+-----------------------------------+----------------------------------+
| ![](media/image1.wmf)             | **Advisory**                     |
|                                   |                                  |
| U.S. Department                   | ###### Circular                  |
|                                   |                                  |
| of Transportation                 |                                  |
|                                   |                                  |
| ##### Federal Aviation            |                                  |
|                                   |                                  |
| **Administration**                |                                  |
+-----------------------------------+----------------------------------+

+--------------------------------+--------------------+---------------+
| **Subject:** SPECIFICATIONS    | **Date:**          | **AC No:**    |
| FOR AIRPORT LIGHTING CIRCUIT   | September 14, 2006 | 150/5345-5B   |
| SELECTOR SWITCH                |                    |               |
|                                | **Initiated by:**  | **Change:**   |
|                                | AAS-100            |               |
+--------------------------------+--------------------+---------------+

1.  **PURPOSE.** This advisory circular (AC) contains a specification
    for a circuit selector switch for use in airport lighting circuits.

2.  **EFFECTIVE DATE.** Effective 6 months after the issue date of this
    advisory circular, only that equipment qualified in accordance with
    the specifications contained in this AC will be listed in AC
    150/5345-53, Airport Lighting Equipment Certification Program,
    current edition.

3.  **CANCELLATIONS.** This AC cancels AC 150/5345-5A, Specification for
    L-847 Circuit Selector Switch, 5,000 Volt 20 Ampere, dated March 23,
    1982.

4.  **PRINCIPAL CHANGES.** The following principal changes are contained
    in this specification.

a\. The addition of an optional L-847 monitoring contact closure
feature.

b\. The addition of an optional L-847 door interlock switch.

c\. The \"High-Voltage Contact\" cycle switching test was changed from
5,000 cycles to 10,000 cycles.

5.  **METRIC UNITS.** To promote an orderly transition to metric units,
    this specification includes both English and metric dimensions. The
    metric conversions may not be exact equivalents, and until an
    official changeover to metric units is effective, the English
    dimensions will govern.

# 

![](media/image2.png){width="2.5541666666666667in"
height="0.5965277777777778in"}

# 

# David L. Bennett

# Director Airport Safety and Standards

**1. SCOPE AND CLASSIFICATION.**

1.  **Scope.** This specification covers the requirements for a circuit
    selector switch to be used for switching the output of a constant
    current regulator (CCR) to one or more series lighting loops.

2.  **Classification.** This specification covers four types, two
    classes, and two sizes of circuit selector switches:

**1.2.1 Type.** This specification covers circuit selector switches of
the following types:

Type L-847-1 One circuit control

> Type L-847-2 Two circuit control

Type L-847-3 Three circuit control

Type L-847-4 Four circuit control

**1.2.2 Classes.** This specification covers circuit selector switches
of the following classes:

Class A Designed for indoor installations

> Class B Designed for outdoor installations

**1.2.3 Ratings.** This specification covers circuit selector switches
of the following ratings:

> Rating 1 Designed for 6.6 ampere, 5,000 volt circuits

Rating 2 Designed for 20 ampere, 5,000 volt circuits

2\. APPLICABLE DOCUMENTS.

**2.1 General.** The following documents, of the issue in effect on the
date of application for qualification, form part of this specification
and are applicable to the extent specified herein.

**2.2 Federal Aviation Administration (FAA) Documents.**

**2.2.1 FAA Standard.**

FAA-STD-012a Paint Systems for Equipment

FED-STD-595 Colors Used in Government Procurement

Copies of FAA Standards may be obtained from:

> Federal Aviation Administration
>
> ATO-W CM - NAS Documentation Control Center
>
> 800 Independence Avenue, SW
>
> Washington, DC 20591
>
> Phone: (202) 548-5502
>
> Fax: (202) 548-5501
>
> Website: [http://www.faa.gov/cm/dcc/]{.underline}

**2.2.2 FAA Advisory Circular.**

AC 150/5345-53 Airport Lighting Equipment Certification Program

Copies of FAA ACs may be obtained from:

> Department of Transportation
>
> General Services Division
>
> M-45
>
> Washington, DC 20590
>
> Phone: (202) 267-3115, -3161, and -8329
>
> Website:
> [http://www.faa.gov/airports_airtraffic/airports/resources/advisory_circulars/]{.underline}

**2.3 Military Standard.**

MIL-STD810C Environmental Test Methods

Copies of Military Standards and Specification Publications may be
obtained from:

> DAPS/DODSSP
>
> Building 4, Section D
>
> 700 Robins Avenue
>
> Philadelphia, PA 19111-5094
>
> Phone: (215) 697-2179
>
> Fax: (215) 697-1460
>
> Website: <http://dodssp.daps.dla.mil/>

3\. REQUIREMENTS.

