/19B. If necessary, add
not more than 1/2 pint (0.06 liter) of turpentine to each gallon
(liter).

**b.** Priming paint for ungalvanized steel towers shall be a high
solids alkyd primer conforming to the Master Painter's Institute,
Reference #9, Exterior Alkyd, Gloss, VOC Range E2.

**c.** Orange paint for the body and finished coats on metal and wood
surfaces shall consist of a ready-mixed non-fading paint meeting the
requirements of Fed. Spec. TT-E-489. The color shall be in accordance
with Federal Standard 595, Aviation Gloss Orange Number 12197.

**d.** White paint for steel tower shall be ready-mixed paint conforming
to Commercial Item Description A‑A‑3067.

# 

CONSTRUCTION METHODS

**103-3.1 CLEARING AND GRADING.** The site on which the beacon tower is
to be erected shall be cleared and leveled. All trees and brush shall be
removed from the area within a distance of 25 feet (7.5 m) from the
tower or as called for in the plans. Stumps shall be removed to a depth
of 18 inches (45 cm) below finished grade and the excavation filled with
earth and tamped. If a transformer vault or other structure is included
as part of the installation, the area shall be cleared to a distance of
25 feet (7.5 m) from these structures. The ground near the tower shall
be leveled to permit the operation of mowing machines. The leveling
shall extend at least 2 feet (60 cm) outside the tower legs.  All debris
removed from the tower site shall be disposed of by the Contractor to
the satisfaction of the Engineer and in accordance with Federal, state,
or local regulations.

**103-3.2 EXCAVATION AND FILL.** Excavation for the tower footings shall
be carried to a minimum of 4 inches (100 mm) below the footing depth.
The excess excavation below the footing depth shall then be backfilled
with gravel or crushed stone and compacted to the required level. The
footing plates shall be installed, and a thickness of not less than 18
inches (45 cm) of the same gravel or crushed stone shall be placed
immediately above the footing plates in layers of not over 6 inches (150
mm). Each layer above the footing plates shall be thoroughly tamped in
place. The remainder of the backfill may be of excavated earth placed in
layers not to exceed 6 inches (150 mm). Each layer shall be thoroughly
compacted by tamping.

Where solid rock is encountered, which prevents the carrying of the
foundation legs to the required depth but which is of sufficient
strength to use holddown bolts, the tower anchor posts shall be cut off
at the required length and the holddown bolts shall be installed as
indicated in the plans with the approval of the Engineer. Each tower leg
shall be anchored to the rock by means of two 7/8-inch (21 mm) diameter
by 3-foot (90 cm) long expansion or split bolts and shall be grouted
with neat portland cement into holes drilled into the natural rock.
Except as required for rock foundations, the footing members shall not
be cut off or shortened. If excavated material is of such character that
it will not readily compact when backfilled, the Engineer may order the
excavation backfilled with concrete or other suitable material.

The concrete footing for tubular beacon towers shall be installed in
accordance with the manufacturer\'s recommendations. Portions of the
footing in the topsoil layer shall not be included in the footing
height.

**103-3.3 ERECTION.** Detail erection drawings furnished by the
manufacturer shall be strictly followed during construction. All towers
shall be erected in sections from the ground up unless otherwise
specified. In final assembly, all bolts and fastenings shall be
installed, and the structure shall be plumb, true, square, and level.
Nuts shall be taken up to a firm bearing after which the bolts shall, if
necessary, be cut to proper length to protrude three full threads.
Approved locknuts shall be placed on each bolt over the regular nut.
Ladder bolts shall be inserted with the head to the outer face of the
tower. Diagonal, leg, and handrail bolts shall be installed with nuts on
the outer face of the tower, unless otherwise specified. Bent parts
shall be straightened before erection without damage to the protective
coating. Surfaces abraded or bared of protective coating shall be
painted with the proper priming paint as specified in these
specifications.

The Contractor shall install the ladder on the side of the tower
adjacent to the driveway or most accessible approach to the tower.
Tubular beacon towers shall be erected in accordance with the
manufacturer\'s recommendations. The safety cable shall be located on
the side of the tower adjacent to the driveway or most accessible
approach to the tower.

**103-3.4 LIGHTNING PROTECTION.** The Contractor shall furnish and
install an air terminal, down conductor, and at least one ground plate
or rod for each beacon tower or as indicated in the plans. The air
terminal shall be installed at the top of the tower with the tip of the
rod extending not less than 6 inches (150 mm) above the top of the
beacon.

Down-conductor cables shall be securely fastened to the surface of the
tower leg at 5-foot (150 cm) intervals with suitable bronze fasteners
having bronze or noncorrosive metal bolts. Sharp turns or bends in the
down conductor will not be permitted.

All connections of cable to cable, cable to air terminals, and cable to
ground plates or rods shall be made with solderless connectors or
noncorrosive metal approved by the engineer and shall be of substantial
construction.

The down-conductor cable shall be securely attached to ground rods or
plates placed at least 2 feet (60 cm) away from the tower foundations.
The ground rod shall be driven into the ground so that the top is at
least 6 inches (150 mm) below grade. The down-conductor shall be firmly
attached to the ground plate or rod by means of a ground connector or
clamp. Plates shall be embedded in the area of permanent moisture.

The complete lightning protection installation shall be accomplished to
the satisfaction of the Engineer. The resistance to ground of any part
of the lightning protection system shall not exceed 25 ohms.

**103-3.5 PAINTING.** The Contractor shall furnish all materials and
labor for painting the beacon tower. The color scheme for the steel
tower shall be as shown in the plans.

**a. Parts to be Painted.** Tower parts (except those parts to be
exposed to earth) shall not be treated or primed before erection. All
tower parts placed below ground level or within 12 inches (300 mm) above
ground level shall be given two coats of approved bituminous paint.

The paint shall be applied uniformly in the proper consistency by
skilled painters. The finished paint shall be free from sags, holidays,
and smears. Division lines between colors shall be sharply defined. Each
coat of paint shall be given ample time to dry and harden before the
next coat is applied. A minimum of 4 days shall be allowed for drying on
metal surfaces. Painting shall not be done in cold, damp, foggy, dusty,
or frosty atmospheres, or when air temperature is below 40º F (4º C),
nor started when the weather forecast indicates such conditions for the
day.

All surfaces shall be cleaned before painting. The surfaces shall be dry
and free from scale, grease, rust, dust, and dirt when paint is applied.

The number of coats of paint applied shall be in accordance with the
following instructions:

**b. Steel Towers, Galvanized.** One priming coat of zinc dust-zinc
oxide primer after erection and one body and one finish of white or
orange paint (as required by the color scheme) shall be applied after
erection.

**c. Steel Towers, Not Galvanized.** One priming coat of
corrosion‑inhibiting primer and one body and one finish coat of white or
orange paint (as required by the color scheme) shall be applied after
erection.

The above specified orange and white ready-mixed paints shall be thinned
for the body coats in accordance with the manufacturer\'s
recommendations. In the absence of such recommendations, the following
shall apply:

**d. Body Coats.** Add not more than 1/2 pint (0.06 liters) of
turpentine to each gallon (liter) of ready-mixed paint for body coats.

**e. Finish Coats.** The ready-mixed paint shall be used as it comes
from the container for finish coats.

METHOD OF MEASUREMENT

**103-4.1** The quantity to be paid for under this item shall be the
number of airport beacon towers installed as completed units in place,
accepted, and ready for operation.

BASIS OF PAYMENT

**103 5.1** Payment will be made at the contract unit price for each
completed and accepted job. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary to complete this item.

Payment will be made under:

Item L‑103‑5.1 Beacon Tower, in place-per unit

MATERIAL REQUIREMENTS

AC 150/5340‑30 Design and Installation Details for Airport Visual Aids

FED SPEC TT-E-489 Enamel, Alkyd, Gloss, Low VOC Content

FED STD 595 Colors Used in Government Procurement

MIL-DTL-24441/19B Paint, Epoxy-Polyamide, Zinc Primer, Formula 159, Type
III

NFPA-780 Standard for the Installation of Lightning Protection Systems

Master Painter's Institute

**END OF ITEM L-103**

### **ITEM L-107 AIRPORT 8-FOOT AND 12-FOOT WIND CONES**

DESCRIPTION

**107-1.1** This item shall consist of furnishing and installing an
airport wind cone in accordance with these specifications and in
accordance with the dimensions, design, and details shown in the plans.

The work shall include the furnishing and installation of a support for
mounting the wind cone, the specified wire, and a concrete foundation.
The item shall also include all cable connections, conduit and conduit
fittings, the furnishing and installation of all lamps, ground rod and
ground connection, the testing of the installation, and all incidentals
necessary to place the wind cone in operation as a completed unit to the
satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

**107-2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be certified and
listed under Advisory Circular (AC***)*** 150/5345-53, Airport Lighting
Equipment Certification Program.

**b.** All other equipment and materials covered by other referenced
specifications shall be subject to acceptance through manufacturer's
certification of compliance with the applicable specification when
requested by the Engineer.

**c.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**107-2.2 WIND CONES.** The 8-foot (240 cm) and 12-foot (3.5 m) wind
cones and assemblies shall conform to the requirements of AC
150/5345-27, Specification for Wind Cone Assemblies.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The illuminated windcone must present a constant brightness to the
> pilot. As a result, the source of power for the windcone circuit must
> be identified. Where a constant voltage is available, the windcone may
> be connected directly to the constant voltage circuit. Where the
> series lighting circuit is used as a power source to the windcone, a
> power adapter that converts constant current to constant voltage must
> be specified. An additional requirement for the power adapter is the
> output voltage must remain constant regardless of the input current.
> The manufacturer of the power adapter must be consulted to verify the
> additional load imposed on the series circuit by the power adapter.**
>
> **The engineer should specify the windcone and power adapter
> combination recommended by the manufacturer when the power source for
> the windcone circuit will be the constant current series lighting
> circuit.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**107-2.3 WIRE.** Wire in conduit rated up to 5,000 volts shall conform
to AC 150/5345-7, Specification for L-824 Underground Cable for Airport
Lighting Circuits for Rubber Insulated Neoprene Covered Wire, or Fed.
Spec. J-C-30, Type RHW, for rubber insulated fibrous covered wire. For
ratings up to 600 volts, thermoplastic wire conforming to Fed. Spec.
J-C-30, Types TW, THW, and THWN, shall be used. The wires shall be of
the type, size, number of conductors, and voltage shown in the plans or
in the proposal.

**107-2.4 CONDUIT.** Rigid steel conduit and fittings shall conform to
the requirements of Underwriters Laboratories Standard 6, 514, and 1242.

**107-2.5 PLASTIC CONDUIT (for use below grade only).** Plastic conduit
and fittings-shall conform to the requirements of Fed. Spec. W\--C-1094
and Underwriters Laboratories Standards UL-651 and shall be one of the
following, as shown in the plans:

**a.** Type I--Schedule 40 PVC suitable for underground use either
direct-buried or encased in concrete.

**b.** Type II--Schedule 40 PVC suitable for either above ground or
underground use.

Plastic conduit adhesive shall be a solvent cement manufactured
specifically for the purpose of gluing the specific type of plastic
conduit and fitting.

**107-2.6 CONCRETE.** The concrete for foundations shall be
proportioned, placed, and cured in accordance with Item P-610,
Structural Portland Cement Concrete.

**107-2.7 PAINT.**

**a.** Priming paint for ungalvanized metal surfaces shall be a high
solids alkyd primer conforming to TT‑P‑664D.

**b.** Priming paint for galvanized metal surfaces shall be zinc
dust‑zinc oxide primer paint conforming to MIL-DTL-24441/19B. If
necessary, add not more than ½ pint (0.06 liter) of turpentine to each
gallon (liter).

**c.** Orange paint for the body and the finish coats on metal and wood
surfaces shall consist of a ready-mixed non-fading paint meeting the
requirements of Fed. Spec. TT-E-489. The color shall be in accordance
with Federal Standards 595, Aviation Gloss Orange Number 12197.

**d.** White paint for body and finish coats on metal and wood surfaces
shall be ready-mixed paint conforming to the Master Painter's Institute,
Reference #9, Exterior Alkyd, Gloss, VOC Range E2.

**e.** Priming paint for wood surfaces shall be mixed on the job by
thinning the above specified aviation-orange or white paint by adding ½
pint (0.06 liter) of raw linseed oil to each gallon (liter).

CONSTRUCTION METHODS

**107-3.1 INSTALLATION.** The hinged support or hinged pole shall be
installed on a concrete foundation as shown in the plans.

**107-3.2 POLE ERECTION.** The Contractor shall erect the pole on the
foundation following the manufacturer's requirements and erection
details. The pole shall be level and secure.

**107-3.3 ELECTRICAL CONNECTION.** The Contractor shall furnish all
labor and materials and shall make complete electrical connections in
accordance with the wiring diagram furnished with the project plans. The
electrical installation shall conform to the requirements of the latest
edition of National Fire Protection Association, NFPA-70, National
Electric Code.

If underground cable from the transformer vault to the wind cone site
and duct for this cable installation is required, the cable and duct
shall be installed in accordance with and paid for as described in Item
L-108, Underground Power Cables for Airports, and Item L-110, Airport
Underground Electrical Duct Banks and Conduits.

**107-3.4 BOOSTER TRANSFORMER.** If shown in plans or specified in job
specifications, a booster transformer to compensate for voltage drop to
the lamps shall be installed in a suitable weatherproof housing. The
booster transformer shall be installed as indicated in the plans and
described in the proposal. If the booster transformer is required for
installation remotely from the windcone, it shall be installed in
accordance with and paid for \[ \].

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify how the booster transformer will be paid
> for when located remotely from the windcone, i.e. as part of the
> windcone installation or, if installed in the vault, as part of the
> vault equipment.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**107-3.5 GROUND CONNECTION AND GROUND ROD.** The Contractor shall
furnish and install a ground rod, grounding cable, and ground clamps for
grounding the "A" frame of the 12-foot (3.5 m) assembly or pipe support
of the 8-foot (240 cm) support near the base. The ground rod shall be of
the type, diameter and length specified in Item L‑108, Underground Power
Cable for Airports. The ground rod shall be driven into the ground
adjacent to the concrete foundation (minimum distance from foundation of
2 feet) so that the top is at least 6 inches (150 mm) below grade. The
grounding cable shall consist of No. 4 AWG minima bare stranded copper
wire or larger and shall be firmly attached to the ground rod by
exothermic welding. The other end of the grounding cable shall be
securely attached to a leg of the frame or to the base of the pipe
support with non-corrosive metal and shall be of substantial
construction. The resistance to ground shall not exceed 25 ohms.

**107-3.6 PAINTING.** Three coats of paint shall be applied (one prime,
one body, and one finish) to all exposed material installed under this
item except the fabric cone, obstruction light globe, and lamp
reflectors. The wind cone assembly, if painted on receipt, shall be
given one finish coat of paint in lieu of the three coats specified
above. The paint shall meet the requirements of Fed. Spec. TT-E-489. The
color shall be in accordance with Federal Standard 595, Aviation Gloss
Orange Number 12197.

**107-3.7 LAMPS.** The Contractor shall furnish and install lamps as
specified by the manufacturer.

**107-3.8 CHAIN AND PADLOCK.** The Contractor shall furnish and install
a suitable operating chain for lowering and raising the hinged top
section. The chain shall be attached to the pole support in a manner to
prevent the light fixture assembly from striking the ground in the
lowered position.

A padlock shall also be furnished by the Contractor on the 8-foot (240
cm) wind cone for securing the hinged top section to the fixed lower
section. Keys for the padlock shall be delivered to the Engineer.

METHOD OF MEASUREMENT

**107-4.1** The quantity to be paid for shall be the number of wind
cones installed as completed units in place, accepted, and ready for
operation.

