11_25R1303_26 20 00_Amd0008.pdf

FY24 MCON P-614 JOINT CONSOLIDATED COMMUNICATIONS CENTER 1737021

JOINT REGION MARIANAS, ANDERSEN AIR FORCE BASE

SECTION 26 20 00

INTERIOR DISTRIBUTION SYSTEM

08/23

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI C12.1 (2014; Errata 2016) Electric Meters - Code for Electricity Metering

ASTM INTERNATIONAL (ASTM)

ASTM B1 (2013) Standard Specification for Hard-Drawn Copper Wire

ASTM B8 (2023) Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft

ASTM D709 (2017) Standard Specification for Laminated Thermosetting Materials

MIL-HDBK-419 (1987; Rev A) Grounding, Bonding, and Shielding for Electronic Equipments and Facilities Volumes 1 of 2 Basic Theory MIL-STD-188-124 (1998; Rev B; Notice 2 1998; Notice 3 2000; Notice 4 2013) Grounding, Bonding and Shielding for Common Long Haul/Tactical Communications Systems, Including Ground Based Communications - Electronics Facilities and Equipments

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 81 (2012) Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System

IEEE C2 (2023) National Electrical Safety Code

IEEE Stds Dictionary (2009) IEEE Standards Dictionary: Glossary of Terms & Definitions

INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)

NETA ATS (2021) Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems

SECTION 26 20 00 Page 1

Amendment No. 0008 26 20 00 INTERIOR DISTRIBUTION SYSTEM, dated April 14, 2025

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

ANSI C12.20 (2015; E 2018) Electricity Meters - 0.1, 0.2, and 0.5 Accuracy Classes

ANSI C80.1 (2020) American National Standard for Electrical Rigid Steel Conduit (ERSC)

ANSI C80.3 (2020) American National Standard for Electrical Metallic Tubing (EMT)

ANSI C80.5 (2020) American National Standard for Electrical Rigid Aluminum Conduit

NEMA 250 (2020) Enclosures for Electrical Equipment (1000 Volts Maximum)

NEMA BU 1.1 (2010) General Instructions for Proper Handling, Installation, Operation and Maintenance of Busway Rated 600 V or Less

NEMA FU 1 (2012) Low Voltage Cartridge Fuses

NEMA ICS 1 (2022) Standard for Industrial Control and Systems: General Requirements

NEMA ICS 2 (2000; R 2020) Industrial Control and Systems Controllers, Contactors, and Overload Relays Rated 600 V

NEMA ICS 3 (2005; R 2010) Medium-Voltage Controllers Rated 2001 to 7200 V AC

NEMA ICS 4 (2015) Application Guideline for Terminal Blocks

NEMA ICS 6 (1993; R 2016) Industrial Control and Systems: Enclosures

NEMA ICS 7 (2020) Adjustable-Speed Drives

NEMA KS 1 (2013) Enclosed and Miscellaneous Distribution Equipment Switches (600 V Maximum)

NEMA MG 1 (2021) Motors and Generators

NEMA MG 10 (2017) Energy Management Guide for Selection and Use of Fixed Frequency Medium AC Squirrel-Cage Polyphase Induction Motors

NEMA MG 11 (1977; R 2012) Energy Management Guide for Selection and Use of Single Phase Motors

NEMA RN 1 (2005; R 2013) Polyvinyl-Chloride (PVC) Externally Coated Galvanized Rigid Steel Conduit and Intermediate Metal Conduit

SECTION 26 20 00 Page 2

NEMA ST 20 (2014) Dry-Type Transformers for General Applications

NEMA TC 2 (2020) Standard for Electrical Polyvinyl Chloride (PVC) Conduit

NEMA TC 3 (2021) Polyvinyl Chloride (PVC) Fittings for Use With Rigid PVC Conduit and Tubing

NEMA VE 2 (2018; ERTA 1-2 2018) Cable Tray Installation Guidelines

NEMA WD 1 (1999; R 2020) Standard for General Color Requirements for Wiring Devices

NEMA WD 6 (2021) Wiring Devices Dimensions Specifications

NEMA Z535.4 (2011; R 2017) Product Safety Signs and Labels

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2023; ERTA 4 2023; ERTA 5 2023; ERTA 6

2023) National Electrical Code

NFPA 70E (2024) Standard for Electrical Safety in the Workplace

NFPA 780 (2023) Standard for the Installation of Lightning Protection Systems

TELECOMMUNICATIONS INDUSTRY ASSOCIATION (TIA)

TIA-568.C-1 (2009) Commercial Building Telecommunications Cabling Standard

TIA-569 (2019e; Add 1 2022) Telecommunications Pathways and Spaces

TIA-607 (2019d) Generic Telecommunications Bonding and Grounding (Earthing) for Customer Premises

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

10 CFR 431 Energy Efficiency Program for Certain Commercial and Industrial Equipment

29 CFR 1910.147 The Control of Hazardous Energy (Lock Out/Tag Out)

29 CFR 1910.303 Electrical, General

UNDERWRITERS LABORATORIES (UL)

UL 1 (2005; Reprint Jan 2022) UL Standard for Safety Flexible Metal Conduit

SECTION 26 20 00 Page 3

UL 5A (2015; Reprint Aug 2020) Nonmetallic Surface Raceways and Fittings

UL 6 (2022) UL Standard for Safety Electrical Rigid Metal Conduit-Steel

UL 6A (2008; Reprint Mar 2021) UL Standard for Safety Electrical Rigid Metal Conduit - Aluminum, Red Brass, and Stainless Steel

