EDE SIR Attachment J.10 FAA-C-1217G Electrical Work, Interior.pdf

FAA-C-1217G

April 16, 2015

U.S. Department of Transportation Federal Aviation Administration

U.S. Department of Transportation

Federal Aviation Administration

Specification

ELECTRICAL WORK, INTERIOR

SUPERSEDING

FAA-C-1217F

Feb 26, 1996 i

Foreword

1. This specification is approved for use by all departments of the Federal Aviation

Administration (FAA).

2. This specification defines the minimum requirements for electrical work at FAA facilities.

National and international codes such as the National Electric Code primarily address safety. In particular, the National Electric Code, Paragraph 90.1(B), states "This Code contains provisions that are considered necessary for safety. Compliance therewith and proper maintenance results in an installation that is essentially free from hazard, but not necessarily efficient, convenient, or adequate for good service or future expansion of electrical use." It is the intent of this standard to ensure that installations are not only free from hazard, but are efficient, and adequate for good service. This standard does not supersede national codes, but augments them.

3. Specific FAA facilities, e.g., air route traffic control centers (ARTCCs), Metroplex Control

Facilities (MCFs), Terminal Radar Control (TRACONs), etc., may have requirements that are more stringent than these minimum requirements.

4. Comments, suggestions, or questions on this document should be addressed to:

Federal Aviation Administration

Power Services Group, Systems Engineering Team, AJW-221

800 Independence Avenue, SW.

Washington, DC 20591 ii

Table of Contents

1 Scope

1.1 Scope

1.2 Change Record

2 Applicable Documents

2.1 FAA Documents

2.2 Non-FAA Government Documents

2.3 Non-Government Documents

2.4 Order of precedence

3 Definitions

4 General Requirements

4.1 General

4.2 Grounding

4.3 Safe Work Practices

4.4 Short Circuit Analysis, Protective Device Coordination Analysis, and Arc Flash

Hazard Analysis

4.5 Lightning Protection, Grounding, Bonding, and Shielding

4.6 Harmonics Control

4.7 Quality Assurance Requirements

4.8 Tests

4.8.1 General

4.8.2 Insulation resistance

4.8.3 Load balancing

5 Detailed Requirements

5.1 Electrical Surge Protection

5.2 Wiring methods

5.2.1 General

5.2.1.1 Conductor routing

5.2.1.2 Conductor separation

5.2.2 Neutral conductor

5.2.3 Raceway systems

5.2.3.1 General

5.2.3.2 Conduit

5.2.3.2.1 General

5.2.3.2.2 Zinc coated ferrous rigid metal conduit

5.2.3.2.3 Intermediate metal conduit

5.2.3.2.4 Electrical metallic tubing

5.2.3.2.5 Rigid aluminum conduit

5.2.3.2.6 Rigid nonmetallic conduit

5.2.3.2.7 Flexible metal conduit, including Liquid-tight

5.2.3.2.8 Flexible nonmetallic conduit

5.2.3.2.9 Surface raceways

5.2.3.3 Wireways

iii

5.2.3.4 Cable rack systems

5.2.3.4.1 General

5.2.3.4.2 Dimensions

5.2.4 Raceway support systems

5.2.4.1 General

5.2.4.2 Telecommunication raceways

5.2.5 Conductors

5.2.5.1 Uninsulated conductors

5.2.5.2 Insulated conductors

5.2.5.2.1 Fixture wiring

5.2.5.2.2 Conductor identification

5.2.5.2.3 Color Coding for Ungrounded Conductors

5.2.5.3 Connectors and Splices

5.2.6 Metal-Clad Cable: Type MC

5.3 Boxes

5.3.1 Applications

5.3.2 Supports

5.4 Wiring devices

5.4.1 Receptacles

5.4.1.1 Ground Fault Circuit-Interrupter receptacles

5.4.1.2 Multioutlet Assemblies

5.4.1.2.1 General

5.4.1.2.2 Associated hardware

5.4.1.3 Emergency light receptacles

5.4.2 Wall switches

5.4.3 Device plates

5.5 Service equipment

5.5.1 Power

5.5.1.1 Service conduits

5.5.1.1.1 Underground service

5.5.1.1.2 Aerial service

5.5.1.2 Service disconnecting means

5.5.2 Ground Fault Protection

5.6 Panelboards

5.6.1 General

5.6.2 Wiring gutters

5.6.3 Circuit breakers

5.6.3.1 Thermal magnetic

5.6.3.2 Solid state

5.6.3.3 Self-enclosed circuit breakers

5.6.3.3.1 General

5.6.3.3.2 Thermal magnetic

5.6.3.3.3 Solid state/microprocessor

5.6.4 Bus bars

5.6.4.1 Ground bus

iv

5.7 Safety switches

5.8 Cabinets

5.9 Motors and controls

5.9.1 Motors

5.9.2 Motor controls

5.9.2.1 Reduced-voltage controllers

5.9.3 Motor disconnecting means

5.10 Dry-type transformers

5.10.1 General

5.10.2 Windings and taps

5.10.3 Insulation

5.10.4 Terminal compartments

5.10.5 Sound pressure levels and vibration isolation

5.10.6 Enclosures

5.10.7 Mounting

5.11 Equipment Identification

5.12 Fuses

5.13 Lamps and lighting fixtures

5.13.1 General

5.13.2 Fluorescent fixtures

5.13.2.1 Recessed Lighting

5.13.2.2 Suspended fluorescent fixtures

5.13.3 Suspended incandescent fixtures

5.13.4 Emergency lights

5.13.5 Lamps

5.14 Signal and communications

5.14.1 Entrance conduits

5.14.2 Transient protection demarcation box for electronic landlines

5.14.3 Fiber optics

6 Notes

6.1 Intended use

6.2 Tailoring guidance

1 Scope

1.1 Scope

This standard covers the minimum requirements for electrical power work at FAA facilities. The requirements in this standard are based upon performance and safety, and may exceed those of the

NFPA 70™, National Electric Code® (NEC), which deals with safety only. National Airspace

System (NAS) operations facilities, including Air Route Traffic Control Centers (ARTCCs), Metroplex Control Facilities (MCFs), and terminal radar control (TRACONs) may have performance requirements that may exceed the requirements listed in this standard. This document does not specifically address communication wiring and grounding requirements.