BASIS OF PAYMENT

**107-5.1** Payment will be made at the contract unit price for each
completed and accepted job. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary to complete this item.

Payment will be made under:

Item L‑107‑5.1 12‑Foot (3.5 m) Wind Cone, in place---per unit 

Item L‑107‑5.2 8‑Foot (240 cm) Wind Cone, in place---per unit

MATERIAL REQUIREMENTS

AC 150/5345-7 Specification for L-824 Underground Cable for Airport
Lighting Circuits

AC 150/5345-27 Specification for Wind Cone Assemblies

FED SPEC TT-E-489 Enamel, Alkyd, Gloss, Low VOC Content

FED SPEC J-C-30 Cable and Wire, Electrical (Power, Fixed Installation)
(cancelled; replaced by AA-59544 Cable and Wire, Electrical (Power,
Fixed Installation))

FED SPEC W-P-115 Panel, Power Distribution

FED STD 595 Colors Used in Government Procurement

MIL-DTL-24441/20 Paint, Epoxy-Polyamide, Green Primer, Formula 150, Type
III

Underwriters Laboratories Rigid Metal Conduit

Standard 6

Underwriters Laboratories Fittings For Conduit and Outlet Boxes

Standard 514

Underwriters Laboratories Intermediate Metal Conduit

Standard 1242

NFPA-70 National Electric Code

Master Painter's Institute

**END OF ITEM L-107**

### **ITEM L‑108 UNDERGROUND POWER CABLE FOR AIRPORTS**

DESCRIPTION

**108‑1.1** This item shall consist of furnishing and installing power
cables direct buried and furnishing and/or installing power cables
within conduit or duct banks in accordance with these specifications at
the locations shown on the plans. It includes excavation and backfill of
trench for direct-buried cables only. Also included are the installation
of counterpoise wires, ground wires, ground rods and connections, cable
splicing, cable marking, cable testing, and all incidentals necessary to
place the cable in operating condition as a completed unit to the
satisfaction of the Engineer. This item shall not include the
installation of duct banks or conduit, trenching and backfilling for
duct banks or conduit, or furnishing or installation of any cable for
FAA facilities. Requirements and payment for trenching and backfilling
for the installation of underground conduit and duct banks is covered
under Item L-110 "Airport Underground Electrical Duct Banks and
Conduits."

EQUIPMENT AND MATERIALS

**108‑2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be approved under the
Airport Lighting Equipment Certification Program described in Advisory
Circular (AC) 150/5345-53, current version.

**b.** All other equipment and materials covered by other referenced
specifications shall be subject to acceptance through manufacturer\'s
certification of compliance with the applicable specification, when
requested by the Engineer.

**c.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner. The Contractor shall be responsible to maintain an insulation
resistance of 50 megohms minima, (1000V megger) with isolation
transformers connected in new circuits and new segments of existing
circuits through the end of the contract warranty period.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**108‑2.2 CABLE.** Underground cable for airfield lighting facilities
(runway and taxiway lights and signs) shall conform to the requirements
of AC 150/5345‑7, Specification for L‑824 Underground Electrical Cable
for Airport Lighting Circuits. Conductor sizes noted above shall not
apply to leads furnished by manufacturers on airfield lighting
transformers and fixtures.

Wire for electrical circuits up to 600 volts shall comply with
Specification L-824 and/or Federal Specification J-C-30 and shall be
type THWN-2.

Cable type, size, number of conductors, strand and service voltage shall
be as specified on the plans.

**108‑2.3 BARE COPPER WIRE (COUNTERPOISE OR GROUND) AND GROUND RODS.**
Wire for counterpoise or ground installations for airfield lighting
systems shall be No. 6 AWG solid for counterpoise and or No. 6 AWG
stranded for ground wire conforming to ASTM B 3 and ASTM B 8, and shall
be **\[bare copper wire\] \[tinned copper\]** conforming to the
requirements of ASTM D 33.

Ground rods shall be **\[solid stainless steel\] \[copper\] or
\[copper-clad steel\]**. The ground rods shall be of the length and
diameter specified on the plans, but in no case shall they be less than
8‑feet (240 cm) long nor less than 5/8 inch (15 mm) in diameter.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer should evaluate the soils in the vicinity of proposed
> counterpoise and ground rod installations and determine if soil
> conditions would adversely affect copper. Engineer shall specify the
> type of ground rod and counterpoise wire to be installed in
> consideration of the soil conditions. If tinned copper counterpoise or
> ground wire is specified, include requirement for UL listing.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**108‑2.4 CABLE CONNECTIONS.** In‑line connections of underground
primary cables shall be of the type called for on the plans, and shall
be one of the types listed below. No separate payment will be made for
cable connections.

**a. The Cast Splice.** A cast splice, employing a plastic mold and
using epoxy resin equivalent to that manufactured by Minnesota Mining
and Manufacturing Company, "Scotchcast" Kit No. 82‑‑B, or as
manufactured by Hysol Corporation, "Hyseal Epoxy Splice" Kit No. E1135,
or equivalent, is used for potting the splice is acceptable.

**b. The Field‑attached Plug‑in Splice.** Figure 3 of AC 150/5345‑26,
Specification for L‑823 Plug and Receptacle, Cable Connectors, employing
connector kits, is acceptable for field attachment to single conductor
cable. It shall be the Contractor's responsibility to determine the
outside diameter of the cable to be spliced and to furnish appropriately
sized connector kits and/or adapters and heat shrink tubing with
integral sealant.

**c. The Factory‑Molded Plug‑in Splice.** Specification for L‑823
Connectors, Factory‑Molded to Individual Conductors, is acceptable.

**d. The Taped or Heat-Shrinked Splice.** Taped splices employing
field‑applied rubber, or synthetic rubber tape covered with plastic tape
is acceptable. The rubber tape should meet the requirements of ASTM D
4388 and the plastic tape should comply with Mil Spec. MIL-I-24391or
Fed. Spec. A-A-55809. Heat shrinkable tubing shall be heavy-wall,
self-sealing tubing rated for the voltage of the wire being spliced and
suitable for direct-buried installations. The tubing shall be factory
coated with a thermoplastic adhesive-sealant that will adhere to the
insulation of the wire being spliced forming a moisture- and dirt-proof
seal. Additionally, heat shrinkable tubing for multi-conductor cables,
shielded cables, and armored cables shall be factory kits designed for
the application. Heat shrinkable tubing and tubing kits shall be
manufactured by Tyco Electronics/ Raychem Corporation, Energy Division,
or approved equivalent.

**e.** In all the above cases, connections of cable conductors shall be
made using crimp connectors utilizing a crimping tool designed to make a
complete crimp before the tool can be removed. All L-823/L-824 splices
and terminations shall be made in accordance with the manufacturer's
recommendations and listings.

**f.** All connections of counterpoise, grounding conductors and ground
rods shall be made by the exothermic process or approved equivalent,
except the base can ground clamp connector shall be used for attachment
to the base can. All exothermic connections shall be made in accordance
with the manufacturer's recommendations and listings.

**108-2.5 SPLICER QUALIFICATIONS.** Every airfield lighting cable
splicer shall be qualified in making cable splices and terminations on
cables rated above 5,000 volts AC. The Contractor shall submit to the
Engineer proof of the qualifications of each proposed cable splicer for
the cable type and voltage level to be worked on. Cable
splicing/terminating personnel shall have a minimum of three (3) years
continuous experience in terminating/splicing medium voltage cable.

**108‑2.6 CONCRETE.** Concrete for cable markers shall conform to
Specification Item P‑610, \`\`Structural Portland Cement Concrete.\'\'

# 

**108-2.7 FLOWABLE BACKFILL.** Flowable material used to backfill
trenches for power cable trenches shall conform to the requirements of
Item P-153 "Controlled Low Strength Material".

**108-2.8 CABLE IDENTIFICATION TAGS.** Cable identification tags shall
by made from a non-corrosive material with the circuit identification
stamped or etched onto the tag. The tags shall be of the type as
detailed on the plans.

**108-2.9 TAPE.** Electrical tapes shall be Scotch Electrical Tapes --
number Scotch 88 (1-1/2" wide) and Scotch 130C linerless rubber splicing
tape (2" wide), as manufactured by the Minnesota Mining and
Manufacturing Company, or approved equivalent.

**108-2.10 ELECTRICAL COATING.** Scotchkote shall be as manufactured by
Minnesota Mining and Manufacturing Company, or approved equivalent.

**108-2.11 EXISTING CIRCUITS.** Whenever the scope of work requires,
connection to an existing circuit, the circuit's insulation resistance
shall be tested, in the presence of the Engineer. The test shall be
performed in accordance with this item and prior to any activity
affecting the respective circuit. The Contractor shall record the
results on forms acceptable to the engineer. When the work affecting the
circuit is complete, the circuit's insulation resistance shall be
checked again, in the presence of the Engineer. The Contractor shall
record the results on forms acceptable to the engineer. The second
reading shall be equal to or greater than the first reading or the
Contractor shall make the necessary repairs to the circuit to bring the
second reading above the first reading. All repair costs including a
complete replacement of the L-823 connectors, L-830 transformers and
L-824 cable, if necessary, shall be borne by the Contractor. All test
results shall be submitted in the Operation and Maintenance (O&M)
Manual.

# 

CONSTRUCTION METHODS

**108‑3.1 GENERAL.** The Contractor shall install the specified cable at
the approximate locations indicated on the plans. Unless otherwise shown
on the plans, all cable required to cross under pavements expected to
carry aircraft loads shall be installed in concrete encased duct banks.
Wherever possible, cable shall be run without splices, from connection
to connection.

Cable connections between lights will be permitted only at the light
locations for connecting the underground cable to the primary leads of
the individual isolation transformers. The Contractor shall be
responsible for providing cable in continuous lengths for home runs or
other long cable runs without connections, unless otherwise authorized
in writing by the Engineer or shown on the plans.

In addition to connectors being installed at individual isolation
transformers, L-823 cable connectors for maintenance and test points
shall be installed at locations shown on the plans. Cable circuit
identification markers shall be installed on both sides of the L-823
connectors installed or at least once in each access point where L-823
connectors are not installed.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer should determine and specify on the plans an adequate
> number of locations for installing L-823 connectors to provide
> maintenance and test points.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

Provide not less than 3 feet of cable slack on each side of all
connections, isolation transformers, light units, and at points where
cable is connected to field equipment. Where provisions must be made for
testing or for future above grade connections, provide enough slack to
allow the cable to be extended at least one foot vertically above the
top of the access structure. This requirement also applies where primary
cable passes through empty base cans, junction and access structures to
allow for future connections, or as designated by the Engineer.

**108‑3.2 INSTALLATION IN DUCT BANKS OR CONDUITS.** This item includes
the installation of the cable in duct banks or conduit as described
below. The maximum number and voltage ratings of cables installed in
each single duct or conduit, and the current‑carrying capacity of each
cable shall be in accordance with the latest National Electric Code, or
the code of the local agency or authority having jurisdiction.

The Contractor shall make no connections or splices of any kind in
cables installed in conduits or duct banks.

Unless otherwise designated in the plans, where ducts are in tiers, use
the lowest ducts to receive the cable first, with spare ducts left in
the upper levels. Check duct routes prior to construction to obtain
assurance that the shortest routes are selected and interferences are
avoided.

Duct banks or conduits shall be installed as a separate item in
accordance with Item L‑110, \`\`Airport Underground Electrical Duct
Banks and Conduit.\'\' The Contractor shall run a mandrel through duct
banks or conduit prior to installation of cable to insure that the duct
bank or conduit is open, continuous and clear of debris. Mandrel size
shall be compatible with conduit size. The Contractor shall swab out all
conduits/ducts and clean base can, manhole, etc. interiors IMMEDIATELY
prior to pulling cable. Once cleaned and swabbed the base cans and all
accessible points of entry to the duct/conduit system shall be kept
closed except when installing cables. Cleaning of ducts, base cans,
manholes, etc. is incidental to the pay item of the item being cleaned.
All raceway systems left open, after initial cleaning, for any reason
shall be recleaned at the Contractor's expense. All accessible points
shall be kept closed when not installing cable. The Contractor shall
verify existing ducts proposed for use in this project as clear and
open. The Contractor shall notify the Engineer of any blockage in the
existing ducts. The cable shall be installed in a manner to prevent
harmful stretching of the conductor, injury to the insulation, or damage
to the outer protective covering. The ends of all cables shall be sealed
with moisture‑seal tape providing moisture-tight mechanical protection
with minimum bulk, or alternately, heat shrinkable tubing before pulling
into the conduit and it shall be left sealed until connections are made.
Where more than one cable is to be installed in a conduit, all cable
shall be pulled in the conduit at the same time. The pulling of a cable
through duct banks or conduits may be accomplished by handwinch or power
winch with the use of cable grips or pulling eyes. Maximum pulling
tensions shall be governed by cable manufacturer's recommendations. A
non-hardening lubricant recommended for the type of cable being
installed shall be used where pulling lubricant is required.

**\[Contractor shall submit pulling tension values to the Engineer prior
to any cable installation. If required by the Engineer, pulling tension
values for cable pulls shall be monitored by a dynamometer in the
presence of the Engineer. Cable pull tensions shall be recorded by the
Contractor and reviewed by the Engineer. Cables exceeding the maximum
allowable pulling tension values shall be removed and replaced by the
Contractor at the Contractor's expense.\]**

The manufacturer\'s minimum bend radius or the NEC requirements
whichever is more restrictive shall apply. Cable installation, handling
and storage shall be per manufacturer\'s recommendations. During cold
weather, particular attention shall be paid to the manufacturer\'s
minimum installation temperature. Cable shall not be installed when the
temperature is at or below the manufacturer\'s minimum installation
temperature. At the Contractor's option, the Contractor may submit a
plan, for review by the Engineer, for heated storage of the cable and
maintenance of an acceptable cable temperature during installation when
temperatures are below the manufacturer's minimum cable installation
temperature.

Cable shall not be dragged across base can or manhole edges, pavement or
earth. When cable must be coiled, lay cable out on a canvas tarp or
utilize other appropriate means to prevent abrasion to the cable jacket.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer may optionally add this language.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**108‑3.3 INSTALLATION OF DIRECT-BURIED CABLE IN TRENCHES.** Unless
otherwise specified, the Contractor shall not use a cable plow for
installing the cable. Cable(s) shall be unreeled uniformly in place
alongside or in the trench and shall be carefully placed along the
bottom of the trench. The cable(s) shall not be unreeled and pulled into
the trench from one end. Slack cable sufficient to provide strain relief
shall be placed in the trench in a series of S curves. Sharp bends or
kinks in the cable shall not be permitted.

Where cables must cross over each other, a minimum of 3‑inch vertical
displacement shall be provided with the topmost cable depth at or below
the minimum required depth below finished grade.

Primary airfield lighting cables installed shall have cable circuit
identification markers attached on both sides of each L-823 connector
and on each airport lighting cable entering or leaving cable access
points, such as manholes, handholes, pullboxes, junction boxes, etc.
Markers shall be of sufficient length for imprinting the cable circuit
identification legend on one line, using letters not less than ¼ inch in
size. The cable circuit identification shall match the circuits noted on
the construction plans.

**a. Trenching.** Where turf is well established and the sod can be
removed, it shall be carefully stripped and properly stored. Trenches
for cables may be excavated manually or with mechanical trenching
equipment. Walls of trenches shall be essentially vertical so that a
minimum of surface is disturbed. Graders shall not be used to excavate
the trench with their blades. The bottom surface of trenches shall be
essentially smooth and free from coarse aggregate. Unless otherwise
specified, cable trenches shall be excavated to a minimum depth of 18
inches below finished grade, except as follows:

> **(1)** When off the airport or crossing under a roadway or driveway,
> the minimum depth shall be 36 inches unless otherwise specified.
>
> **(2)** Minimum cable depth when crossing under a railroad track,
> shall be 42 inches unless otherwise specified.

