### **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.

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> **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.**

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**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.

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> **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.**

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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 \[ZZZ pounds\].

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

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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.

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

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**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.

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> **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.**

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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.

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

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**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**