FAA-STD-019, LIGHTNING AND SURGE PROTECTION, GROUNDING, BONDING AND

SHIELDING REQUIREMENTS FOR FACILITIES AND ELECTRONIC EQUIPMENT, provides the minimum grounding requirements for facilities and equipment used in the NAS.

Where the phrase "unless otherwise indicated" or similar wording appears, it refers exclusively to other documents that are specific parts of interior electrical construction project contracts.

1.2 Change Record

This version is the initial release of the document.

2 Applicable Documents The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this standard, whether or not they are listed.

2.1 FAA Documents

FAA Orders

6950.22 Maintenance of Electrical Power Cables

6950.27 Short Circuit Analysis and Protective Device Coordination Study

6010.7A Joint Acceptance Inspection

FAA Standards

FAA-STD-019

LIGHTNING AND SURGE PROTECTION, GROUNDING,

BONDING AND SHIELDING REQUIREMENTS FOR

FACILITIES AND ELECTRONIC EQUIPMENT

FAA Specification

FAA-C-1391

Installation, Termination, Splicing, and Transient/Surge Protection of Underground Electrical Distribution System Power Cables

2.2 Non-FAA Government Documents

Standards

10 CFR 431

ENERGY EFFICIENCY PROGRAM FOR CERTAIN

COMMERCIAL AND INDUSTRIAL EQUIPMENT

Federal specifications W-C-596 General Specification for Electrical Power Connectors

A-A-59544 Cable and Wire, Electrical. (Power, Fixed Installation)

W-C-375 Circuit Breakers, Molded Case; Branch Circuit and Service

W-P-115 Panel, Power Distribution

A-A-55810 Conduit, Metal, Flexible

A-A-59551A Wire, Electrical, (uninsulated)

2.3 Non-Government Documents

The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.”

National Fire Protection Association (NFPA) publications NFPA 70 National Electrical Code (NEC)

NFPA 101 Life Safety Code

Underwriters' Laboratories (UL) Inc. standards

UL 5 Standard for Surface Metal Raceways and Fittings

UL 50 Enclosures for Electrical Equipment

UL 486A-486B Wire Connectors

UL 486C Splicing Wire Connectors

UL 486E

Standard for Equipment Wiring Terminals for Use with Aluminum and/or Copper Conductors

UL 514A Metallic Outlet Boxes

UL 514B Conduit, Tubing, and Cable Fittings

UL 651

Standard for Schedule 40, 80, Type EB and A Rigid PVC Conduit and Fittings

UL 797 Electrical Metallic Tubing - Steel

UL 870 Wireways, Auxiliary Gutters, and Associated Fittings

UL 924 Emergency Lighting and Power Equipment

Institute of Electrical and Electronics Engineers (IEEE) Inc. standards

STD C57.12.80

Standard Terminology for Power and Distribution Transformers

STD 141

Recommended Practice for Electric Power Distribution for Industrial Plants

National Electrical Manufacturers Association (NEMA) standards MG-1 Standard for Motors and Generators

ST 20 Dry Type Transformers for General Applications

WD 1 General Requirements for Wiring Devices

Steel Structures Painting Council standards SSPC-PS 10.01 Hot-Applied Coal Tar Enamel Painting System

Telecommunications Industry Association./Electronic Industries Alliance TIA/EIA 568-B Commercial Building Telecommunications Cabling Standard

TIA/EIA 569-A

Commercial Building Standard for Telecommunication Pathways and Spaces

2.4 Order of precedence

FAA-STD-019, LIGHTNING AND SURGE PROTECTION, GROUNDING, BONDING AND

SHIELDING REQUIREMENTS FOR FACILITIES AND ELECTRONIC EQUIPMENT is the governing standard for these particular issues, and takes precedence over this standard. In all other cases of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3 Definitions Definitions are derived from the NFPA 70, National Electric Code, except as noted.

Arc-Fault Circuit Interrupter (AFCI): A device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected.

Bonding Conductor or Jumper: A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.

Commissioned: A facility, system, subsystem, or equipment is considered to be commissioned if it has been formally accepted and placed into operational use of service in the NAS. It indicates that the ATO has assumed formal maintenance responsibility. (6010.7A, Joint Acceptance

Inspection)

Disconnecting Means: A device, or group of devices, or other means by which the conductors of a circuit can be disconnect from their source of supply.

Electrical Metallic Tubing: An unthreaded thinwall raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed utilizing appropriate fittings. Within FAA practice, acceptable EMT is made of steel with protective coatings.

Equipment Grounding Conductor: The conductive path installed to connect normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both. For FAA purposes, the Equipment Grounding Conductor (EGC) is to be green-insulated, solid or stranded, copper wire.