Dewatering necessary for cable installation, erosion and turbidity
control, in accordance with Federal, State, and Local requirements is
incidental to its respective pay items as part of Item L-108. The cost
of all excavation regardless of type of material encountered, shall be
included in the unit price bid for the L-108 Item.

The Contractor shall excavate all cable trenches to a width not less
than 6 inches. Unless otherwise specified on the plans, all cables in
the same location and running in the same general direction shall be
installed in the same trench.

When rock is encountered, the rock shall be removed to a depth of at
least 3 inches below the required cable depth and it shall be replaced
with bedding material of earth or sand containing no mineral aggregate
particles that would be retained on a 1/4‑inch sieve. Flowable backfill
material may alternatively be used. The Contractor shall ascertain the
type of soil or rock to be excavated before bidding. All such rock
removal shall be performed and paid for under Item P-152.

Duct bank or conduit markers temporarily removed for trench excavations
shall be replaced as required.

It is the Contractor's responsibility to locate existing utilities
within the work area prior to excavation. Where existing active cable(s)
cross proposed installations, the Contractor shall insure that these
cable(s) are adequately protected. Where crossings are unavoidable, no
splices will be allowed in the existing cables, except as specified on
the plans. Installation of new cable where such crossings must occur
shall proceed as follows:

**(1)** Existing cables shall be located manually. Unearthed cables
shall be inspected to assure absolutely no damage has occurred.

**(2)** Trenching, etc., in cable areas shall then proceed, with
approval of the Engineer, with care taken to minimize possible damage or
disruption of existing cable, including careful backfilling in area of
cable.

In the event that any previously identified cable is damaged during the
course of construction, the Contractor shall be responsible for the
complete repair or replacement.

**b. Backfilling.** After the cable has been installed, the trench shall
be backfilled. The first layer of backfill in the trench shall be 3
inches deep, loose measurement, and shall be either earth or sand
containing no mineral aggregate particles that would be retained on a
1/4‑inch sieve. This layer shall not be compacted. The second layer
shall be 5 inches deep, loose measurement, and shall contain no
particles that would be retained on a 1‑inch sieve. The remaining 3^rd^
and subsequent layers of backfill shall not exceed 8 inches of loose
measurement and be excavated or imported material and shall not contain
stone or aggregate larger than 4 inches maximum diameter.

The second and subsequent layers shall be thoroughly tamped and
compacted to at least the density of the adjacent undisturbed soil, and
to the satisfaction of the Engineer. If necessary to obtain the desired
compaction, the backfill material shall be moistened or aerated as
required.

Trenches shall not contain pools of water during backfilling operations.
The trench shall be completely backfilled and tamped level with the
adjacent surface, except that when turf is to be established over the
trench, the backfilling shall be stopped at an appropriate depth
consistent with the type of turfing operation to be accommodated. A
proper allowance for settlement shall also be provided. Any excess
excavated material shall be removed and disposed of in accordance with
the plans and specifications.

Underground electrical warning (caution) tape shall be installed in the
trench above all direct-buried cable. Contractor shall submit a sample
of the proposed warning tape for acceptance by the Engineer. If not
shown on the plans, the warning tape shall be located six inches above
the direct-buried cable or the counterpoise wire if present. A 4-6 inch
wide polyethylene film detectable tape, with a metalized foil core,
shall be installed above all direct buried cable or counterpoise. The
tape shall be of the color and have a continuous legend as indicated on
the plans. The tape shall be installed 8 inches minimum below finished
grade.

**c. Restoration.** Where soil and sod has been removed, it shall be
replaced as soon as possible after the backfilling is completed. All
areas disturbed by work shall be restored to its original condition. The
restoration shall include the **\[sodding\]** **\[topsoiling\]
\[fertilizing\] \[liming\] \[seeding\] \[sprigging\] \[mulching\]** as
shown on the plans. The Contractor shall be held responsible for
maintaining all disturbed surfaces and replacements until final
acceptance. When trenching is through paved areas, restoration shall be
equal to existing conditions and compaction shall meet the requirements
of Item P-152. Restoration shall be considered incidental to the pay
item of which it is a component part.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify the correct method of turfing and remember to
> include in the construction documents the appropriate FAA turfing
> specification for restoration related to the installation of the power
> cables.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Under certain conditions, it may be beneficial to install cables by
> cable plowing. This type of installation method should only be
> specified where sandy soils are prevalent and with no rocks or other
> debris that would nick or cut the cable insulation. The engineer
> should specify the equipment to be used so the cables are placed at a
> minimum depth of 18 inches below finished grade. The cable should be
> manually unreeled off the spool as the machine travels, such that the
> earth is not unreeling the spool.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**108‑3.4 CABLE MARKERS FOR DIRECT-BURIED CABLE.** The location of
direct buried circuits shall be marked by a concrete slab marker, 2 feet
(60 cm) square and 4-6 inches (100-150 mm) thick, extending
approximately 1 inch (25 mm) above the surface. Each cable run from a
line of lights and signs to the equipment vault shall be marked at
approximately every 200 feet (60 m) along the cable run, with an
additional marker at each change of direction of cable run. All other
direct-buried cable shall be marked in the same manner. Cable markers
shall be installed directly above the cable. The Contractor shall
impress the word "CABLE" and directional arrows on each cable marking
slab. The letters shall be approximately 4 inches (100 mm) high and 3
inches (75 mm) wide, with width of stroke 1/2 inch (12 mm) and 1/4 inch
(6 mm) deep.

The location of each underground cable connection, except at lighting
units, or isolation transformers, or power adapters shall be marked by a
concrete marker slab placed above the connection. The Contractor shall
impress the word "SPLICE" on each slab. The Contractor also shall
impress additional circuit identification symbols on each slab as
directed by the Engineer. All cable markers and splice markers shall be
painted international orange. Paint shall be specifically manufactured
for uncured exterior concrete. Furnishing and installation of cable
markers is incidental to the respective cable pay item.

**108‑3.5 SPLICING.** Connections of the type shown on the plans shall
be made by experienced personnel regularly engaged in this type of work
and shall be made as follows:

**a. Cast Splices.** These shall be made by using crimp connectors for
jointing conductors. Molds shall be assembled, and the compound shall be
mixed and poured in accordance with manufacturer\'s instructions and to
the satisfaction of the Engineer.

**b. Field‑attached Plug‑in Splices.** These shall be assembled in
accordance with manufacturer\'s instructions. These splices shall be
made by plugging directly into mating connectors. In all cases the joint
where the connectors come together shall be wrapped with at least one
layer of rubber or synthetic rubber tape and one layer of plastic tape,
one‑half lapped, extending at least 1‑1/2 inches (37 mm) on each side of
the joint.

**c. Factory‑Molded Plug‑in Splices.** These shall be made by plugging
directly into mating connectors. In all cases, the joint where the
connectors come together shall be wrapped with at least one layer of
rubber or synthetic rubber tape and one layer of plastic tape, one‑half
lapped, extending at least 1‑1/2 inches (37 mm) on each side of the
joint.

**d. Taped or Heat-Shrinked Splices.** A taped splice shall be made in
the following manner:

Bring the cables to their final position and cut so that the conductors
will butt. Remove insulation and jacket allowing for bare conductor of
proper length to fit compression sleeve connector with 1/4 inch (6 mm)
of bare conductor on each side of the connector. Prior to splicing, the
two ends of the cable insulation shall be penciled using a tool designed
specifically for this purpose and for cable size and type. Do not use
emery paper on splicing operation since it contains metallic particles.
The copper conductors shall be thoroughly cleaned. Join the conductors
by inserting them equidistant into the compression connection sleeve.
Crimp conductors firmly in place with crimping tool that requires a
complete crimp before tool can be removed. Test the crimped connection
by pulling on the cable. Scrape the insulation to assure that the entire
surface over which the tape will be applied (plus 3 inches (75 mm) on
each end) is clean. After scraping wipe the entire area with a clean
lint‑free cloth. Do not use solvents.

Apply high‑voltage rubber tape one‑half lapped over bare conductor. This
tape should be tensioned as recommended by the manufacturer. Voids in
the connector area may be eliminated by highly elongating the tape,
stretching it just short of its breaking point. Throughout the rest of
the splice less tension should be used. Always attempt to exactly
half‑lap to produce a uniform buildup. Continue buildup to 1‑1/2 times
cable diameter over the body of the splice with ends tapered a distance
of approximately 1 inch (25 mm) over the original jacket. Cover rubber
tape with two layers of vinyl pressure‑sensitive tape one‑half lapped.
Do not use glyptol or lacquer over vinyl tape as they react as solvents
to the tape. No further cable covering or splice boxes are required.

Heat shrinkable tubing shall be installed following manufacturer's
instructions. Direct flame heating shall not be permitted unless
recommended by the manufacturer. Cable surfaces within the limits of the
heat-shrink application shall be clean and free of contaminates prior to
application.

**108‑3.6 BARE COUNTERPOISE WIRE INSTALLATION FOR LIGHTNING PROTECTION
AND GROUNDING.** If shown on the plans or included in the job
specifications, bare counterpoise copper wire shall be installed for
lightning protection of the underground cables. Counterpoise wire shall
be installed in the same trench for the entire length of buried cable,
conduits and duct banks that are installed to contain airfield cables.
Where the cable or duct/conduit trench runs parallel to the edge of
pavement, the counterpoise shall be installed in a separate trench
located half the distance between the pavement edge and the cable or
duct/conduit trench. In trenches not parallel to pavement edges,
counterpoise wire shall be installed continuously a minimum of 4 inches
above the cable, conduit or duct bank, or as shown on the plans if
greater. Additionally, counterpoise wire shall be installed at least 8
inches below the top of subgrade in paved areas or 10 inches below
finished grade in un-paved areas. This dimension may be less than 4
inches where conduit is to be embedded in existing pavement.
Counterpoise wire shall not be installed in conduit.

The counterpoise wire shall be routed around to each light fixture base,
mounting stake, or junction/access structures. The counterpoise wire
shall also be exothermically welded to ground rods installed as shown on
the plans but not more than 500feet (150 m) apart around the entire
circuit.

The counterpoise system shall be continuous and terminate at the
transformer vault or at the power source. It shall be securely attached
to the vault or equipment external ground ring or other made electrode
grounding system. The connections shall be made as shown on the plans
and in the specifications.

If shown on the plans or in the specifications, a separate equipment
(safety) ground system shall be provided in addition to the counterpoise
wire using one of the following methods:

**(1)** A ground rod installed at and securely attached to each light
fixture base, mounting stake if painted, and to all metal surfaces at
junction/access structures.

**(2)** Install an insulated equipment ground conductor internal to the
conduit system and securely attached it to each light fixture base and
to all metal surfaces at junction/access structures. This equipment
ground conductor shall also be exothermically welded to ground rods
installed not more than 500 feet (150 m) apart around the circuit.

**a. Counterpoise Installation Above Multiple Conduits and Duct Banks.**
Counterpoise wires shall be installed above multiple conduits/duct banks
for airfield lighting cables, with the intent being to provide a
complete cone of protection over the airfield lighting cables. When
multiple conduits and/or duct banks for airfield cable are installed in
the same trench, the number and location of counterpoise wires above the
conduits shall be adequate to provide a complete cone of protection
measured 22 ½ degrees each side of vertical.

Where duct banks pass under pavement to be constructed in the project,
the counterpoise shall be placed above the duct bank. Reference details
on the construction plans.

**b. Counterpoise Installation at Existing Duct Banks.** When airfield
lighting cables are indicated on the plans to be routed through existing
duct banks, the new counterpoise wiring shall be terminated at ground
rods at each end of the existing duct bank where the cables being
protected enter and exit the duct bank. The new counterpoise conductor
shall be bonded to the existing counterpoise system.

**108-3.7 EXOTHERMIC BONDING.** Bonding of counterpoise wire shall be by
the exothermic welding process. Only personnel experienced in and
regularly engaged in this type of work shall make these connections.

Contractor shall demonstrate to the satisfaction of the Engineer, the
welding kits, materials and procedures to be used for welded connections
prior to any installations in the field. The installations shall comply
with the manufacturer\'s recommendations and the following:

All slag shall be removed from welds.

For welds at light fixture base cans, all galvanized coated surface
areas and \"melt\" areas, both inside and outside of base cans, damaged
by exothermic bond process shall be restored by coating with a liquid
cold-galvanizing compound conforming to U.S. Navy galvanized repair
coating meeting Mil. Spec. MIL-P-21035. Surfaces to be coated shall be
prepared and compound applied in accordance with manufacturer\'s
recommendations.

> All buried copper and weld material at weld connections shall be
> thoroughly coated 6 mil of 3M "Scotchkote," or approved equivalent, or
> coated with coal tar bitumastic material to prevent surface exposure
> to corrosive soil or moisture.\"

**108-3.8 TESTING.** The Contractor shall furnish all necessary
equipment and appliances for testing the airport electrical systems and
underground cable circuits before and after installation. The Contractor
shall perform all tests in the presence of the Engineer. The Contractor
shall demonstrate the electrical characteristics to the satisfaction of
the Engineer. All costs for testing are incidental to the respective
item being tested. For phased projects, the tests must be completed by
phase and results meeting the specifications below must be maintained by
the Contractor throughout the entire project as well as during the
ensuing warranty period.

Earth resistance testing methods shall be submitted to the Engineer for
approval. Earth resistance testing results shall be recorded on an
approved form and testing shall be performed in the presence of the
Engineer. All such testing shall be at the sole expense of the
Contractor.

Should the counterpoise or ground grid conductors be damaged or
suspected of being damaged by construction activities the Contractor
shall test the conductors for continuity with a low resistance ohmmeter.
The conductors shall be isolated such that no parallel path exists and
tested for continuity. The Engineer shall approve of the test method
selected. All such testing shall be at the sole expense of the
Contractor.

After installation, the Contractor shall test and demonstrate to the
satisfaction of the Engineer the following:

**a.** That all affected lighting power and control circuits (existing
and new) are continuous and free from short circuits.

**b.** That all affected circuits (existing and new) are free from
unspecified grounds.

**c.** That the insulation resistance to ground of all new non-grounded
series circuits or cable segments is not less than 50 megohms.

**d.** That the insulation resistance to ground of all non-grounded
conductors of new multiple circuits or circuit segments is not less than
50 megohms.

**e.** That all affected circuits (existing and new) are properly
connected in accordance with applicable wiring diagrams.

**f.** That all affected circuits (existing and new) are operable. Tests
shall be conducted that include operating each control not less than 10
times and the continuous operation of each lighting and power circuit
for not less than 1/2 hour.

**g.** That the impedance to ground of each ground rod does not exceed
25 ohms prior to establishing connections to other ground electrodes.
The fall-of-potential ground impedance test shall be utilized, as
described by ANSI/IEEE Standard 81, to verify this requirement.

Two copies of tabulated results of all cable tests performed shall be
supplied by the Contractor to the Engineer. Where connecting new cable
to existing cable, ground resistance tests shall be performed on the new
cable prior to connection to the existing circuit.

There are no approved \"repair\" procedures for items that have failed
testing other than complete replacement.

METHOD OF MEASUREMENT

**108‑4.1** Trenching shall be measured by the linear feet (meters) of
trench, including the excavation, backfill, and restoration, completed,
measured as excavated, and accepted as satisfactory.

When specified, separate measurement shall be made for trenches of
various specified widths.

The cost of all excavation, backfill, dewatering and restoration
regardless of the type of material encountered shall be included in the
unit price bid for the work.