**3.1** **General Functional Requirements.** The circuit selector
switch(es) must be capable of switching the output of a constant current
regulator to one or more series lighting circuits (loops), as
illustrated in figure 1. The selector switch must be controllable
locally or from a remote location. External control switches for remote
operation are to be supplied by others.

**3.2** **Environmental Requirements.** The circuit selector switch(es)
must be designed for operations under the following environmental
conditions:

> a\. An ambient temperature range of -40° F (-40° C) to + 131° F (+55°
> )C
>
> b\. A pressure altitude range of sea level to 10,000 feet (3,000 m).

c.  A relative humidity of up to 100 percent from sea level to 10,000
    feet (3,000 m) at an ambient temperature of + 131° F (+55° )C -.

**3.3 Enclosures.** All components must be mounted in an enclosure with
a hinged access door capable of being padlocked. Class A selector switch
enclosures must be designed for wall mounting and be equal to a National
Electrical Manufacturers Association (NEMA) type 1. Class B selector
switch enclosures must be designed to allow bottom mounting by means of
a 2-inch conduit and be equal to a NEMA type 4. All external electrical
wiring is to enter the enclosure through conduit. The size of the
enclosure must be held to a minimum consistent with good design
practices. All high-voltage connections must be made behind a dead front
panel so as to be inaccessible when the enclosure door is opened to
allow local control operations. The enclosure must be painted in
accordance with the applicable section of FAA-STD-012a. Class B
enclosures must be painted with aviation orange paint \# 12197 per
FED-STD-595.

**3.4** **High-Voltage Contacts.** The circuits must be switched through
a series of high-voltage contacts as shown in figure 1. When a circuit
is to be energized, the normally open contacts close first, followed by
the opening of the normally closed contact across the constant current
regulator input to the switch. The reverse procedure is followed when
de-energizing the circuit. The contacts must be rated to interrupt a
6.6-ampere circuit for the Rating 1 switch and a 20-ampere circuit for
the Rating 2 switch from a constant current regulated power source
having a circuit voltage of up to 5,000 volts. After 10,000 cycles of
switching, the assembly under load at rated current, the contact
resistance of the relay switches must not exceed 0.1 ohm. Contact
resistance is to be measured at rated current by voltage drop or a
milli-ohm meter. All relay/contactor technologies (air, vacuum type,
etc.) must not become pitted after cycle testing to the extent of
releasing smoke or causing fire.

a\. An optional monitoring contact closure for each L-847 output may be
specified, which closes dry contacts for any L-847 output that is
activated.

**3.5** **Switches.** Switches must be provided to permit remote or
local control and to make circuit selections. The control switch must
provide an OFF, REMOTE, and LOCAL function and be so marked. A switch
with the capacity to provide local circuit selection of 1, 2, 3, or 4
lighting loops, according to circuit selector switch type, must have
markings of Sl, S2, S3, and S4 as appropriate. The control switch must
function as follows:

> a\. When the control switch is in the REMOTE position, the internal
> control circuitry must allow single or multiple circuit selection to
> be made from a remote location.
>
> b\. When the control switch is in the OFF position, the input from the
> constant current regulator is short-circuited and unavailable for the
> lighting circuits.
>
> c\. When the control switch is in the LOCAL position, lighting circuit
> selections can be made locally.
>
> d\. An optional door interlock switch may be specified that
> de-energizes the output of all constant current regulators when the
> L-847 door is opened.