Flexible Metal Conduit: A raceway of circular cross section made of helically wound, formed, interlocked ferrous metal (steel) strip.

Ground-Fault Circuit Interrupter (GFCI): A device intended for the protection of personnel that functions to deenergize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device, currently 6 mA or higher. Class A devices do not trip when the current to ground is less than 4 mA.

Grounded Conductor: A system or circuit conductor that is intentionally grounded.

Grounding Conductor: A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes.

Grounding Electrode Conductor: A conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system.

Intermediate Metal Conduit (IMC): A steel threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings.

Interrupting Capacity: The highest current at rated voltage that the device can interrupt. (IEEE Std

100 “IEEE Standard Dictionary of Electrical and Electronic Terms.”)

Multioutlet Assembly: A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory.

Neutral Conductor: The conductor connected to the neutral point of a system that is intended to carry current under normal conditions.

Neutral Point: The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system. At the neutral point of the system, the vectorial sum of the nominal voltages from all other phases within the system that utilize the neutral, with respect to the neutral point, is zero potential.

Operational Suitability Demonstration (OSD): The OSD is a time period during which a new or improved facility is operated under intense scrutiny to document that it satisfies construction, installation, performance, operation, and maintenance criteria and is ready for operational use.

(6010.7A, Joint Acceptance Inspection)

Panelboard. A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front.

Relocatable Power Tap (RPT): A UL-1363 listed device that is a factory assembled, multiple outlet unit with a cord and plug, and may also include fuses, circuit breakers, switches and/or lights. RPTs are intended to be directly connected to a permanently installed receptacle. RPTs are also referred to as Temporary Power Tap (TPT) and power strips.

Rigid Metal Conduit (RMC): A threadable raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed with its integral or associated coupling and appropriate fittings. RMC is generally made of steel (ferrous) with protective coatings or aluminum (nonferrous). Within FAA practice, acceptable RMC is galvanized (zinc-coated) steel.

Service: The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.

Service Point: The point of connection between the facilities of the serving utility and the premises wiring.

Switchboard. A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments.

Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.

4 General Requirements

4.1 General

The orders, standards, rules, regulations, and reference specifications enumerated herein are considered as minimum requirements. FAA requirements often exceed those of other standards organizations such as the NEC. Adherence to other standards does not relieve contractors from furnishing and installing higher grades of materials and workmanship required by this standard.

Facility design and construction standards for specific NAS facilities may have detailed requirements for use of a particular wiring method. This standard for general electrical work at FAA facilities does not supersede any facility-specific standard. In no event shall electrical codes be violated.

Unscheduled interruptions of the electrical service to FAA facilities may cause aircraft accidents and loss of life. Work requiring a temporary or permanent energizing and/or de-energizing of equipment shall be scheduled in writing with the onsite FAA maintenance personnel. Only onsite FAA maintenance personnel are authorized to energize equipment, de-energize equipment or to operate a circuit breaker, switch, or fuse in an FAA facility. Work procedures shall include lock-out/tag-out procedures in accordance with FAA Order 3900.64 and NFPA 70E.

FAA installations shall meet or exceed the requirements of NFPA 70, National Electric Code.

4.2 Grounding

All grounding shall be in accordance with FAA-STD-019, current revision, and NEC, unless otherwise stated in Section 5, Detailed Requirements. In the event of conflict between FAA-

STD-019 and NEC, FAA-STD-019 has precedence.

4.3 Safe Work Practices

To the greatest extent possible, all electrical work shall be performed on de-energized material and equipment, using appropriate lock-out/tag-out (LOTO) procedures, per FAA and OSHA requirements. Work on energized systems shall be approved by the local FAA Safety &

Environmental Compliance Manager (SECM).

All persons working on energized electrical equipment wear appropriate personal protective equipment (PPE) and follow safe electrical work practices of FAA Order 3900.64 and the latest version of NFPA 70E. For all energized work, a minimum of two people are required to be working to ensure safety of each.

4.4 Short Circuit Analysis, Protective Device Coordination Analysis, and Arc Flash

Hazard Analysis

The distribution system and all component parts, when installed or as modified, must include a Short

Circuit Analysis, Protective Device Coordination Analysis, and Arc Flash Risk Assessment, in accordance with the current versions of (1) FAA Order 6950.27; (2) NFPA 70E; (3) IEEE 1584; (4) other PSG Guidance. Arc Flash labels are installed per the arc-flash study in accordance with FAA

Order 3900.64, and current version of NFPA 70E.

4.5 Lightning Protection, Grounding, Bonding, and Shielding

FAA grounding requirements often exceed those of the NEC. These requirements are considered the minimum necessary to adequately provide for the needs of the FAA missions – to prevent delay or loss of service, to minimize or preclude outages, and to enhance personnel safety. Further, the requirements in the document have been coordinated with industry standards, and in some cases exceed industry standards where necessary to meet the FAA missions. Reference FAA-STD-019, LIGHTNING AND SURGE PROTECTION, GROUNDING, BONDING AND SHIELDING

REQUIREMENTS FOR FACILITIES AND ELECTRONIC EQUIPMENT, when installing all NAS equipment. In no case, however, shall the NEC be violated.

All electrical surge protection systems shall be installed in accordance with the latest revision of

FAA-STD-019.

4.6 Harmonics Control

The distribution system and all component parts, when installed or as modified, shall be in accordance with IEEE Standard 519, Recommended Practices and Requirements for Harmonic Control.