**108‑4.2** Cable or counterpoise wire installed in trench, duct bank or
conduit shall be measured by the number of linear feet (meters) of cable
or counterpoise wire installed in trenches, duct bank or conduit,
including ground rods and grounding connectors, and trench marking tape
ready for operation, and accepted as satisfactory. Separate measurement
shall be made for each cable or counterpoise wire installed in trench,
duct bank or conduit. The measurement for this item **\[shall\] \[shall
not\]** include additional quantities required for slack.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to decide if the quantity of cable provided in the bid
> tabulations includes an estimated quantity for slack. If so, this
> should be clearly identified on the plans and specifications. If not,
> add the following language at the end of paragraph 108-4.2:**
>
> **"Cable and counterpoise slack is considered incidental to this item
> and is included in the contractor's unit price. No separate
> measurement or payment will be made for cable or counterpoise
> slack."**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

BASIS OF PAYMENT

**108‑5.1** Payment will be made at the contract unit price for
trenching, cable and bare counterpoise wire installed in trench
(direct-buried), or cable and equipment ground installed in duct bank or
conduit, in place by the Contractor and accepted by the Engineer. This
price shall be full compensation for furnishing all materials and for
all preparation and installation of these materials, and for all labor,
equipment, tools, and incidentals, including ground rods and ground
connectors and trench marking tape, necessary to complete this item.

Payment will be made under:

> Item L‑108‑5.1 Trenching for direct-buried cable ---per linear foot
> (meter)
>
> Item L‑108‑5.2 **\[No. 8 AWG\] \[No. 6 AWG\]** L-824C Cable, installed
> in trench, duct bank or conduit---per liner foot (meter)

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify appropriate size of cable. If more than one size
> is required on the project, provide additional item nos.; one for each
> size and type.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> Item L-108-5.3 Bare Counterpoise Wire, installed in trench, duct bank
> or conduit, including ground rods and ground connectors---per linear
> foot (meter)
>
> Item L-108-5.4 Bare or insulated equipment ground, installed in duct
> bank or conduit including ground rods and ground conductors -- per
> linear foot (meter).

MATERIAL REQUIREMENTS

> AC 150/5345‑7 Specification for L‑824 Underground Electrical Cable for
> Airport Lighting Circuits
>
> AC 150/5345‑26 Specification for L‑823 Plug and Receptacle Cable
> Connectors
>
> FED SPEC J‑C‑30 Cable and Wire, Electrical Power, Fixed Installation
> (cancelled; replaced by A-A-59544 Cable and Wire, Electrical (Power,
> Fixed Installation))
>
> FED SPEC A-A-55809 Insulation Tape, Electrical, Pressure‑Sensitive
> Adhesive,
>
> Plastic
>
> ASTM B 3 Soft or Annealed Copper Wire
>
> ASTM D 4388 Rubber tapes, Nonmetallic Semiconducting and Electrically
> Insulating

REFERENCE DOCUMENTS

> NFPA No. 70 National Electrical Code (NEC)
>
> MIL-S-23586C Sealing Compound, Electrical, Silicone Rubber
>
> Building Industry Consulting Service International (BICSI)
>
> ANSI/IEEE Std 81 IEEE Guide for Measuring Earth Resistivity, Ground
> Impedance, and Earth Surface Potentials of a Ground System

**END OF ITEM L‑108**

# 

### **ITEM L-109 AIRPORT TRANSFORMER VAULT AND VAULT EQUIPMENT**

DESCRIPTION

109-1.1 This item shall consist of constructing an airport transformer
vault or a prefabricated metal housing these specifications in
accordance with the design and dimensions shown in the plans. This work
shall also include the installation of conduits in floor and foundation,
painting and lighting of the vault or metal housing, and the furnishing
of all incidentals necessary to produce a completed unit. Included as a
separate part under this item or as a separate item where an existing
vault is to be utilized shall be the furnishing of all vault equipment,
wiring, electrical buses, cable, conduit, potheads, and grounding
systems. This work shall also include the painting of equipment and
conduit; the marking and labeling of equipment and the labeling or
tagging of wires; the testing of the installation; and the furnishing of
all incidentals necessary to place it in operating condition as a
completed unit to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

**109-2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be certified and
listed under Advisory Circular (AC) 150/5345‑53, Airport Lighting
Equipment Certification Program.

**b.** All other equipment and materials covered by other referenced
specifications shall be subject to acceptance through manufacturer\'s
certification of compliance with the applicable specification when
requested by the Engineer.

**c.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

CONSTRUCTION OF VAULT AND PREFABRICATED METAL HOUSING

**109-2.2 CONCRETE.** The concrete for the vault shall be proportioned,
placed, and cured in accordance with Item P-610, Structural Portland
Cement Concrete, using ¾-inch (18 mm) maximum size coarse aggregate.

**109-2.3 REINFORCING STEEL.** Reinforcing steel bars shall be
intermediate or structural grade deformed-type bars and shall meet the
requirements of ASTM A 615.

**109-2.4 BRICK.** Brick shall conform to ASTM C 62, Grade SW.

**109-2.5 RIGID STEEL CONDUIT.** Rigid steel conduit and fittings shall
be in accordance with Underwriters Laboratories Standard 6 and 514.

**109-2.6 LIGHTING.** Vault or metal-housing light fixtures shall be of
a vaporproof type.

**109-2.7 OUTLETS.** Convenience outlets shall be heavy-duty duplex
units designed for industrial service.

**109-2.8 SWITCHES.** Vault or metal-housing light switches shall be
single-pole switches.

**109-2.9 PAINT.**

**a.** Priming paint for ungalvanized metal surfaces shall be a high
solids alkyd primer conforming to TT‑P‑664D.

**b.** White paint for body and finish coats on metal and wood surfaces
shall be ready-mixed paint conforming to the Master Painter's Institute,
Reference #9, Exterior Alkyd, Gloss, VOC Range E2.

**c.** Priming paint for wood surfaces shall be mixed on the job by
thinning the above specified white paint by adding 1/2 pint (0.06 liter)
of raw linseed oil to each gallon (liter).

**d.** Paint for the floor, ceiling, and inside walls shall be in
accordance with Fed. Spec. TT-E-487. Walls and ceiling shall be light
gray and the floor shall be medium gray.

**e.** The roof coating shall be hot asphalt material in accordance with
ASTM D 2823.

**109-2.10 HIGH-VOLTAGE BUS.** High-voltage bus shall be standard weight
3/8-inch (9 mm) IPS copper tubing or it may be insulated copper cable of
the size and voltage rating specified.

**109-2.11 BUS CONNECTORS.** Connectors shall be similar to Burndy Type
NT (or equivalent) for copper tubing. Connectors for insulated bus cable
shall be of the proper size and type for the service intended.

**109-2.12 BUS SUPPORTS.** Bus supports shall be similar to Westinghouse
No. 527892 (or equivalent), insulated for 7,500 volts, single clamp type
for 2-bolt flat mounting.

**109-2.13 GROUND BUS.** Ground bus shall be 1/8 - x ¾-inch (3 x 18 mm)
minimum copper bus bar.

**109-2.14 SQUARE DUCT.** Duct shall be square similar to that
manufactured by the Square D Company (or equivalent), or the Trumbull
Electric Manufacturing Company (or equivalent). The entire front of the
duct on each section shall consist of hinged or removable cover for
ready access to the interior. The cross section of the duct shall be not
less than 4 x 4 inches (100 x 100 mm) except where otherwise shown in
the plans.

**109-2.15 GROUND RODS.** Ground rods shall be copper or copper‑clad of
the length and diameter specified in the plans.

**109-2.16 POTHEADS.** Potheads shall be similar to G&W Type N, Shape C
(or equivalent), unless otherwise specified. Potheads shall be furnished
with plain insulator bushings and conduit couplings. Potheads shall have
a rating not less than the circuit voltage.

**109-2.17 PREFABRICATED METAL HOUSING.** The prefabricated metal
housing shall be a commercially available unit.

**109-2.18 FAA-APPROVED EQUIPMENT.** Certain items of airport lighting
equipment installed in vaults are covered by individual FAA equipment
specifications. The specifications are listed below:

AC 150/5345-3 Specification for L-821 Panels for Remote Control of
Airport Lighting

AC 150/5345-5 Circuit Selector Switch

AC 150/5345-7 Specification for L-824 Underground Electrical Cable for
Airport Lighting Circuits

AC 150/5345-10 Specification for Constant Current Regulators and
Regulator Monitors

AC 150/5345-13 Specification for L-841 Auxiliary Relay Cabinet Assembly
for Pilot Control of Airport Lighting Circuits.

**109-2.19 OTHER ELECTRICAL EQUIPMENT.** Constant-current regulators,
distribution transformers, oil switches, cutouts, relays, terminal
blocks, transfer relays, circuit breakers, and all other regularly used
commercial items of electrical equipment not covered by FAA equipment
specifications shall conform to the applicable rulings and standards of
the Institute of Electrical and Electronic Engineers or the National
Electrical Manufacturers Association. When specified, test reports from
a testing laboratory indicating that the equipment meets the
specifications shall be supplied. In all cases, equipment shall be new
and a first-grade product. This equipment shall be supplied in the
quantities required for the specific project and shall incorporate the
electrical and mechanical characteristics specified in the proposal and
plans.

**109-2.20 WIRE.** Wire in conduit rated up to 5,000 volts shall conform
to AC 150/5345-7, Specification for L-824 Underground Electrical Cables
for Airport Lighting Circuits, for rubber insulated neoprene-covered
wire, or Fed. Spec. J-C-30, Type RHW, for rubber insulated
fibrous-covered wire. For ratings up to 600 volts, thermoplastic wire
conforming to Fed. Spec. J-C-30, Types TW, THW, and THWN, shall be used.
The wires shall be of the type, size, number of conductors, and voltage
shown in the plans or in the proposal.

**a. Control Circuits.** Unless otherwise indicated on the plans, wire
shall be not less than No. 12 AWG and shall be insulated for 600 volts.
If telephone control cable is specified, No. 19 AWG telephone cable
conforming to ICEA S-85-625-1996 specifications shall be used.

> **b. Power Circuits.**

**(1)** 600 volts maximum-Wire shall be No. 6 AWG or larger and
insulated for at least 600 volts.

**(2)** 3,000 volts maximum-Wire shall be No. 6 AWG or larger and
insulated for at least 3,000 volts.

**(3)** Over 3,000 volts-Wire shall be No. 6 AWG or larger and insulated
for at least the circuit voltage.

CONSTRUCTION METHODS

CONSTRUCTION OF VAULT AND PREFABRICATED METAL HOUSING

**109-3.1 GENERAL.** The Contractor shall construct the transformer
vault or prefabricated metal housing at the location indicated in the
plans. Vault construction shall be reinforced concrete, concrete
masonry, or brick wall as specified. The metal housing shall be
prefabricated equipment enclosure to be supplied in the size specified.
The mounting pad or floor details, installation methods, and equipment
placement are shown in the plans.

The Contractor shall clear, grade, and seed the area around the vault or
metal housing for a minimum distance of 10 feet (3 m) on all sides. The
slope shall be not less than ½-inch per foot (40 mm per m) away from the
vault or metal housing in all directions.

The vault shall provide adequate protection against weather elements,
including rain, wind-driven dust, snow, ice and excessive heat. The
vault shall have sufficient filtered ventilation, to assure that the
interior room temperatures and conditions do not exceed the recommended
limits of the electrical equipment to be installed in the vault.
Contractor is responsible for contacting the manufacturer of the
equipment to be installed to obtain environmental limitations of the
equipment to be installed.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The electrical vault shall provide reasonable protection of the
> equipment that it is intended to house. As most of the equipment
> located in the vault is likely housed in NEMA 1 enclosures, the vault
> itself shall be designed to provide sufficient protection against
> weather elements.**
>
> **Assure that the vault that is to be supplied has sufficient
> environmental controls to provide adequate ventilation to maintain
> temperatures within operational requirements of equipment to be
> installed. In addition, make sure that vault has sufficient seals
> and/or filters on doors and other openings to assure that wind-driven
> dust does not affect operation of equipment.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**109-3.2 FOUNDATION AND WALLS.**

**a. Reinforced Concrete Construction.** The Contractor shall construct
the foundation and walls in accordance with the details shown in the
plans. Unless otherwise specified, internal ties shall be of the
mechanical type so that when the forms are removed the ends of the ties
shall be at least 1-inch (25 mm) beneath the concrete surface; the holes
shall be plugged and finished to prevent discoloration. Reinforcing
steel shall be placed, as shown in the drawings, and secured in position
to prevent displacement during the concrete placement.

The external surfaces of the concrete shall be thoroughly worked during
the placing operation to force all coarse aggregate from the surface.
Thoroughly work the mortar against the forms to produce a smooth finish
free from air pockets and honeycomb.

The surface film of all pointed surfaces shall be removed before setting
occurs. As soon as the pointing has set sufficiently, the entire surface
inside and outside of the vault shall be thoroughly wet with water and
rubbed with a No. 16 carborundum stone, or equivalent quality abrasive,
bringing the surface to a paste. All form marks and projections shall be
removed. The surface produced shall be smooth and dense without pits or
irregularities. The materials which have been ground into a paste during
the rubbing process shall be spread or brushed uniformly over the entire
surface (except the interior surfaces that are to be painted shall have
all paste removed by washing before painting) and permitted to reset.
Final exterior finish shall be obtained by rubbing with No. 30
carborundum stone, or an equivalent quality abrasive. The surface shall
be rubbed until the entire surface is smooth and uniform in color.

**b. Brick and Concrete Construction.** When this type of construction
is specified, the foundation shall be concrete conforming to the details
shown in the plans. The outer edge of the foundation at the floor level
shall be beveled 1-½ inches (37 mm) at 45 degrees. Brick walls shall be
8 inches (200 cm) thick, laid in running bond with every sixth course a
header course. Brick shall be laid in cement mortar (1 part masonry
cement and 3 parts sand) with full mortar bed and shoved joints. All
joints shall be completely filled with mortar, and facing brick shall be
back-parged with mortar as work progresses. All joints shall be 3/8 inch
(9 mm) thick, exterior joints tooled concave, and interior joints struck
flush.  Both interior and exterior brick surfaces shall be cleaned and
nail holes, cracks and other defects filled with mortar.  When
specified, a nonfading mineral pigment mortar coloring shall be added to
the mortar. Steel reinforcing bars, 3/8-inch (9 mm) in diameter and 12
inches (300 mm) long, shall be set vertically in the center of the brick
wall on not more than 2-foot (60 cm) centers to project 2-½(60 mm)
inches into the concrete roof slab. Lintels for supporting the brickwork
over doors, windows, and louvers shall consist of two 4‑ x 3‑ x 3/8-inch
(100 x 75 x 9 mm) steel angles. Lintels shall be painted with one coat
of corrosion‑inhibiting primer before installation, and all exposed
parts shall be painted similar to doors and window sash after
installation.

Window sills may be concrete poured in place or precast concrete as
indicated in the plans. All exposed surfaces shall have a rubbed finish
as specified under reinforced concrete construction. After completion,
all interior and exterior faces of walls shall be scrubbed with a
solution of muriatic acid and water in the proportions of not less than
1 part acid to 10 parts of water. All traces of efflorescence, loose
mortar, and mortar stain shall be removed, and the walls washed down
with clear water.

**c. Concrete Masonry Construction.** When this type of construction is
specified, the foundation shall be concrete conforming to the details
shown in the plans. The concrete masonry units shall be standard sizes
and shapes and shall conform to ASTM C 90 and shall include the
closures, jambs, and other shapes required by the construction as shown
in the plans. Standard construction practice shall be followed for this
type of work including mortar, joints, reinforcing steel for extensions
into roof slab, etc. Plaster for interior walls, if specified, shall be
portland cement plaster.

**109-3.3 ROOF.** The roof shall be reinforced concrete as shown in the
plans. Reinforcing steel shall be placed as shown in the drawing and
secured in position to prevent displacement during the pouring of the
concrete. The concrete shall be poured monolithically and shall be free
of honeycombs and voids. The surface shall have a steel-troweled finish
and shall be sloped as shown in the drawing. The underside of the roof
slab shall be finished in the same manner as specified for walls.