**3.6** **Terminals.** Suitable terminals must be provided for the
high-voltage connections from the constant current regulator and to the
lighting circuits. Terminals or a terminal strip must be provided for
the control connections. The terminals must be marked as follows:

> a\. The input terminals for connections from the constant current
> regulator must be labeled \"Rl\" and \"R2.\"
>
> b\. The output terminals for the lighting circuit(s) must be labeled
> \"Loop 1, Loop 2\", etc.
>
> c\. The terminals provided for control circuits must be labeled as
> follows: \"L\" and \"LN\" for 120 AC input voltage OR 24/48 volts DC
> input voltage; \"CR, C, Cl\", etc. for remote control switch(es).

Note: Alternate control signals must be appropriately labeled.

**3.7** **Assembly.** All wire used must have copper conductors of
adequate current carrying capacity with insulation suitable for the
working voltages encountered. Wires must be properly trained and cabled.
If printed circuit boards are used, they must be easily removable for
servicing or replacement. The switch assembly must be constructed so
parts will not work loose during normal operations.

**3.8** **Nameplate.** A nameplate, permanently and legibly filled in
with at least the information listed below, must be securely attached to
the outside of the enclosure.

#### CIRCUIT SELECTOR SWITCH

**Manufacturer\'s name**

### Type\_\_\_\_\_\_\_, Rating\_\_\_\_\_, Class

**3.9** **Equipment Instruction Manual.** A parts list with
installation, maintenance, and repair instructions must be furnished
with each assembly. Schematic drawings and necessary illustrations must
be provided to indicate clearly the method of installation and the
identity and location of all component parts to facilitate field
repairs.

**4.** **QUALITY ASSURANCE PROVISIONS.**

**4.1 Qualification Procedures.** Procedures for obtaining qualification
approval for equipment to be furnished for Federal grant assistance
programs at airports are contained in the current edition of AC
150/5345-53, Airport Lighting Equipment Certification Program.

**4.2** **Qualification Tests.** All tests contained in paragraph 4.4
are applicable for qualification.

**4.3** **Production Tests.** The following tests are applicable for all
production units: 4.4.3, 4.4.4, and 4.4.6.

**4.4** **Tests.**

**4.4.1** **Temperature-Altitude.** The test must be in accordance with
Procedure I, Method 504.1, of MIL-STD-810C for equipment in Category 2.
The equipment must be tested at atmospheric pressures corresponding to
sea level and 10,000 feet (3,000 m) altitude at both -67F (-55° C) and
+131F (+55° C). Make the following step substitutions to Table 504.1-11,
Category 2, for this test:

## 

## Table 1. Specifications for Temperature and Altitude Testing

  ------- -------- -------- ------- ------- -------- ------- ------- --------
  STEP             1a       1b      2       3        6       7       10

                                                                     

  Temp    \(F\)    77       -67     -67     -67      131     131     131

          \(C\)    25       -55     -55     -55      55      55      55

  Alt     (ft)     10,000   Site    Site    10,000   Site    Site    10,000

  Time    (hr)     1        4       \--     \--      16      \#      
  ------- -------- -------- ------- ------- -------- ------- ------- --------

\# - Until temperature stabilizes

**4.4.2** **Humidity.** The test must be in accordance with Procedure I,
Method 507.1, of MIL-STD-810C except that a total of two complete cycles
(48 hours) will be required.

**4.4.3** **Examination.** Each assembly must be inspected to assure
compliance with the requirements specified herein with respect to
materials, workmanship, and marking.

**4.4.4** **Dielectric.** Each assembly must withstand the following
alternating current voltage for one minute without failure:

a\. High-voltage input and output bushings to ground, 11,000 volts.

b\. Control circuit to ground, 1,500 volts.

**4.4.5** **Load Test.** The circuit selector switch must be subjected
to an operational test to demonstrate that the equipment will meet the
requirements of paragraph 3.4. Rating 1 equipment must be tested by
switching a fully loaded circuit of a 30 kW constant current regulator.
Rating 2 equipment must be tested by switching a fully loaded circuit of
a 70 kW constant current regulator. Multiple circuit selector switches
must be tested with one circuit loaded and the others short-circuited
during the test.

**4.4.6** **Operation.** Each assembly must be tested to verify that the
remote control circuit, the local control circuit, and the relay
switches operate satisfactorily.

Note: Alternate control signals must be appropriately labeled.

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