4.7 Quality Assurance Requirements

All design of new facilities and modifications to existing facilities shall be subject to the scrutiny of the Joint Acceptance Inspection (JAI).

4.8 Tests

4.8.1 General

Unless otherwise indicated, the contractor shall furnish all test instruments, materials and labor necessary to perform the following tests. All tests shall be performed in the presence of the

Contracting Officer’s designated representative. All instruments shall have been calibrated within a period of one year preceding testing. Calibrations shall be traceable to applicable industry recognized standards.

4.8.2 Insulation resistance

Cables, conductors, and wires shall be tested prior to energization. Intrafacility wiring/cabling may be tested with a standard ohm meter set to the highest scale, measuring between phases, phase and neutral, phase and ground. A reading of infinite resistance indicates an acceptable installation. All testing shall be accomplished before connection is made to any existing equipment.

Intrafacility wiring/cabling, feeder and branch circuit insulation tests shall be performed after installation, but before connection to fixtures or appliances. Motors shall be tested for grounds or short circuits after installation but before start-up. Testing should be performed using 500-volt DC insulation resistance tester, but may be done with a standard ohm meter set to the highest scale, measuring between phases, phase and neutral, phase and ground. Using the 500-volt DC meter method, a resistance of 30 megaohms or greater indicates an acceptable installation. Using the standard ohm meter method, a reading of infinite resistance indicates an acceptable installation. All conductors shall test free from short circuits and grounds.

4.8.3 Load balancing

After the electrical installation has been completed, the contractor shall take current readings with a true RMS ammeter for the purpose of load balancing. These readings shall be taken at the service entrance, each feeder panelboard, each branch panelboard, and each separately derived source. The contractor shall redistribute single-phase loads where there is greater than a 20% difference between readings in any two phases. The contractor shall also be required to notify the COTR of current readings taken before and after installation, and any phase loaded above 80% of the rating of its overcurrent protective device.

5 Detailed Requirements

5.1 Electrical Surge Protection

All electrical surge protection systems shall be installed in accordance with the latest revision of FAA-

STD-019, LIGHTNING AND SURGE PROTECTION, GROUNDING, BONDING AND

SHIELDING REQUIREMENTS FOR FACILITIES AND ELECTRONIC EQUIPMENT (latest revision).

5.2 Wiring methods

5.2.1 General

All wiring shall consist of insulated copper conductors installed in metallic raceways, unless otherwise specified.

5.2.1.1 Conductor routing

Panelboards, surge protective devices, disconnect switches, etc., shall not be used as raceway for conductor routing other than conductors that originate or terminate in these enclosures. Per the NEC, grounding conductors for isolated ground receptacles will be allowed to pass through these enclosures as required.

5.2.1.2 Conductor separation

Power conductors, e.g. branch-circuit and feeder conductors, shall be routed separately from all non-power, e.g. signal, communication, etc. conductor types. This may be accomplished by routing power conductors and other conductors in separate raceways. Rated partitions in a common raceway may be used with documented FAA engineering approval.

5.2.2 Neutral conductor

Shared/common neutral conductors shall not be permitted, i.e., each overcurrent device shall have its own separate neutral conductor. Neutral conductor sizes shall not be less than the respective feeder or phase conductor sizes.

5.2.3 Raceway systems

5.2.3.1 General

Conduit interiors shall be visible clean of debris, and swabbed if necessary, before conductors are installed. Ends of raceway systems not terminated in boxes or cabinets shall be capped. Exposed raceways shall be installed parallel to or at right angles with the lines of the structure, with exceptions as approved by the COR. Crushed or deformed raceways shall not be installed. A pull wire shall be installed in all empty tubing and conduit systems in which wiring is to be installed by others. The pull wire shall be 14 AWG zinc-coated steel, or plastic with a minimum 200-pound tensile strength. A minimum of ten (10) inches of slack shall be left at each end of the pull wire. MULETAPE® of minimum 200-pound pull strength may also be used, with 36” left at each end of the wire pull.

Sections of raceways which pass through to damp, concealed, or underground locations shall be of a type allowed for such locations by NEC, and shall extend a minimum of 12 inches beyond the damp, concealed, or underground area. Where raceway has to be cut in the field, it shall be cut square and burrs and sharp edges removed. Where conduits penetrate walls or floors separating the building interior from the exterior, they shall be sealed to prevent moisture and rodent entry and to deter air transfer. In addition, where conduits penetrate walls separating individually controlled temperature or humidity controlled areas, they shall be sealed to prevent air circulation. Sealing methods and sealants shall be accordance with NEC. Where conduits penetrate fire- resistant-rated walls, partitions, floors, or ceilings, the conduit and openings shall be fire stopped using approved methods to maintain the fire resistance rating.

5.2.3.2 Conduit

5.2.3.2.1 General

Minimum conduit size for power distribution shall be 1/2 inch unless otherwise specified. Conduit for telephone and signal systems shall be allowed to be 1/2 inch.

Equipment such as HVAC DDC controls, Fire Alarm Control Panels, light fixtures, etc. are often furnished with 1/2 inch knock-outs. Trade Size 1/2 inch conduit will be permitted for final connection to this equipment. Reducing bushings shall be used as necessary.

Where threads have to be cut on conduit, the threads shall have the same effective length and shall have the same thread dimensions and taper as specified for factory cut threads on conduit.