One brush or mop coat of hot asphalt roof coating shall be applied to
the top surface of the roof slab. The asphalt material shall be heated
to within the range specified by the manufacturer and immediately
applied to the roof. The finished coat shall be continuous over the roof
surface and free from holidays and blisters. Smears and dribbles of
asphalt on the roof edges and building walls shall be removed.

**109-3.4 FLOOR.** The floor shall be reinforced concrete as shown in
the drawings. When present, all sod, roots, refuse, and other perishable
material shall be removed from the area under the floor to a depth of 8
inches (200 mm), unless a greater depth is specified in the invitation
for bids. This area shall be backfilled with materials consisting of
sand, cinders, gravel, or stone. Fill shall be placed in layers not to
exceed 4 inches (100 mm) and shall be thoroughly compacted by tamping or
rolling. A layer of building paper shall be placed over the fill prior
to placing concrete. The floor surfaces shall have a steel-troweled
finish. The floor shall be level unless a drain is specified, in which
case the floor shall be pitched ¼-inch (6 mm) per foot downward toward
the drain. A ¼-inch (6 mm) asphalt felt expansion joint shall be placed
between floor and foundation walls. The floor shall be poured
monolithically and shall be free of honeycombs and voids.

**109-3.5 FLOOR DRAIN.** If shown in the plans, a floor drain and dry
well shall be installed in the center of the floor of the equipment
room. The dry well shall be excavated 4 x 4 feet (120 x 120 cm) square
and to a depth of 4 feet (120 cm) below the finished floor elevation and
shall be backfilled to the elevation of the underside of the floor with
gravel - which shall all pass a 2-inch (50 mm) mesh sieve and shall all
be retained on a ¼-inch (6 mm) mesh sieve. The gravel backfill shall be
placed in 6-inch (150 mm) maximum layers, and the entire surface of each
layer shall be tamped either with a mechanical tamper or with a hand
tamper weighing not less than 25 pounds (11 kg) and having a face area
of not more than 36 square inches (234 square cm) nor less than
16 square inches (104 square cm). The drain inlet shall be set flush in
the concrete floor. The drain shall have a clear opening of not less
than 8 inches (200 mm) in diameter.

**109-3.6 CONDUITS IN FLOOR AND FOUNDATION.** Conduits shall be
installed in the floor and through the foundation walls in accordance
with the details shown in the plans. All underground conduit shall be
painted with a bituminous compound. Conduit shall be installed with a
coupling or metal conduit adapter flush with the top of the floor. All
incoming conduit shall be closed with a pipe plug to prevent the
entrance of foreign material during construction. Space conduit
entrances shall be left closed.

**109-3.7 DOORS.** Doors shall be metal-clad fireproof class a doors
conforming to requirements of the National Electric Code and local
electrical codes.

**109-3.8 PAINTING.** The floor, ceiling, and inside walls of concrete
construction shall first be given a hardening treatment, after which the
Contractor shall apply two coats of paint as specified below, except
that interior face brick walls need not be painted. The hardening
treatment shall consist of applying two coats of either a commercial
floor hardener or a solution made by dissolving 2 pounds (0.9 kg) of
magnesium fluosilicate or zinc sulphate crystals in 1 gallon (liter) of
water. Each coat shall be allowed to dry at least 48 hours before the
next application. After the second treating coat has dried, the surfaces
shall be brushed clean of all crystals and thoroughly washed with clear
water. Paint for walls and ceiling shall be a light gray color approved
by the Engineer. The floor paint shall be a medium gray color approved
by the Engineer.  Before painting, the surfaces shall be dry and clean.
The first coat shall be thinned by adding 2/3-quart (0.166 liters) of
spar varnish and 1/3‑quart (0.083 liters) of turpentine to each gallon
(liter) of paint. The second coat shall be applied without thinning. All
doors, lintels, and windows shall be cleaned to remove any rust or
foreign material and shall be given one body and one finish coat of
white paint. Bare metal surfaces shall be given a prime coat of
corrosion‑inhibiting primer prior to the body and finish coats.

**109-3.9 LIGHTS AND SWITCHES.** The Contractor shall furnish and
install a minimum of two duplex convenience outlets in the vault room.
Where a control room is specified, at least two duplex outlets shall be
installed.

INSTALLATION OF EQUIPMENT IN VAULT OR PREFABRICATED METAL HOUSING

**109-3.10 GENERAL.** The Contractor shall furnish, install, and connect
all equipment, equipment accessories, conduit, cables, wires, buses,
grounds, and support necessary to insure a complete and operable
electrical distribution center for the airport lighting system as
specified herein and shown in the plans. When specified, an emergency
power supply and transfer switch shall be provided and installed.

The equipment installation and mounting shall comply with the
requirements of the National Electrical Code and local code agency
having jurisdiction.

**109-3.11 POWER SUPPLY EQUIPMENT.** Transformers, regulators, booster
transformers, and other power supply equipment items shall be furnished
and installed at the location shown in the plans or as directed by the
Engineer. The power supply equipment shall be set on steel "H" sections,
"I" beams, channels, or concrete blocks to provide a minimum space of
1-½ inches (37 mm) between the equipment and the floor. The equipment
shall be placed so as not to obstruct the oil‑sampling plugs of the
oil‑filled units; and name-plates shall, so far as possible, not be
obscured.

If specified in the plans and specifications, equipment for an alternate
power source or an emergency power generator shall be furnished and
installed. The alternate power supply installation shall include all
equipment, accessories, an automatic changeover switch, and all
necessary wiring and connections. The emergency power generator set
shall be the size and type specified.

**109-3.12 SWITCHGEAR AND PANELS.** Oil switches, fused cutouts, relays,
transfer switches, panels, panel boards, and other similar items shall
be furnished and installed at the location shown in the plans or as
directed by the Engineer. Wall or ceiling mounted items shall be
attached to the wall or ceiling with galvanized bolts of not less than
3/8-inch (9 mm) diameter engaging metal expansion shields or anchors in
masonry or concrete vaults.

**109-3.13 DUCT AND CONDUIT.** The Contractor shall furnish and install
square-type exposed metallic ducts with hinged covers for the control
circuits in the vault. These shall be mounted along the walls behind all
floor-mounted equipment and immediately below all wall-mounted
equipment. The hinged covers shall be placed to open from the front side
with the hinges at the front bottom.

Wall brackets for square ducts shall be installed at all joints 2 feet
(60 cm) or more apart with intermediate brackets as specified. Conduit
shall be used between square ducts and equipment or between different
items of equipment when the equipment is designed for conduit
connection. When the equipment is not designed for conduit connection,
conductors shall enter the square-type control duct through insulating
bushings in the duct or on the conduit risers.

**109-3.14 CABLE ENTRANCE AND HIGH-VOLTAGE BUS SYSTEM.** Incoming
underground cable from field circuits and supply circuits will be
installed outside the walls of the transformer vault as a separate item
under Item L‑108. The Contractor installing the vault equipment shall
bring the cables from the trench or duct through the entrance conduits
into the vault and make the necessary electrical connections. For the
incoming and outgoing high voltage load circuits, the Contractor shall
furnish and install rigid metallic vi conduit risers, surmounted by
potheads, from floor level to the level as shown in the plans.

The incoming high-voltage power supply service to the vault shall enter
below the floor of the vault and shall rise from the floor level in a
rigid metallic conduit riser, surmounted by a pothead, as described
above. Using insulated high-voltage cable, the incoming power service
shall be connected from the pothead to the oil-fused cutouts or to the
specified disconnecting switch or equipment. From the oil-fused cutouts
or disconnecting device, the insulated service conductors shall be
connected to the overhead voltage bus system of the vault. The
high-voltage bus system shall utilize the materials specified and shall
be mounted and installed in accordance with the requirements of the
National Electrical Code or the local code agency having jurisdiction.

**109-3.15 WIRING AND CONNECTIONS.** The Contractor shall make all
necessary electrical connections in the vault in accordance with the
wiring diagrams furnished and as directed by the Engineer. In wiring to
the terminal blocks, the Contractor shall leave sufficient extra length
on each control lead to make future changes in connections at the
terminal block. This shall be accomplished by running each control lead
the longest way around the box to the proper terminal. Leads shall be
neatly laced in place.

**109-3.16 MARKING AND LABELING.** All equipment, control wires,
terminal blocks, etc., shall be tagged, marked, or labeled as specified
below:

**a. Wire Identification.** The Contractor shall furnish and install
self-sticking wire labels or identifying tags on all control wires at
the point where they connect to the control equipment or to the terminal
blocks. Wire labels, if used, shall be of the self‑sticking preprinted
type and of the manufacturer\'s recommended size for the wire involved.
Identification -markings designated in the plans shall be followed.
Tags, if used, shall be of fiber not less than ¾-inch (13 mm) in
diameter and not less than 1/32-inch (1 mm) thick. Identification
markings designated in the plans shall be stamped on tags by means of
smalltool dies. Each tag shall be securely tied to the proper wire by a
nonmetallic cord.

**b. Labels.** The Contractor shall stencil identifying labels on the
cases of regulators, breakers, and distribution and control relay cases
with white oil paint as designated by the Engineer. The letters and
numerals shall be not less than 1 inch (25 mm) in height and shall be of
proportionate width. The Contractor shall also mark the correct circuit
designations in accordance with the wiring diagram on the terminal
marking strips, which are a part of each terminal block.

METHOD OF MEASUREMENT

**109-4.1** The quantity of vaults to be paid for under this item shall
consist of the number of vaults constructed in place and accepted as a
complete unit.

**109-4.2** The quantity of prefabricated metal housings to be paid for
under this item shall consist of the number of housings constructed in
place and accepted as a complete unit.

**109-4.3** The quantity of vault or prefabricated metal housing
equipment to be paid for under this item shall consist of all equipment
installed, connected, and accepted as a complete unit ready for
operation.

BASIS OF PAYMENT

**109-5.1** Payment will be made at the contract unit price for each
completed and accepted vault or prefabricated metal housing equipment
installation. This price shall be full compensation for furnishing all
materials and for all preparation, assembly, and installation of these
materials, and for all labor, equipment, tools, and incidentals
necessary to complete the item.

Payment will be made under:

Item L-109-5.1 Construction of Airport Transformer Vault in Place-per
unit

Item L-109-5.2 Installation of Airport Transformer Vault Equipment in
Place-per unit

Item L-109-5.3 Construction of Prefabricated Metal Housing and
Foundation in Place-per unit

Item L-109-5.4 Installation of Prefabricated Metal Housing Equipment in
Place-per unit

MATERIAL REQUIREMENTS

AC 150/5345-3 Specification for L-821 Panels for Remote Control of
Airport Lighting

AC 150/5345-5 Circuit Selector Switch

AC 150/5345-7 Specification for L-824 Underground Electrical Cable for
Airport Lighting Circuits

AC 150/5345-10 Specification for Constant Current Regulators and
Regulator Monitors

AC 150/5345-13A Specification for L-841 Auxiliary Relay Cabinet Assembly
for Pilot Control of Airport

> Lighting Circuits

ANSI/ICEA S-85-625-1996 Aircore, Polyethylene Insulated, Copper
Conductor, Telecommunications Cable

ASTM A 615 Specification for Deformed and Plain Billet Steel Bars for
Concrete Reinforcement

ASTM C 62 Specification for Building Brick (Solid Masonry Units Made
from Clay or Shale)

ASTM C 90 Concrete Masonry Units, Loadbearing

ASTM D 2823 Asphalt Roof-Coating

FED SPEC J-C-30 Cable and Wire, Electrical (Power, Fixed Installation)
(cancelled; replaced by AA-59544 Cable and Wire, Electrical (Power,
Fixed Installation))

FED SPEC TT-E-487 Enamel, Floor and Deck

Master Painter's Institute

END OF ITEM L-109

### **ITEM L-110 AIRPORT UNDERGROUND ELECTRICAL DUCT BANKS AND** **CONDUITS** {#item-l-110-airport-underground-electrical-duct-banks-and-conduits .Style-Heading-3Heading-3-CharHeading-3-Char1-CharHeading-3-Char-...}

DESCRIPTION

**110-1.1** This item shall consist of underground electrical conduits
and duct banks (single or multiple conduits encased in concrete)
installed in accordance with this specification at the locations and in
accordance with the dimensions, designs, and details shown on the plans.
This item shall include furnishing and installing of all underground
electrical duct banks and individual and multiple underground conduits.
It shall also include all turfing trenching, backfilling, removal, and
restoration of any paved or turfed areas; concrete encasement,
mandreling, pulling lines, duct markers, plugging of conduits, and the
testing of the installation as a completed system ready for installation
of cables in accordance with the plans and specifications. This item
shall also include furnishing and installing conduits and all
incidentals for providing positive drainage of the system. Verification
of existing ducts is incidental to the pay items provided in this
specification.

EQUIPMENT AND MATERIALS

**110-2.1 GENERAL.**

**a.** All equipment and materials covered by referenced specifications
shall be subject to acceptance through manufacturer\'s certification of
compliance with the applicable specification when so requested by the
Engineer.

**b.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**c.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**d.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**e.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**110-2.2 STEEL CONDUIT**. Rigid galvanized steel conduit and fittings
shall be hot dipped galvanized inside and out and conform to the
requirements of Underwriters Laboratories Standard 6, 514B, and 1242.

**110-2.3 PLASTIC CONDUIT.** Plastic conduit and fittings-shall conform
to the requirements of Fed. Spec. W\--C-1094, Underwriters Laboratories
Standards UL-651 and Article 347 of the current National Electrical Code
shall be one of the following, as shown on the plans:

**a.** Type I--Schedule 40 PVC suitable for underground use either
direct-buried or encased in concrete.

**b.** Type II--Schedule 40 PVC suitable for either above ground or
underground use.

The type of adhesive shall be as recommended by the conduit/fitting
manufacturer.

**110-2.4 SPLIT CONDUIT**. Split conduit shall be pre-manufactured for
the intended purpose and shall be made of steel or plastic.

**110-2.5 CONDUIT SPACERS**. Conduit spacers shall be prefabricated
interlocking units manufactured for the intended purpose. They shall be
of double wall construction made of high grade, high density
polyethylene complete with interlocking cap and base pads, They shall be
designed to accept No. 4 reinforcing bars installed vertically.

**110-2.6 CONCRETE.** Concrete shall conform to Item P-610, Structural
Portland Cement Concrete, using **\[ \]** inch maximum size coarse
aggregate with a minimum 28 day compressive strength of **\[ \]** psi.
Where reinforced duct banks are specified, reinforcing steel shall
conform to ASTM A 615 Grade 60. Concrete and reinforcing steel are
incidental to the respective pay item of which they are a component
part.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Typically, the maximum size aggregate should be speed as 1 inch,
> however, Engineer may specify smaller to accommodate special
> situations where 1 inch aggregate may he too large**
>
> **Item P-61 0 requires concrete to develop a 28 day compressive
> strength of 4, 000 psi. Engineer to determine the strength of concrete
> appropriate for the project and insert in paragraph 110-2.6.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**110-2.7 FLOWABLE BACKFILL.** Flowable material used to back fill
conduit and duct bank trenches shall conform to the requirements of Item
P-153 \"Controlled Low Strength Material\".

**110-2.8 DETECTABLE** WARNING **TAPE** Plastic, detectable, color as
noted magnetic tape shall be polyethylene film with a metallized foil
core and shall be 4-6 inches (75-150 MM) wide. Detectable tape is
incidental to the respective bid item.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Specify color and legend.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

CONSTRUCTION METHODS

**110-3.1 GENERAL**. The Contractor shall install underground duct banks
and conduits at the approximate locations indicated on the plans. The
Engineer shall indicate specific locations as the work progresses, if
required to differ from the plans. Duct banks and conduits shall be of
the size, material, and type indicated on the plans or specifications.
Where no size is indicated on the plans or in the specifications,
conduits shall be not less than 2 inches (50 mm) inside diameter or
comply with the National Electrical Code based on cable to be installed,
whichever is larger. All duct bank and conduit lines shall be laid so as
to grade toward access points and duct or conduit ends for drainage.
Unless shown otherwise on the plans, grades shall be at least 3 inches
(75 mm) per 100 feet (30 m). On runs where it is not practicable to
maintain the grade all one way, the duct bank and conduit lines shall be
graded from the center in both directions toward access points or
conduit ends, with a drain into the storm drainage system. Pockets or
traps where moisture may accumulate shall be avoided. No duct bank or
underground conduit shall be less than 18 inches below finished grade.
Where under pavement, the top of the duct bank shall not be less than 18
inches below the subgrade.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **For a closed conduit/duct bank system, the system should be designed
> to be connected to, and thus drain into, the airfield storm drainage
> system**
>
> **Engineer needs to be careful to define the term \"subgrade\" as it
> relates to pavement construction. In areas of pavement construction
> requiring the placement of embankment, or in areas requiring
> over-excavation to remove unsuitable material, the desired location of
> the top of the duct bank needs to be clearly identified In areas
> susceptible to frost, the top of the duct bank should be placed at or
> below the level of the frost line.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

The Contractor shall mandrel each individual conduit whether the conduit
is direct-buried or part of a duct bank. An iron-shod mandrel, not more
than 1/4-inch (6 mm) smaller than the bore of the conduit shall be
pulled or pushed through each conduit. The mandrel shall have a leather
or rubber gasket slightly larger than the conduit hole.

The Contractor shall swab out all conduits/ducts and clean base can,
manhole, pull boxes, etc. interiors [IMMEDIATELY]{.underline} prior to
pulling cable. Once cleaned and swabbed the base cans, manhole, pull
boxes, etc. and all accessible points of entry to the duct/conduit
system shall be kept closed except when installing cables. Cleaning of
ducts, base cans, manholes, etc. is incidental to the pay item of the
item being cleaned. All raceway systems left open, after initial
cleaning, for any reason shall be recleaned at the Contractor's expense.
All accessible points shall be kept closed when not installing cable.
The Contractor shall verify existing ducts proposed for use in this
project as clear and open. The Contractor shall notify the Engineer of
any blockage in the existing ducts.

For pulling the permanent wiring, each individual conduit, whether the
conduit is direct-buried or part of a duct bank, shall be provided with
a 200 pound test polypropylene pull rope. The ends shall be secured and
sufficient length shall be left in access points to prevent it from
slipping back into the conduit. Where spare conduits are installed, as
indicated on the plans, the open ends shall be plugged with removable
tapered plugs, designed for this purpose.

All conduits shall be securely fastened in place during construction and
shall be plugged to prevent contaminate from entering the conduits. Any
conduit section having a defective joint shall not be installed. Ducts
shall be supported and spaced apart using approved spacers at intervals
not to exceed 5 feet.

Unless otherwise shown on the plans, concrete encased duct banks shall
be utilized when crossing under pavements expected to carry aircraft
loads.

Where turf is well established and the sod can be removed, it shall be
carefully stripped and properly stored.

Trenches for conduits and duct banks may be excavated manually or with
mechanical trenching equipment unless in pavement, in which case they
shall be excavated with mechanical trenching equipment. Walls of
trenches shall be essentially vertical so that a minimum of shoulder
surface is disturbed. Blades of graders shall not be used to excavate
the trench.

When rock is encountered, the rock shall be removed to a depth of at
least 3 inches below the required conduit or duct bank depth and it
shall be replaced with bedding material of earth or sand containing no
mineral aggregate particles that would be retained on a 1/4-inch sieve.
Flowable backfill may alternatively be used The Contractor shall
ascertain the type of soil or rock to be excavated before bidding. All
such rock removal shall be performed and paid for under Item P-152.

Underground electrical warning (caution) tape shall be installed in the
trench above all underground duct banks and conduits in unpaved areas.
Contractor shall submit a sample of the proposed warning tape for
approval by the Engineer. If not shown on the plans, the warning tape
shall be located six inches above the duct/conduit or the counterpoise
wire if present.

Joints in plastic conduit shall be prepared in accordance with the
manufacturer\'s recommendations for the particular type of conduit.
Plastic conduit shall be prepared by application of a plastic cleaner
and brushing a plastic solvent on the outside of the conduit ends and on
the inside of the couplings. The conduit fitting shall then be slipped
together with a quick one-quarter turn twist to set the joint tightly.
Where more than one conduit is placed in a single trench, or in duct
banks, joints in the conduit shall be staggered a minimum of 2 feet.

Changes in direction of runs exceeding 10 degrees, either vertical or
horizontal, shall be accomplished using manufactured sweep bends.

Whether or not specifically indicated on the drawings, where the soil
encountered at established duct bank grade is an unsuitable material, as
determined by the Engineer, the unsuitable material shall be removed in
accordance with Item P-152 and replaced with suitable material.
Alternatively, additional duct bank supports that are adequate and
stable shall be installed, as approved by the Engineer.

All excavation shall be unclassified and shall be considered incidental
to the respective L-110 pay item of which it is a component part.
Dewatering necessary for duct installation, erosion and turbidity
control, in accordance with Federal, State, and Local requirements is
incidental to its respective pay item as a part of Item L-110. The cost
of all excavation regardless of type of material encountered, shall be
included in the unit price bid for the L-110 Item.

Unless otherwise specified, excavated materials that are deemed by the
Engineer to be unsuitable for use in backfill or embankments shall be
removed and disposed of off site.

Any excess excavation shall be filled with suitable material approved by
the Engineer and compacted in accordance with item P-152.

It is the Contractor\'s responsibility to locate existing utilities
within the work area prior to excavation. Where existing active cables)
cross proposed installations, the Contractor shall insure that these
cable(s) are adequately protected. Where crossings are unavoidable, no
splices will be allowed in the existing cables, except as specified on
the plans. Installation of new cable where such crossings must occur
shall proceed as follows:

**(1)** Existing cables shall be located manually. Unearthed cables
shall be inspected to assure absolutely no damage has occurred

**(2)** Trenching, etc., in cable areas shall then proceed with approval
of the Engineer, with care taken to minimize possible damage or
disruption of existing cable, including careful backfilling in area of
cable.

In the event that any previously identified cable is damaged during the
course of construction, the Contractor shall be responsible for the
complete repair.

**110-3.2 DUCT BANKS**. Unless otherwise shown in the plans, duct banks
shall be installed so that the top of the concrete envelope is not less
than 18 inches (45 cm) below the bottom of the base or stabilized base
course layers where installed under runways, taxiways, aprons, or other
paved areas, and not less than 18 inches (45 cm) below finished grade
where installed in unpaved areas.

Unless otherwise shown on the plans, duct banks under paved areas shall
extend at least 3 feet (90 cm) beyond the edges of the pavement or 3
feet (90 cm) beyond any underdrains that may be installed alongside the
paved area. Trenches for duct banks shall be opened the complete length
before concrete is placed so that if any obstructions are encountered,
proper provisions can be made to avoid them. Unless otherwise shown on
the plans, all duct banks shall be placed on a layer of concrete not
less than 3 inches (75 mm) thick prior to its initial set. Where two or
more conduits in the duct bank are intended to carry conductors of
equivalent voltage insulation rating, the Contractor shall space the
conduits not less than 1-1/2 inches (37 mm) apart (measured from outside
wall to outside wall). Where two or more conduits in the duct bank are
intended to carry conductors of differing voltage insulation rating, the
Contractor shall space the conduits not less than 3 inches apart
(measured from outside wall to outside wall). All such multiple conduits
shall be placed using conduit spacers applicable to the type of conduit.
As the conduit laying progresses, concrete shall be placed around and on
top of the conduits not less than 3 inches (75 mm) thick unless
otherwise shown on the plans. End bells or couplings shall be installed
flush with the concrete encasement at access points.

Conduits forming the duct bank shall be installed using conduit spacers.
No. 4 reinforcing bars shall be driven vertically into the soil a
minimum of 6 inches to anchor the assembly into the earth prior to
placing the concrete encasement. For this purpose, the spacers shall be
fastened down with locking collars attached to the vertical bars.
Spacers shall be installed at 5 -foot intervals. Spacers shall be in the
proper sizes and configurations to fit the conduits. Locking collars and
spacers shall be submitted to the Engineer for review prior to use.

When specified, the Contractor shall reinforce the bottom side and top
of encasements with steel reinforcing mesh or fabric or other approved
metal reinforcement. When directed, the Contractor shall supply
additional supports where the ground is soft and boggy, where ducts
cross under roadways, or where shown on the plans. Under such
conditions, the complete duct structure shall be supported on reinforced
concrete footings, piers, or piles located at approximately 5 foot (150
cm) intervals.

All pavement surfaces that are to have ducts installed therein shall be
neatly saw cut to form a vertical face. All excavation shall be included
in the contract with price for the duct.

Install a plastic, detectable, color as noted, 4-6 inch (75-150mm) wide
tape 8 inches (200mm) minimum below grade above all underground conduit
or duct lines not installed under pavement.

When existing cables are to be placed in split duct, encased in
concrete, the cable shall be carefully located and exposed by hand
tools. Prior to being placed in duct, the Engineer shall be notified so
that he may inspect the cable and determine that it is in good
condition. Where required, split duct shall be installed as shown on the
drawings or as required by the Engineer.

**110-3.3 CONDUITS WITHOUT CONCRETE ENCASEMENT**. Trenches for
single-conduit lines shall be not less than 6 inches (150 mm) nor more
than 12 inches (300 mm) wide, and the trench for 2 or more conduits
installed at the same level shall be proportionately wider. Trench
bottoms for conduits without concrete encasement shall be made to
conform accurately to grade so as to provide uniform support for the
conduit along its entire length.

Unless otherwise shown on the plans, a layer of fine earth material, at
least 4 inches (100 mm) thick (loose measurement) shall be placed in the
bottom of the trench as bedding for the conduit. The bedding material
shall consist of soft dirt, sand or other fine fill, and it shall
contain no particles that would be retained on a 1/4-inch (6 mm) sieve.
The bedding material shall be tamped until firm. Flowable backfill may
alternatively used.

Unless otherwise shown on plans, conduits shall be installed so that the
tops of all conduits are at least 18 inches (45 cm) below the finished
grade.

When two or more individual conduits intended to carry conductors of
equivalent voltage insulation rating are installed in the same trench
without concrete encasement, they shall be spaced not less than 2 inches
(50 mm) apart (measured from outside wall to outside wall) in a
horizontal direction and not less than 6 inches (150 mm) apart in a
vertical direction. Where two or more individual conduits intended to
carry conductors of differing voltage insulation rating are installed in
the same trench without concrete encasement, they shall spaced not less
than 3 inches (75 mm) apart (measured from outside wall to outside wall)
in a horizontal direction and lot less than 6 inches (150 mm) apart in a
vertical direction.

Trenches shall be opened the complete length between normal termination
points before conduit is installed so that if any unforeseen
obstructions are encountered, proper provisions can be made to avoid
them.

Conduits shall be installed using conduit spacers. No. 4 reinforcing
bars shall be driven vertically into the soil a minimum of 6 inches to
anchor the assembly into the earth while backfilling. For this purpose,
the spacers shall be fastened down with locking collars attached to the
vertical bars. Spacers shall be installed at 5 -foot intervals. Spacers
shall be in the proper sizes and configurations to fit the conduits.
Locking collars and spacers shall be submitted to the Engineer for
review prior to use.

**110-3.4 MARKERS**. The location of each end and of each change of
direction of conduits and duct banks shall be marked by a concrete slab
marker 2 feet (60 cm) square and 4-6 inches (100-150 mm) thick extending
approximately 1 inch (25 mm) above the surface. The markers shall also
be located directly above the ends of all conduits or duct banks, except
where they terminate in a junction/access structure or building.

The Contractor shall impress the word "DUCT" or "CONDUIT" on each marker
slab. The Contractor shall also impress on the slab the number and size
of conduits beneath the marker along with all other necessary
information as determined by the Engineer. The letters shall be 4 inches
(100 mm) high and 3 inches (75 mm) wide with width of stroke 1/2-inch
(12 mm) and 1/4-inch (6 mm) deep or as large as the available space
permits. Furnishing and installation of duct markers is incidental to
the respective duct pay item.

**110-3.5 BACKFILLING FOR CONDUITS.** For conduits, 8 inches (200 cm) of
sand, soft earth, or other fine fill (loose measurement) shall be placed
around the conduits ducts and carefully tamped around and over them with
hand tampers. The remaining trench shall then be backfilled and
compacted in accordance with Item P-152 \"Excavation and Embankment\"
except that material used for back fill shall be select material not
larger than 4 inches in diameter.

Flowable backfill may alternatively be used

Trenches shall not contain pools of water during back, filling
operations.

The trench shall be completely backfilled and tamped level with the
adjacent surface: except that, where sod is to be placed over the
trench, the backfilling shall be stopped at a depth equal to the
thickness of the sod to be used, with proper allowance for settlement.

Any excess excavated material shall be removed and disposed of in
accordance with instructions issued by the Engineer.

**110-3.6 BACKFILLING** **FOR DUCT BANKS**. After the concrete has
cured, the remaining trench shall be backfilled and compacted in
accordance with Item P-152 "Excavation and Embankment" except that the
material used for backfill shall be select material not larger than 4
inches in diameter. In addition to the requirements of P-152, where duct
banks are installed under pavement, one moisture/density test per lift
shall be made for each 250 linear feet of duct bank or one work
period\'s construction, whichever is less.

Flowable backfill may alternatively be used

Trenches shall not contain pools of water during backfilling operations.

The trench shall be completely backfilled and tamped level with the
adjacent surface: except that, where sod is to be placed over the
trench, the backfilling shall be stopped at a depth equal to the
thickness of the sod to be used, with proper allowance for settlement.

Any excess excavated material shall be removed and disposed of in
accordance with instructions issued by the Engineer.

**110-3.7 RESTORATION**. Where sod has been removed, it shall be
replaced as soon as possible after the backfilling is completed. All
areas disturbed by the work shall be restored to its original condition.
The restoration shall include **\[sodding\]** **\[topsoiling\]
\[fertilizing\] \[liming\] \[seeding\] \[sprigging\] \[mulching\]**
shown on the plans. The Contractor shall be held responsible for
maintaining all disturbed surfaces and replacements until final
acceptance. All restoration shall be considered incidental to the
respective L-110 pay item.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify the correct method of turfing and include in the
> construction documents the appropriate FAA turfing specification for
> restoration related to the installation of such duct banks and
> conduits.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

METHOD OF MEASUREMENT

**110-4.1** Underground conduits and duct banks shall be measured by the
linear feet (meter) of conduits and duct banks installed, including
encasement, locator tape, trenching and backfill with designated,
resolution, and for drain lines, the termination at the drainage
structure, all measured in place, completed, and accepted. Separate
measurement shall be made for the various types and sizes.

BASIS OF PAYMENT

**110-5.1** Payment will be made at the contract unit price per linear
foot for each type and size of conduit and duct bank completed and
accepted, including trench and backfill with the designated material,
and, for drain lines, the termination at the drainage structure. This
price shall be full compensation for furnishing all materials and for
all preparation, assembly, and installation of these materials, and for
all labor, equipment, tools, and incidentals necessary to complete this
item in accordance with the provisions and intent of the plans and
specifications.