5.2.3.2.2 Zinc coated ferrous rigid metal conduit

Zinc coated ferrous rigid metal conduit (RMC) shall conform to UL 6. Ferrous RMC may be used in all locations above and below grade, and shall be used for all underground service conductors. When used in corrosive environments, RMC shall have a protective coating of (1) Steel Structures Painting

Council Standard, SSPC-PS 10.01 Hot-Applied Coal Tar Enamel Painting System; or (2) PVC. The conduit shall extend at least 18” above grade or into the enclosure.

Elbows, couplings, and fittings used underground shall be protected as specified for conduit, or shall be field wrapped with 0.01-inch thick pipe wrapping plastic tape applied with 50% overlap. All fittings used with ferrous rigid metal conduit shall be the threaded type, of the same material as the conduit. Where conduits enter/exit exterior junction boxes from the top, a water-tight hub such as

Myers hub or equivalent connector shall be used. Where conduits enter enclosures without threaded hubs, double locknuts (one on each side of the enclosure wall) shall be used to securely bond the conduit to the enclosure. In addition, a grounding bushing shall be installed on the interior threaded end of the conduit to protect conductor insulation.

5.2.3.2.3 Intermediate metal conduit

Intermediate metal conduit (IMC) shall be zinc coated steel, shall conform to UL Standard 1242, and shall bear the UL label. Ferrous IMC may be used in all locations above grade and below grade.

When used in corrosive environments, IMC shall have a protective coating of (1) Steel Structures

Painting Council Standard, SSPC-PS 10.01 Hot-Applied Coal Tar Enamel Painting System; or (2)

PVC. The conduit shall extend at least 18” above grade or into the enclosure.

Elbows, couplings, and fittings used underground shall be protected as specified for conduit, or shall be field wrapped with 0.01-inch thick pipe wrapping plastic tape applied with 50% overlap. Where it is necessary to fabricate IMC bends in the field, the tooling required to fabricate those bends shall be specifically designed for IMC. All fittings shall be of the threaded type, of the same material as the conduit. Where conduits enter/exit exterior junction boxes from the top, a water-tight hub such as

Myers

TM

hub or equivalent connector shall be used. Where conduits enter enclosures without threaded hubs, double locknuts (one on each side of the enclosure wall) shall be used to securely bond the conduit to the enclosure. In addition, a grounding bushing shall be installed on the interior threaded end of the conduit to protect conductor insulation.

5.2.3.2.4 Electrical metallic tubing

Electrical metallic tubing (EMT) shall be steel and otherwise conform to UL 797. EMT may be used only in dry interior locations, and where not subject to physical damage. EMT shall not be used on circuits above 600 volts. The maximum size of EMT shall be trade size 4 (metric designator 103).

Previous versions of this document limited EMT to trade size 3 (metric designator 78) due to structural integrity issues. Fittings used with EMT shall be standard compression-type fittings designed for this type of EMT, unless otherwise indicated. Set screw-type fittings are not acceptable.

Where EMT enters enclosures without threaded hubs, an appropriate connector with threads and cast or machined (not sheet metal) locknut shall be used to securely bond the conduit to the enclosure. The connector body and locknut shall be installed so that firm contact is made on each side of the enclosure. In addition the connectors shall have an insulated-throat, smooth bell shaped end, or a grounding bushing.

5.2.3.2.5 Rigid aluminum conduit

Aluminum conduit shall not be used for any installation except by special permission. Non-ferrous condulets are acceptable.

5.2.3.2.6 Rigid nonmetallic conduit

Rigid nonmetallic conduit shall be Schedule 80 PVC conforming to UL 651. Schedule 40 PVC is permitted when encased in concrete. Rigid nonmetallic conduit used to protect electrical power conductors may only be used underground, or in concrete, or as a vertical riser to 6 inches above grade or floor surface for connection to metal conduit; and only when required by the contract drawings or specific job specifications. PVC fittings shall be used with PVC conduit and shall be assembled in accordance with manufacturer's instructions. A PVC threaded fitting with locknut and plastic bushing shall be used to connect PVC conduit to boxes or cabinets without threaded hubs. Rigid nonmetallic conduit may also be used to protect lightning protection system conductors and, in interior locations, to protect grounding conductors.

Sweeps and elbows in underground installations shall be RMC or IMC.

5.2.3.2.7 Flexible metal conduit, including Liquid-tight

Flexible metal conduit shall be ferrous and conform to Federal Specification, A-A-55810. Flexible metal conduit shall be used for terminal connections to motors or motor driven equipment, and in lengths only up to six (6) feet for other applications permitted by the NEC. A copper equipment grounding conductor (wire) shall be run with the circuit conductors; the conduit is not to be used as the equipment grounding conductor.

Liquid-tight flexible metal conduit shall be used outdoors and in wet locations.

Flexible metal conduit may be used under raised floor for branch circuits in lengths longer than six (6) feet in computer room locations that meet all the requirements of Article 645 of the NEC. Conduit, fittings and junction boxes installed under the raised floor shall be liquid tight types.

5.2.3.2.8 Flexible nonmetallic conduit

Flexible nonmetallic conduit shall not be used.

5.2.3.2.9 Surface raceways

Nonmetallic surface raceways shall not be used. Surface metal raceways shall conform to UL 5.

Surface metal raceways shall be installed only in exposed, dry locations not subject to physical damage. Surface metal raceways shall meet NEC requirements; however, they shall not be used for circuits above 600 volts.

5.2.3.3 Wireways

Wireways shall conform to UL 870. Wireways shall only be installed in accessible locations.

Wireways installed in wet or outdoor locations shall be rated for these locations.