Payment will be made under:

> Item L-110-5.1 Electrical Duct Bank, **\[# and Size\]** ---per linear
> foot (meter)
>
> Item L-110-5,2 Electrical Conduit **\[# and size\]**---per linear foot
> (meter)

MATERIAL REQUIREMENTS

Fed.Spec.W-C-1094 Conduit and Conduit Fittings; Plastic, Rigid
(cancelled; replaced by UL 514 Boxes, Nonmetallic Outlet, Flush Device
Boxes, & Covers, and UL 651 Standard for Conduit & Hope Conduit, Type EB
& A Rigid PVC)

+---------------------------+------------------------------------------+
| > Underwriters            | Rigid Metal Conduit                      |
| > Laboratories Standard 6 |                                          |
+---------------------------+------------------------------------------+
| > Underwriters            | Fittings for Cable and Conduit           |
| > Laboratories Standard   |                                          |
| > 514B                    |                                          |
+---------------------------+------------------------------------------+
| > Underwriters            | Intermediate Metal Conduit               |
| > Laboratories Standard   |                                          |
| > 1242                    |                                          |
+---------------------------+------------------------------------------+
| > Underwriters            | Schedule 40 and 80 Rigid PVC Conduit     |
| > Laboratories Standard   | (for Direct Burial)                      |
| > 651                     |                                          |
+---------------------------+------------------------------------------+
| > Underwriters            | Type EB and A Rigid PVC Conduit and HDPE |
| > Laboratories Standard   | Conduit (for concrete encasement)        |
| > 651A                    |                                          |
+---------------------------+------------------------------------------+

**END OF ITEM L-110**

### **ITEM L-115 ELECTRICAL MANHOLES AND JUNCTION STRUCTURES** {#item-l-115-electrical-manholes-and-junction-structures .Style-Heading-3Heading-3-CharHeading-3-Char1-CharHeading-3-Char-...}

DESCRIPTION

**115-1.1** This item shall consist of electrical manholes and junction
structures (handholes, pullboxes, junction cans, etc.) installed in
accordance with this specification, at the indicated locations and
conforming to the lines, grades and dimensions shown on the plans or as
required by the Engineer. This item shall include the installation of
each electrical manhole and/or junction structures with all associated
excavation, backfilling, sheeting and bracing, concrete, reinforcing
steel, ladders, appurtenances, testing, dewatering and restoration of
surfaces to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

**115-2.1 GENERAL.**

**a.** All equipment and materials covered by referenced specifications
shall be subject to acceptance through manufacturer\'s certification of
compliance with the applicable specification when so requested by the
Engineer.

**b.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**c.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**d.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**e.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract between the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**115-2.2 CONCRETE STRUCTURES.** Cast-in-place concrete structures shall
conform to the details and dimensions shown on the plans.

Provide precast concrete structures where shown on the plans. Precast
concrete structures shall be an approved standard design of the
manufacturer. Precast units shall have mortar or bitumastic sealer
placed between all joints to make them watertight. The structure shall
be designed to withstand \[ZZZ lb aircraft\] loads, unless otherwise
shown on the plans. Openings or knockouts shall be provided in the
structure as detailed on the plans.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify load characteristics for precast concrete
> structure based on design aircraft. It is the intent of this
> specification for the design engineer to design a cast-in-place
> structure that is detailed on the plans that will be suitable for the
> design loads and subgrade soil characteristics. If the Contractor
> proposes to use a substitute structure design, design calculations
> shall be submitted according to the procedure in the General
> Provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

Threaded inserts and pulling eyes shall be cast in as shown.

If the Contractor chooses to propose a different structural design,
signed and sealed shop drawings, design calculations, and other
information requested by the Engineer shall be submitted by the
Contractor to allow for a full evaluation by the Engineer. The Engineer
shall review in accordance with the process defined in the General
Provisions.

**115-2.3 JUNCTION CANS.** Junction Cans shall be L-867 Class 1
(non-load bearing) or L-868 Class 1 (load bearing) cans encased in
concrete. The cans shall have a galvanized steel blank cover, gasket,
and stainless steel hardware. Covers shall be 3/8\" thickness for L-867
and 3/4\" thickness for L-868.

**115-2.4 MORTAR.** The mortar shall be composed of one part of portland
cement and two parts of mortar sand, by volume. The portland cement
shall conform to the requirements of ASTM C 150, Type I. The sand shall
conform to the requirements of ASTM C 144. Hydrated lime may be added to
the mixture of sand and cement in an amount not to exceed 15 percent of
the weight of cement used. The hydrated lime shall meet the requirements
of ASTM C 6. The water shall be clean and free of deleterious amounts of
acid, alkalies or organic material. If the water is of questionable
quality, it shall be tested in accordance with AASHTO T-26.

**115-2.5 CONCRETE.** All concrete used in structures shall conform to
the requirements of Item P-610, Structural Portland Cement Concrete.

**115-2.6 FRAMES AND COVERS.** The frames shall conform to one of the
following requirements:

> **a.** Gray iron castings shall meet the requirements of ASTM A 48.
>
> **b.** Malleable iron castings shall meet the requirements of ASTM A
> 47.
>
> **c.** Steel castings shall meet the requirements of ASTM A 27.
>
> **d.** Structural steel for frames shall conform to the requirements
> of ASTM A-283, Grade D.
>
> **e.** Ductile iron castings shall conform to the requirements of ASTM
> A 536.
>
> **f.** Austempered ductile iron castings shall conform to the
> requirements of ASTM A 897.

All castings specified shall withstand a maximum tire pressure of \[ZZZ
psi\] and maximum load of \[ZZZ pounds\].

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify load characteristics for castings based on
> design aircraft.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

All castings or structural steel units shall conform to the dimensions
shown on the plans and shall be designed to support the loadings
specified.

Each frame and cover unit shall be provided with fastening members to
prevent it from being dislodged by traffic, but which will allow easy
removal for access to the structure.

All castings shall be thoroughly cleaned. After fabrication, structural
steel units shall be galvanized to meet the requirements of ASTM A 123.

Each cover shall have the word \"ELECTRIC\" or other approved
designation cast on it. Each frame and cover shall be as shown on the
plans or approved equivalent. No cable notches are required.

**115-2.7 LADDERS.** Ladders, if specified, shall be galvanized steel or
as shown on the plans.

**115-2.8 REINFORCING STEEL.** All reinforcing steel shall be deformed
bars of new billet steel meeting the requirements of ASTM A 615, Grade
60.

**115-2.9 BEDDING/SPECIAL BACKFILL.** Bedding or special backfill shall
be as shown on the plans.

**115-2.10 FLOWABLE BACKFILL.** Flowable material used to backfill shall
conform to the requirements of Item P-153 \"Controlled Low Strength
Material\".

**115-2.11 CABLE TRAYS.** Cable trays shall be of galvanized steel,
plastic, or aluminum. Cable trays shall be located as shown on the
plans.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer to specify cable tray based on type of structure and user
> preference.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**115-2.12 PLASTIC CONDUIT.** Plastic conduit shall comply with Item
L-110 - Airport Underground Electrical Duct Banks and Conduits.

**115-2.13 CONDUIT TERMINATORS.** Conduit terminators shall be
pre-manufactured for the specific purpose and sized as required or as
shown on the plans.

**115-2.14 PULLING-IN IRONS.** Pulling-in irons shall be manufactured
with 7/8-inch (22mm) diameter hot-dipped galvanized steel or
stress-relieved carbon steel roping designed for concrete applications
(7 strand, 1/2-inch diameter with an ultimate strength of 270,000 psi).
Where stress-relieved carbon steel roping is used, a rustproof sleeve
shall be installed at the hooking point and all exposed surfaces shall
be encapsulated with a polyester coating to prevent corrosion.

**115-2.15 GROUND RODS.** Ground rods shall be one piece, **\[solid
stainless steel\] \[copper\]** or **\[copper clad\].** The ground rods
shall be of the length and diameter specified on the plans, but in no
case shall they be less than 8-feet (240 cm) long nor less than 5/8 inch
(15 mm) in diameter.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **Engineer should evaluate the soils in the vicinity of proposed
> counterpoise and ground rod installations and determine if soil
> conditions would adversely affect copper. Engineer shall specify the
> type of ground rod and counterpoise wire to be installed in
> consideration of the soil conditions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

CONSTRUCTION METHODS

**115-3.1 UNCLASSIFIED EXCAVATION.** It is the Contractor\'s
responsibility to locate existing utilities within the work area prior
to excavation. Damage to utility lines, through lack of care in
excavating, shall be repaired or replaced to the satisfaction of the
Engineer without additional expense to the Owner.

The Contractor shall perform excavation for structures and structure
footings to the lines and grades or elevations shown on the plans or as
staked by the Engineer. The excavation shall be of sufficient size to
permit the placing of the full width and length of the structure or
structure footings shown.

All excavation shall be unclassified and shall be considered incidental
to the respective L-115 pay item of which it is a component part.
Dewatering necessary for L-115 structure installation, erosion and
turbidity control, in accordance with Federal, State, and Local
requirements is incidental to its respective pay item as a part of Item
L‑115. The cost of all excavation regardless of type of material
encountered, shall be included in the unit price bid for the L-115 Item.

Boulders, logs and all other objectionable material encountered in
excavation shall be removed. All rock and other hard foundation material
shall be cleaned of all loose material and cut to a firm surface either
level, stepped or serrated, as directed by the Engineer. All seams,
crevices, disintegrated rock and thin strata shall be removed. When
concrete is to rest on a surface other than rock, special care shall be
taken not to disturb the bottom of the excavation. Excavation to final
grade shall not be made until just before the concrete or reinforcing is
to be placed.

The Contractor shall provide all bracing, sheeting and shoring necessary
to implement and protect the excavation and the structure as required
for safety or conformance to governing laws. The cost of bracing,
sheeting and shoring shall be included in the unit price bid for the
structure.

Unless otherwise provided, bracing, sheeting and shoring involved in the
construction of this item shall be removed by the Contractor after the
completion of the structure. Removal shall be effected in a manner that
will not disturb or mar finished masonry. The cost of removal shall be
included in the unit price bid for the structure.

After each excavation is completed, the Contractor shall notify the
Engineer. Structures shall be placed after the Engineer has approved the
depth of the excavation and the suitability of the foundation material.

Prior to installation the Contractor shall provide a minimum of 6 inches
of sand or a material approved by the Engineer as a suitable base to
receive the structure. The base material shall be compacted and graded
level and at proper elevation to receive the structure in proper
relation to the conduit grade or ground cover requirements, as indicated
on the plans.

**115-3.2 CONCRETE STRUCTURES.** Concrete structures shall be built on
prepared foundations conforming to the dimensions and form indicated on
the plans. The concrete and construction methods shall conform to the
requirements specified in Item P-610. Any reinforcement required shall
be placed as indicated on the plans and shall be approved by the
Engineer before the concrete is placed.

**115-3.3 PRECAST UNIT INSTALLATIONS.** Precast units shall be installed
plumb and true. Joints shall be made watertight by use of sealant at
each tongue-and-groove joint and at roof of manhole. Excess sealant
shall be removed and severe surface projections on exterior of neck
shall be removed.

**115-3.4 PLACEMENT AND TREATMENT OF CASTINGS, FRAMES AND FITTINGS.**
All castings, frames and fittings shall be placed in the positions
indicated on the Plans or as directed by the Engineer and shall be set
true to line and to correct elevation. If frames or fittings are to be
set in concrete or cement mortar, all anchors or bolts shall be in place
and position before the concrete or mortar is placed. The unit shall not
be disturbed until the mortar or concrete has set.

Field connections shall be made with bolts, unless indicated otherwise.
Welding will not be permitted unless shown otherwise on the approved
shop drawings and written permission is granted by the casting
manufacturer. Erection equipment shall be suitable and safe for the
workman. Errors in shop fabrication or deformation resulting from
handling and transportation that prevent the proper assembly and fitting
of parts shall be reported immediately to the Engineer and approval of
the method of correction shall be obtained. Approved corrections shall
be made at Contractor\'s expense.

Anchor bolts and anchors shall be properly located and built into
connection work. Bolts and anchors shall be preset by the use of
templates or such other methods as may be required to locate the anchors
and anchor bolts accurately.

Pulling-in irons shall be located opposite all conduit entrances into
structures to provide a strong, convenient attachment for pulling-in
blocks when installing cables. Pulling-in irons shall be set directly
into the concrete walls of the structure.

**115-3.5 INSTALLATION OF LADDERS.** Ladders shall be installed such
that they may be removed if necessary. Mounting brackets shall be
supplied top and bottom and shall be cast in place during fabrication of
the structure or drilled and grouted in place after erection of the
structure.

**115-3.6 REMOVAL OF SHEETING AND BRACING.** In general, all sheeting
and bracing used to support the sides of trenches or other open
excavations shall be withdrawn as the trenches or other open excavations
are being refilled. That portion of the sheeting extending below the top
of a structure shall be withdrawn, unless otherwise directed, before
more than six (6) inches of material is placed above the top of the
structure and before any bracing is removed. Voids left by the sheeting
shall be carefully refilled with selected material and rammed tight with
tools especially adapted for the purpose or otherwise as may be
approved.

The Engineer may order the Contractor to delay the removal of sheeting
and bracing if, in his judgment, the installed work has not attained the
necessary strength to permit placing of backfill.

**115-3.7 BACKFILLING.** After a structure has been completed, the area
around it shall be backfilled in horizontal layers not to exceed 6
inches in thickness measured after compaction to the density
requirements in Item P-152. Each layer shall be deposited all around the
structure to approximately the same elevation. The top of the fill shall
meet the elevation shown on the plans or as directed by the Engineer.

Backfill shall not be placed against any structure until permission is
given by the Engineer. In the case of concrete, such permission shall
not be given until tests made by the laboratory under supervision of the
Engineer establish that the concrete has attained sufficient strength to
provide a factor of safety against damage or strain in withstanding any
pressure created by the backfill or the methods used in placing it.

Where required, the Engineer may direct the Contractor to add, at his
own expense, sufficient water during compaction to assure a complete
consolidation of the backfill. The Contractor shall be responsible for
all damage or injury done to conduits, duct banks, structures, property
or persons due to improper placing or compacting of backfill.

**115-3.8 CONNECTION OF DUCT BANKS.** To relieve stress of joint between
concrete-encased duct banks and structure walls, reinforcement rods
shall be placed in the structure wall and shall be formed and tied into
duct bank reinforcement at the time the duct bank is installed.

**115-3.9 GROUNDING.** A ground rod shall be installed in the floor of
all concrete structures so that the top of rod extends 6 inches (154 mm)
above the floor. The ground rod shall be installed within 1 foot of a
corner of the concrete structure. Ground rods shall be installed prior
to casting the bottom slab. Where the soil condition does not permit
driving the ground rod into the earth without damage to the ground rod,
the Contractor shall drill a 4-inch diameter hole into the earth to
receive the ground rod. The hole around the ground rod shall be filled
throughout its length, below slab, with Portland cement grout. Ground
rods shall be installed in precast bottom slab of structures by drilling
a hole through bottom slab and installing the ground rod. Bottom slab
penetration shall be sealed watertight with Portland cement grout around
the ground rod.

A grounding bus of 4/0 bare stranded copper shall be exothermically
bonded to the ground rod and loop the concrete structure walls. The
ground bus shall be a minimum of 1 foot above the floor of the structure
and separate from other cables. No. 2 AWG bare copper pigtails shall
bond the grounding bus to all cable trays and other metal hardware
within the concrete structure. Connections to the grounding bus shall be
exothermic. Hardware connections may be mechanical, using a lug designed
for that purpose.

**115-3.10 CLEANUP AND REPAIR.** After erection of all galvanized items,
damaged areas shall be repaired by applying a liquid cold-galvanizing
compound conforming MIL-P-21035. Surfaces shall be prepared and compound
applied in accordance with manufacturer\'s recommendations.

Prior to acceptance, the entire structure shall be cleaned of all dirt
and debris.

**115-3.11 RESTORATION.** After the backfill is completed, the
Contractor shall dispose of all surplus material, dirt and rubbish from
the site. The Contractor shall restore all disturbed areas equivalent to
or better than their original condition. All sodding, grading and
restoration shall be considered incidental to the respective L-115 pay
item.