5.2.3.4 Cable rack systems

5.2.3.4.1 General

Cable rack systems shall be of the ladder or ventilated trough type conforming to NEMA VE 1, unless otherwise indicated. All components for each cable rack system shall be fabricated with commercial off the shelf (COTS) components from a single manufacturer. Cable rack support spacing shall be as recommended by the manufacturer except that in no case shall spacing of supports exceed 6 feet.

Cable racks shall be supported from structural members only.

5.2.3.4.2 Dimensions

Straight sections, bends, tees, offsets, reducers, etc., for ladder-type cable rack systems shall consist of

3 inch minimum side channels with suitable cross channels (rungs) installed on 6 inch centers unless otherwise indicated. Straight sections, fittings, etc., for ventilated-type cable rack systems, shall have

3 inch minimum high sides and a ventilated bottom with cross pieces 2 inches (maximum) wide on 3 inch (maximum) centers and openings 2 inches (maximum) wide. Cable rack widths shall be as shown on the drawings.

5.2.4 Raceway support systems

5.2.4.1 General

Raceways shall be securely supported at intervals specified in the NEC Article 300.11, "Securing and

Supporting", and fastened in place with pipe straps, wall brackets, hangers, or ceiling trapezes.

Fastenings shall be by wood screws, nails or screw-type nails to wood; by toggle bolts on hollow masonry units; by expansion-bolts on concrete or brick; by machine screws, welded threaded studs, or spring tension clamps on steel work. Nail type nylon anchors or threaded studs driven by a power charge and provided with lock washers and nuts may be used in lieu of expansion bolts, machine screws, or wood screws. Threaded C clamps with retainers may be used. Raceways or pipe straps depth of more than 1-1/2 inch in reinforced concrete beams, or to a depth of more than 3/4 inch in reinforced concrete joists, shall not cut the main reinforcing bars. Holes not used shall be filled. In partitions of light steel construction, sheet-metal screws may be used. Raceways shall not be supported from sheet-metal roof decks. In suspended-ceiling construction, raceways shall not be fastened to the suspended-ceiling supports.

5.2.4.2 Telecommunication raceways

Telecommunication system raceways shall be installed in accordance with the previous requirements for conduit and tubing, with the additional requirements that no length of run shall exceed 50 feet for

1/2-inch and 3/4-inch sizes, and 100 feet for-1-inch or larger sizes; and shall not contain more than two 90-degree bends or the equivalent. Pull or junction boxes shall be installed to comply with these limitations, whether or not indicated on the drawings. Bends in conduit, 1 inch and larger, shall have minimum inside radii of 12 times the nominal conduit diameter.

5.2.5 Conductors

5.2.5.1 Uninsulated conductors

Uninsulated conductors shall be copper and in accordance with Federal Specification A-A-59551A.

5.2.5.2 Insulated conductors

Unless otherwise indicated insulated conductors shall be copper with thermoplastic or thermosetting insulation, type THW, THWN, and XHHW for general use, or type THHN for use in dry locations only, all insulated for 600 volts in accordance with Federal Specification A A 59544. Conductors sized 12 AWG and smaller for general use shall be solid. Stranded 12 AWG and smaller conductors are permitted when required for specific equipment installations. Conductors 10 AWG and larger may be stranded. Stranded conductors shall be UL Listed Class B. Minimum branch circuit conductor size shall be 12 AWG. If required specific equipment installations, stranded conductors finer than Class B may be used. Minimum control wire size shall be 14 AWG unless otherwise required by manufacturer or noted on drawings. Conductors 12 AWG and smaller are permitted to be stranded in applications where vibration and flexing may be encountered, with compression fittings installed at appropriate ends.

5.2.5.2.1 Fixture wiring

Fixture wiring shall be thermoplastic insulated copper, rated for 600 volts, in accordance with Federal

Specification A-A-59544 and the NEC.

5.2.5.2.2 Conductor identification

All feeder and branch circuits, including neutral conductors, shall be identified at both ends of the conductor with panel and circuit number indicated. This shall be accomplished using shrink embossed labels only. Equipment grounding conductors shall be color coded green. Conductors covered with green insulation with yellow, orange, violet or red tracers shall be used for other grounding systems. Neutral conductors shall be white insulated for 208/120Y and 120/240 volt systems, and gray insulated for 480/277Y volt systems. For conductors 4 AWG and larger, where appropriate insulation color is not available, color coded tape, half lapped for a minimum length of 3 inches shall be used. Switch leg conductors shall be consistently identified within a facility. All conductor color codes including re-identified conductors shall be visible at all junction boxes, pullboxes, panelboards, outlets, switches, at access locations in closed raceways, every three (3) feet in open raceways, under all raised floors and at all terminations.

5.2.5.2.3 Color Coding for Ungrounded Conductors

5.2.5.2.3.1 120, 120/240, 208Δ, 208/120Y Voltage Systems

Standard practice for FAA installations is (1) Black for 120 volt systems; (2) Black and Red for

120/240 volt systems; (3) Black (Phase A), Red (Phase B), and Blue (Phase C) for 208Δ and

208/120Y volt 3-phase systems. This color scheme is generally used within the United States.

5.2.5.2.3.2 480Δ, 480/277Y Voltage Systems

To ensure safety and proper operation of equipment, only one system shall be used within a facility.

For work at an existing facility, the color coding to be used shall match the existing facility color code.

For new FAA facilities, the FAA historical practice of Yellow-Brown-Orange for Phase A, B, C is preferred; local practice Brown-Orange-Yellow for Phase A, B, C is permitted. Phase conductor color coding shall be continuous throughout the facility on each phase conductor to its point of utilization so that the conductor phase connection is readily identifiable.

5.2.5.2.3.3 Direct Current Systems

Standard usage in the electrical, automotive and nautical arenas, including the approved National DC

Bus System equipment, is Red for DC Positive and Black for DC Negative. These standard colors shall be used for all FAA installations.

5.2.5.3 Connectors and Splices

Splices shall be made only at outlets, junction boxes or accessible raceways. Splicing of ungrounded conductors in panelboards is not permitted. All splices shall be accessible. Splices shall be made with solderless connectors conforming to UL 486A-486B, UL 486C, and UL 486E. Insulated wire nuts may only be used to splice conductors sized 10 AWG and smaller. Compression connectors shall be used to splice conductors 8 AWG and larger. All splices, including those made with insulated wire nuts, shall be insulated with electrical tape or shrink tubing to a level equal to that of the factory insulated conductors. All underground splicing shall be accomplished in accordance with

FAA-C-1391. To increase the reliability of power for NAS critical services, new feeder and branch conductors supporting these services shall not be spliced. Splices are not recommended, but may be used for modification work on existing systems. Where splices are used in other systems, such splices shall be approved by FAA in advance, and documented on facility drawings.

Connectors shall be listed for use with the conductors. Connectors for use with Class C and finer stranding shall be wire compression connectors or a pressure washer type lug; lugs with screw only compression are not allowed.

5.2.6 Metal-Clad Cable: Type MC

The installation of Metal-Clad Cable: Type (MC) installation must comply with the NEC. All metal-clad cable shall be UL listed with a steel sheath. Aluminum sheathing is not allowed. Both ends of the cable shall be terminated using UL-listed saddle or stirrup type fittings. Metal-Clad Cable shall include a separate internal equipment grounding conductor (wire);.the metallic sheath is not to be used as the equipment grounding conductor.

When installed in cable tray, the following conditions must also be met:

a. Type MC Cable shall be installed in metallic cable tray.

b. MC Cable shall be separated from communication, signal and control cables per

ANSI/TIA/EIA 569 Table 3.

c. The bend radius of Type MC Cable shall comply with applicable code and manufacturer guidance.

d. MC cable can be ran with other power conductors in accordance with code.

When installed in other than cable tray, or freely and supported as allowed by code:

a. Shall only be used in existing construction, or as otherwise permitted in writing for a specific use.

b. Shall only be used for branch circuits.

c. Shall only be used for essential and non-essential loads in limited access areas, such as wall cavities or ceilings, or as otherwise permitted in writing for a specific use.

5.3 Boxes

Boxes shall be either the cast-metal threaded-hub type conforming to UL 514A and UL5l4B, galvanized steel type conforming to UL 514A and UL 514B, or metal outlet boxes conforming to

NEMA OS 1. All enclosures shall conform to NEMA standards.

5.3.1 Applications

Boxes shall be provided in the wiring or raceway system for pulling wires, making connections, and mounting devices or fixtures. All outdoor boxes shall be rated suitable for the environment. In hazardous areas, boxes shall be rated suitable for the hazardous locations. Each electrical outlet box shall have a machine screw which fits into a tapped hole in the box for the ground connection. Boxes shall be sized in accordance with the NEC. Boxes for mounting lighting fixtures shall not be less than

4 inches square. Boxes installed for concealed wiring shall be provided with extension rings or plaster covers. The front edge of the box shall be flush or recessed not more than 1/4-inch from the finished wall surface. Boxes for use in masonry-block or tile walls shall be square-cornered tile-type, or standard boxes having square-cornered tile-type covers. Cast-metal boxes installed in wet locations and boxes installed flush with exterior surfaces shall be gasketed. Separate boxes shall be provided for flush or recessed fixtures where required by the fixture terminal operating temperature. Fixtures shall be readily removable for access to the boxes unless ceiling access panels are provided. Boxes for fixtures on suspended ceilings shall be supported independently of the ceiling supports. Boxes shall not be supported from sheet-metal roof decks. Non-metallic boxes may be used only with non-metallic raceway systems.

5.3.2 Supports

Boxes and supports shall be securely fastened to wood with wood screws, nails, screw-type nails, carriage bolts, or lag screws of equal holding strength, with bolts and expansion shields on concrete or brick, with toggle bolts on hollow masonry units, and with machine screws or welded studs on steel work. Support systems shall be capable of carrying the weight of the box and its contents. Threaded studs driven by powder charge and provided with lockwashers and nuts, or nail-type nylon anchors may be used in lieu of expansion shields, or machine screws. In open overhead spaces, cast-metal boxes threaded to raceways need not be separately supported except where used for fixture support;

cast-metal boxes having threadless connectors and sheet-metal boxes shall be supported directly from the building structure or by bar hangers. Where bar hangers are used, the bar shall be attached to raceways on opposite sides of the box and the raceway shall be supported with an approved fastener not more than 24 inches from the box. Penetration shall be no more than 1-1/2 inches into reinforced concrete beams or more than 3/4-inch into reinforced concrete joists. Main reinforcing steel shall not be cut.

5.4 Wiring devices

5.4.1 Receptacles

All receptacles shall be Federal Specification grade in accordance with W-C-596. Unless otherwise indicated, general purpose duplex receptacles shall be Federal Specification grade, 20 ampere rating, 125 volt, grounding type NEMA 5-20R. Receptacles with push-in connections or a combination of screw-type and push-in connectors are not acceptable. Unless noted otherwise, receptacles shall be installed 12 inches above finished floor. All receptacles, unless they are of the isolated-ground type, shall be grounded by the installation of a green grounding pigtail from the receptacle grounding screw directly to the grounding screw on the outlet box where the green equipment grounding conductor is terminated.