The Contractor shall grade around structures as required to provide
positive drainage away from the structure.

Areas with special surface treatment, such as roads, sidewalks, or other
paved areas shall have backfill compacted to match surrounding areas,
and surfaces shall be repaired using materials comparable to original
materials.

After all work is completed, the Contractor shall remove all tools and
other equipment, leaving the entire site free, clear and in good
condition.

**115-3.12 INSPECTION.** Prior to final approval, the electrical
structures shall be thoroughly inspected for conformance with the plans
and this specification. Any indication of defects in materials or
workmanship shall be further investigated and corrected. The earth
resistance to ground of each ground rod shall not exceed 25 ohms. Each
ground rod shall be tested utilizing the fall-of-potential ground
impedance test as described by ANSI IEEE Standard 81. This test shall be
performed prior to establishing connections to other ground electrodes.

**115-3.13 Manhole Elevation Adjustments.** The Contractor shall adjust
the tops of existing manholes in areas designated in the Contract
Documents to the new elevations shown. The Contractor shall be
responsible for determining the exact height adjustment required to
raise the top of each manhole to the new elevations. The existing top
elevation of each manhole to be adjusted shall be determined in the
field and subtracted/added from the proposed top elevation.

The Contractor shall remove/extend the existing top section or ring and
cover on the manhole structure or manhole access. The Contractor shall
then install precast concrete sections or grade rings of the required
dimensions to adjust the manhole top to the new proposed elevation or
shall cut the existing manhole walls to shorten the existing structure,
as required by final grades. Finally, the Contractor shall reinstall the
manhole top section or ring and cover on top and check the new top
elevation.

The Contractor shall construct a concrete slab around the top of
adjusted structures located in graded areas that are not to be paved.
The concrete slab shall conform to the dimensions shown on the plans.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should require the precast sections be designed as
> specified in paragraph 115-2.2.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**115-3.14 Duct Extension to Existing Ducts.** Where existing concrete
encased ducts are to be extended, the duct extension shall be concrete
encased plastic conduit. The fittings to connect the ducts together
shall be standard manufactured connectors designed and approved for the
purpose. The duct extensions shall be installed according to the
concrete encased duct detail and as shown on the plans.

METHOD OF MEASUREMENT

**115-4.1** Electrical manholes and junction structures shall be
measured by each unit completed in place and accepted. The following
additional items are specifically included in each unit.

-   All Required Excavation, Dewatering

-   Sheeting and Bracing

-   All Required Backfilling with On-Site Materials

-   Restoration of All Surfaces and Finished Grading, Sodding

-   All Required Connections

-   Dewatering If Required

-   Temporary Cables and Connections

-   Ground Rod Testing

**115-4.2 Manhole elevation adjustments** shall be measured by the
completed unit installed, in place, completed, and accepted. Separate
measurement shall not be made for the various types and sizes.

BASIS OF PAYMENT

**115-5.1** The accepted quantity of electrical manholes and junction
structures will be paid for at the Contract unit price per each,
complete and in place. This price shall be full compensation for
furnishing all materials and for all preparation, excavation,
backfilling and placing of the materials, furnishing and installation of
appurtenances and connections to duct banks and other structures as may
be required to complete the item as shown on the plans and for all
labor, equipment, tools and incidentals necessary to complete the
structure.

**115-5.2** Payment shall be made at the contract unit price for manhole
elevation adjustments. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary, including but not limited to, spacers,
concrete, rebar, dewatering, excavating, backfill, topsoil, sodding and
pavement restoration, where required, to complete this item as shown in
the plans and to the satisfaction of the Engineer.

Payment will be made under:

> Item L-115-5.1 Electrical Manhole \[size and type\] -Per Each
>
> Item L-115-5.2 Electrical Junction Structure \[size and type\] -Per
> Each
>
> Item L-115-5.3 Existing Electrical Manhole/Junction Structure
> Elevation Adjustment \[size and type\] --Per Each

MATERIAL REQUIREMENTS

> ANSI/IEEE Std 81 IEEE Guide for Measuring Earth Resistivity, Ground
> Impedance, and Earth Surface Potentials of a Ground System
>
> AC 150/5345-7 Specification for L-824 Underground Electrical Cable for
> Airport Lighting Circuits
>
> AC 150/5345-26 Specification for L-823 Plug and Receptacle Cable
> Connectors
>
> FED SPEC J-C-30 Cable and Wire, Electrical Power, Fixed Installation
> (cancelled; replaced by AA-59544 Cable and Wire, Electrical (Power,
> Fixed Installation))
>
> ASTM B.3 Soft or Annealed Copper Wire
>
> ASTM B.8 Concentric-Lay-Stranded Copper Conductor, Hard, Medium-Hard,
> or Soft

**END OF ITEM L-115**

### **ITEM L-119 AIRPORT OBSTRUCTION LIGHTS** {#item-l-119-airport-obstruction-lights .Style-Heading-3Heading-3-CharHeading-3-Char1-CharHeading-3-Char-...}

DESCRIPTION

**119-1.1** This item shall consist of furnishing and installing
obstruction lights in accordance with these specifications. Included in
this item shall be the furnishing and installing of wood poles, steel or
iron pipes, or other supports as required in the plans or
specifications.

This item shall also include all wire and cable connections, the
furnishing and installing of all necessary conduits and fittings,
insulators, pole steps, pole cross arms, and the painting of poles and
pipes. In addition, it includes the furnishing and installing of all
lamps and, if required, the furnishing and installing of insulating
transformers, the servicing and testing of the installation and all
incidentals necessary to place the lights in operation as completed
units to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

**119-2.1 GENERAL.**

**a.** Airport lighting equipment and materials covered by Federal
Aviation Administration (FAA) specifications shall be certified and
listed under Advisory Circular (AC) 150/5345-53, Airport Lighting
Equipment Certification Program.

**b.** All other equipment and materials covered by other reference
specifications shall be subject to acceptance through manufacturer\'s
certification of compliance with the applicable specification when
requested by the Engineer.

**c.** Manufacturer\'s certifications shall not relieve the Contractor
of the Contractor's responsibility to provide materials in accordance
with these specifications and acceptable to the Engineer. Materials
supplied and/or installed that do not materially comply with these
specifications shall be removed, when directed by the Engineer and
replaced with materials, which do comply with these specifications, at
the sole cost of the Contractor.

**d.** All materials and equipment used to construct this item shall be
submitted to the Engineer for approval prior to ordering the equipment.
Submittals consisting of marked catalog sheets or shop drawings shall be
provided. Submittal data shall be presented in a clear, precise and
thorough manner. Original catalog sheets are preferred. Photocopies are
acceptable provided they are as good a quality as the original. Clearly
and boldly mark each copy to identify pertinent products or models
applicable to this project. Indicate all optional equipment and delete
non-pertinent data. Submittals for components of electrical equipment
and systems shall identify the equipment for which they apply on each
submittal sheet. Markings shall be boldly and clearly made with arrows
or circles (highlighting is not acceptable). Contractor is solely
responsible for delays in project accruing directly or indirectly from
late submissions or resubmissions of submittals.

**e.** The data submitted shall be sufficient, in the opinion of the
Engineer, to determine compliance with the plans and specifications.
\[The Contractor\'s submittals shall be neatly bound in a properly sized
3-ring binder, tabbed by specification section.\] The Engineer reserves
the right to reject any and all equipment, materials or procedures,
which, in the Engineer's opinion, does not meet the system design and
the standards and codes, specified herein.

**f.** All equipment and materials furnished and installed under this
section shall be guaranteed against defects in materials and workmanship
for a period of at least \[twelve (12) months\] from final acceptance by
the Owner. The defective materials and/or equipment shall be repaired or
replaced, at the Owner\'s discretion, with no additional cost to the
Owner.

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

> **The engineer should specify the form in which submittals are to be
> received and number of copies.**
>
> **The length of time for guarantee of materials and workmanship should
> be as stated in the contract h the owner and contractor and the
> contract special provisions.**

**\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \* \*
\* \* \* \* \* \* \* \* \* \* \* \* \* \***

**119-2.2 OBSTRUCTION LIGHTS.** The obstruction lights shall conform to
the requirements of AC 150/5345-43, Specification for Obstruction
Lighting Equipment.

**119-2.3 ISOLATION TRANSFORMERS.** Where required for series circuits,
the isolation transformers shall conform to the requirements of AC
150/5345-47, Isolation Transformers for Airport Lighting Systems.

**119-2.4 TRANSFORMER HOUSING.** Transformer housings, if specified,
shall conform to AC 150/5345-42, Specification for Airport Light Base
and Transformer Housings, Junction Boxes, and Accessories.

**119-2.5 CONDUIT.** Steel conduit and fittings shall be in accordance
with Underwriters Laboratories Standard 6, 514, and 1242.

**119-2.6 PLASTIC CONDUIT (for use below grade only).** Plastic conduit
and fittings-shall conform to the requirements of Fed. Spec. W\--C-1094
and Underwriters Laboratories Standards UL-651 and shall be one of the
following, as shown on the plans:

**a.** Type I--Schedule 40 PVC suitable for underground use either
direct-buried or encased in concrete.

> **b.** Type II--Schedule 40 PVC suitable for either above ground or
> underground use.

**119-2.7 WIRES.** Wires in conduit rated up to 5,000 volts shall
conform to AC 150/5345 7, Specification for L-824 Underground Electrical
Cable for Airport Lighting Circuits, for rubber insulated neoprene
covered wire, or Fed. Spec. J-C-30, Type RHW, for rubber insulated
fibrous covered wire. For ratings up to 600 volts, thermoplastic wire
conforming to Fed. Spec. J-C-30, Types TW, THW, and THWN-2, shall be
used. The wires shall be of the type, size, number of conductors, and
voltage shown in the plans or in the proposal. Overhead line wire from
pole to pole, where specified, shall conform to ANSI/ICEA S-70-547-1992.

**119-2.8 MISCELLANEOUS.** Paint, poles, pole steps, insulators, and all
other miscellaneous materials necessary for the completion of this item
shall be new and first-grade commercial products. These products shall
be as specified in the plans or specifications.

CONSTRUCTION METHODS

**119-3.1 PLACING THE OBSTRUCTION LIGHTS.** The Contractor shall furnish
and install single-or double-obstruction lights as specified in the
proposal and shown in the plans. The obstruction lights shall be mounted
on poles, buildings, or towers approximately at the location shown in
the plans. The exact location shall be as directed by the Engineer.

**119-3.2 INSTALLATION ON POLES.** Where obstruction lights are to be
mounted on poles, each obstruction light shall be installed with its hub
at least as high as the top of the pole. All wiring shall be run in not
less than 1-inch (25 mm) galvanized rigid steel conduit. If specified,
pole steps shall be furnished and installed, the lowest step being 5
feet (150 cm) above ground level. Steps shall be installed alternately
on diametrically opposite sides of the pole to give a rise of 18 inches
(45 cm) for each step. Conduit shall be fastened to the pole with
galvanized steel pipe straps and shall be secured by galvanized lag
screws. Poles shall be painted as shown in the plans and specifications.

When obstruction lights are installed on existing telephone or power
poles, a large fiber insulating sleeve of adequate diameter and not less
than 4-feet (120 cm) long, shall be installed to extend 6 inches (150
mm) above the conductors on the upper cross arm. In addition, the sleeve
shall be at least 18 inches (45 cm) below the conductors on the lower
crossarm. The details of this installation shall be in accordance with
the plans.

**119-3.3 INSTALLATION ON BEACON TOWER.** Where obstruction lights are
installed on a beacon tower, two obstruction lights shall be mounted on
top of the beacon tower using 1-inch (25 mm) conduit. The conduit shall
screw directly into the obstruction light fixtures and shall support
them at a height of not less than 4 inches (100 mm) above the top of the
rotating beacon. If obstruction lights are specified at lower levels,
the Contractor shall install not less than 1-inch (25 mm) galvanized
rigid steel conduit with standard conduit fittings for mounting the
fixtures. The fixtures shall be mounted in an upright position in all
cases. The conduit shall be fastened to the tower members with
"wraplock" straps, clamps, or approved fasteners spaced approximately 5
feet (150 cm) apart. Three coats of aviation-orange paint shall be
applied (one prime, one body, and one finish coat) to all exposed
material installed.

**119 3.4 INSTALLATION ON BUILDINGS, TOWERS, SMOKESTACKS, ETC.** Where
obstruction lights are to be installed on buildings or similar
structures, the installation shall be made in accordance with details
shown in the plans. The hub of the obstruction light shall be not less
than 1 foot (30 cm) above the highest point of the obstruction except in
the case of smokestacks where the uppermost units shall be mounted not
less than 5 feet (150 cm), nor more than 10 feet (3 m) below the top of
the stack. Conduit supporting the obstruction light units shall be
fastened to wooden structures with galvanized steel pipe straps and
shall be secured by 1-½ inch (37 mm) No. 10 galvanized wood screws.
Conduit shall be fastened to masonry structures by the use of expansion
shields, screw anchors, or toggle bolts using No. 10, or larger,
galvanized wood or machine screws. Conduit fastened to structural steel
shall have the straps held with not less than No. 10 roundhead machine
screws in drilled and tapped holes. Fastenings shall be approximately 5
feet (150 cm) apart. Three coats of aviation-orange paint shall be
applied (one prime, one body, and one finish coat) to all exposed
material installed.

**119-3.5 SERIES ISOLATION TRANSFORMERS.** The L-810 series obstruction
light does not include a film cutout; therefore, an isolation
transformer is required with each series lamp. Double series units of
this type require two series insulating transformers. The transformer
shall be housed in a base or buried directly in the earth in accordance
with the details shown in the plans.

**119‑3.6 WIRING.** The Contractor shall furnish all necessary labor and
materials and shall make complete electrical connections from the
underground cable or other source of power in accordance with the wiring
diagram furnished with the project plans. If underground cable is
required for the power feed and if duct is required under paved areas,
the cable and duct shall be installed in accordance with and paid for as
described in Item L-108, Underground Power Cable for Airports, and Item
L-110, Airport Underground Electrical Duct Banks and Conduit.

**119-3.7 LAMPS.** The Contractor shall furnish and install in each unit
one or two lamps, as required, conforming to the manufacturer's
requirements.

**119-3.8 TESTS.** The installation shall be fully tested by continuous
operation for not less than 1/2 hour as a completed unit prior to
acceptance. These tests shall include the functioning of each control
not less than 10 times.

METHOD OF MEASUREMENT

**119-4.1** The quantity of lights to be paid for under this item shall
be the number of single- or double-type obstruction lights installed and
accepted as completed units, in place, ready for operation.

BASIS OF PAYMENT

**119-5.1** Payment will be made at the contract unit price for each
completed obstruction light installed, in place by the Contractor, and
accepted by the Engineer. This price shall be full compensation for
furnishing all materials and for all preparation, assembly, and
installation of these materials, and for all labor, equipment, tools,
and incidentals necessary to complete this item.

Payment will be made under:

Item L-119-5.1 Airport Obstruction Light, in Place-per each

MATERIAL REQUIREMENTS

AC 150/5345-7 Specification for L-824 Underground Electrical Cable for
Airport Lighting Circuits

AC 150/5345-42 Specification for Airport Light Base and Transformer
Housing, Junction Boxes, and Accessories

AC 150/5345-43 Specification for Obstruction Lighting Equipment

AC 150/5345-47 Isolation Transformers for Airport Lighting Systems

ANSI/ICEA S-70-547-1992 Weather‑Resistant Polyolefin‑Covered Wire and
Cable

FED SPEC J-C-30 Cable and Wire, Electrical (Power, Fixed Installation)
(cancelled; replaced by AA-59544 Cable and Wire, Electrical (Power,
Fixed Installation))

**END OF ITEM L-119**