NOTE: For all critical power circuits, the receptacles shall be twist lock type except where the receptacles are not subject to be kicked or bumped (e.g., receptacles mounted inside an equipment rack). Electronic equipment installations often utilize plug strips that are do not have twist locks.

These are typically connected into a PDU which is then plugged into a twist lock.

5.4.1.1 Ground Fault Circuit-Interrupter receptacles

Ground fault circuit-interrupter (GFCI) receptacles shall be 125-volt, duplex, UL Group I, Class A, rated for 20 amperes minimum.

5.4.1.2 Multioutlet Assemblies

5.4.1.2.1 General

Fixed multi-outlet assemblies shall consist of a surface metal raceway with grounding type receptacles. Phase and neutral conductors shall not be smaller than 12 AWG and shall have the type of insulation specified for branch circuit conductors. In addition, a 12 AWG or larger green insulated equipment grounding conductor having the same insulation as the phase conductors shall be installed.

This grounding conductor shall connect all receptacle ground terminals and each section of the surface metal raceway, and shall be securely connected to the equipment grounding conductor from the branch power panel. Where more than one circuit is indicated as serving a group of similar receptacles in a common raceway, adjacent receptacles shall not be connected to the same circuit.

NOTE: Relocatable Power Taps / Temporary Power Taps are not covered by this standard.

5.4.1.2.2 Associated hardware

Surface metal raceways shall be provided with snap-on blank covers and/or snap-on receptacle covers for the receptacles furnished, all manufactured by the raceway manufacturer. They shall be installed to prevent open cracks. Where industry standard device plates are to be installed on raceways, snap-on blank covers shall be accurately cut to avoid open cracks. Fittings, elbows, clips, mounting straps, connection blocks, and insulators, shall be provided as required for a complete installation.

5.4.1.3 Emergency light receptacles

Emergency light receptacles shall be grounding type single receptacles in accordance with NEMA

WD 1.

5.4.2 Wall switches

Switching devices, such as single-pole, three-way, and four-way wall switches shall be Federal

Specification grade, rated 120/277 volts, and shall be fully rated 20 amperes, AC only. Wiring terminals shall be of the screw type. Switches with push-in connections or a combination of screw-type and push-in connections are not acceptable. Switches shall be equipped with grounding terminals and shall be grounded with a green grounding pigtail connected from the switch grounding screw directly to the grounding lug or screw on the outlet box where the green equipment grounding conductor is terminated. Switches shall be the quiet-operating type. Not more than one switch shall be installed in a single gang position.

5.4.3 Device plates

Plates of the one-piece type shall be provided for all outlets and fittings to suit the devices installed.

Plate screws shall be of metal with countersunk heads, in a color to match the finish of the plate.

Telephone and communication outlets shall be provided with a blank cover plate unless otherwise indicated. Plates shall be installed with all four edges in continuous contact with finished wall surfaces with the use of mats or similar devices. Plaster fillings will not be permitted. Plates shall be installed with an alignment tolerance of 1/16 inch. The use of sectional type device plates will not be permitted. Plates installed in wet locations shall be gasketed. Device plates for telephone and intercommunication outlets shall have a 3/8-inch bushed opening in the center or a dome-shaped grommet on the side.

5.5 Service equipment

5.5.1 Power

Service entrance equipment and installation for power shall be in accordance with the regulations of the Local utility providing service and NEC Article 230.

5.5.1.1 Service conduits

Service conduits shall be installed as shown on the drawings and shall be zinc coated ferrous rigid metal conduit unless otherwise indicated. Grounding bushings shall be installed on both ends of the service conduit.

5.5.1.1.1 Underground service

Underground service conduits shall be installed a minimum of 2 feet below finished grade. The conduit shall be bonded to the GES.

5.5.1.1.2 Aerial service

A minimum of 4 feet of slack in all service conductors shall be extended from an appropriate weatherproof entrance fitting to permit connection to the service drop. Conduit shall be concealed within the building where possible and conduit penetrations into the building shall be caulked with sealing compound.

5.5.1.2 Service disconnecting means

Service equipment shall be a fused disconnect switch, separately mounted circuit breaker, or main circuit breaker in the main distribution panel. All switches and circuit breakers used as service entrance disconnecting means shall be UL rated for service equipment.

5.5.2 Ground Fault Protection

Ground-fault protection of equipment shall be provided for solidly grounded wye electric services of more than 150 volts to ground but not exceeding 600 volts phase-to-phase for each service disconnect rated 1000 amperes or more, where required per NEC Article 230, VII Service Equipment —

Overcurrent Protection.

5.6 Panelboards

5.6.1 General

Panelboards shall be dead-front type, shall conform to Federal Specification W-P-115, Type I, Class

1, and shall be listed by UL except for installations which require special panelboards to incorporate items not available as UL listed. Unless otherwise specified, panelboards shall have a full hinged front cover with a hinged door in that cover for access to circuit breaker switches. Doors shall have flush type cylinder locks and catches. Doors over 48 inches in height shall have auxiliary fasteners on top and bottom. All locks in a project shall be keyed alike, and two keys shall be furnished with each lock. Directories shall be type written to indicate the load served by each circuit and shall be mounted on the inside of the door in a holder with a protective covering.