UL 44 (2018; Reprint May 2021) UL Standard for Safety Thermoset-Insulated Wires and Cables

UL 50 (2015) UL Standard for Safety Enclosures for Electrical Equipment, Non-Environmental Considerations

UL 67 (2018; Reprint Aug 2023) UL Standard for Safety Panelboards

UL 83 (2017; Reprint Mar 2020) UL Standard for Safety Thermoplastic-Insulated Wires and Cables

UL 248-4 (2010; Reprint Apr 2019) Low-Voltage Fuses

- Part 4: Class CC Fuses

UL 248-8 (2011; Reprint Aug 2020) Low-Voltage Fuses

- Part 8: Class J Fuses

UL 248-10 (2011; Reprint Aug 2020) Low-Voltage Fuses

- Part 10: Class L Fuses

UL 248-12 (2011; Reprint Aug 2020) Low Voltage Fuses

- Part 12: Class R Fuses

UL 248-15 (2018) Low-Voltage Fuses - Part 15: Class T Fuses

UL 360 (2013; Reprint Apr 2023) UL Standard for Safety Liquid-Tight Flexible Metal Conduit

UL 467 (2022) UL Standard for Safety Grounding and Bonding Equipment

UL 486A-486B (2018; Reprint Jul 2023) UL Standard for Safety Wire Connectors

UL 486C (2018; Reprint May 2021) UL Standard for Safety Splicing Wire Connectors

UL 489 (2016; Rev 2019) UL Standard for Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

UL 498 (2017; Reprint May 2023) UL Standard for Safety Attachment Plugs and Receptacles

UL 506 (2017; Reprint Jan 2022) UL Standard for

SECTION 26 20 00 Page 4

Safety Specialty Transformers

UL 508 (2018; Reprint Jul 2021) UL Standard for Safety Industrial Control Equipment

UL 510 (2020; Dec 2022) UL Standard for Safety Polyvinyl Chloride, Polyethylene and Rubber Insulating Tape

UL 514A (2013; Reprint Jun 2022) UL Standard for Safety Metallic Outlet Boxes

UL 514B (2012; Reprint May 2020) Conduit, Tubing and Cable Fittings

UL 514C (2014; Reprint Feb 2020) UL Standard for Safety Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers

UL 651 (2011; Reprint May 2022) UL Standard for Safety Schedule 40, 80, Type EB and A Rigid PVC Conduit and Fittings

UL 797 (2007; Reprint Apr 2023) UL Standard for Safety Electrical Metallic Tubing -- Steel

UL 817 (2015; Reprint May 2023) UL Standard for Safety Cord Sets and Power-Supply Cords

UL 845 (2021) UL Standard for Safety Motor Control Centers

UL 854 (2020; Reprint Jan 2022) Standard for Service-Entrance Cables

UL 857 (2009; Reprint Apr 2021) UL Standard for Safety Busways

UL 869A (2006; Reprint Jun 2020) Reference Standard for Service Equipment

UL 943 (2016; Reprint Sep 2023) UL Standard for Safety Ground-Fault Circuit-Interrupters

UL 984 (1996; Reprint Sep 2005) Hermetic Refrigerant Motor-Compressors

UL 1063 (2017; Reprint Jun 2022) UL Standard for Safety Machine-Tool Wires and Cables

UL 1449 (2021; Reprint Dec 2022) UL Standard for Safety Surge Protective Devices

UL 1561 (2011; Reprint Aug 2023) Dry-Type General Purpose and Power Transformers

UL 1660 (2019; Reprint Jan 2022) Liquid-Tight Flexible Nonmetallic Conduit

SECTION 26 20 00 Page 5

UL 1699 (2017; Reprint Feb 2022) UL Standard for Safety Arc-Fault Circuit-Interrupters

UL 4248-1 (2022) UL Standard for Safety Fuseholders

- Part 1: General Requirements

UL 4248-12 (2018; Reprint Feb 2022) UL Standard for Safety Fuseholders - Part 12: Class R

1.2 DEFINITIONS

Unless otherwise specified or indicated, electrical and electronics terms used in these specifications, and on the drawings, are as defined in IEEE Stds Dictionary .

1.3 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for Contractor Quality Control approval. When used, a code following the "G" classification identifies the office that will review the submittal for the Government. Submittals with an "NN" designation identifies that NIWC and NCTS will review the submittal. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Panelboards; G

Transformers

Track Busway

Cable Trays; NN

Motor Control Centers

Marking Strips Drawings

SD-03 Product Data

Receptacles

Circuit Breakers

Switches

Transformers

Enclosed Circuit Breakers

Motor Controllers

CATV Outlets

Power Distribution Units

Surge Protective Devices

SECTION 26 20 00 Page 6

Telecommunications and CATV Grounding Busbar

SD-06 Test Reports

600-volt Wiring Test

Grounding System Test G

Transformer Tests; G

Ground-fault Receptacle Test

Arc-fault Receptacle Test; G

SD-07 Certificates

Fuses

SD-09 Manufacturer's Field Reports

Transformer Factory Tests

SD-10 Operation and Maintenance Data

Electrical Systems, Data Package 5; G

1.4 QUALITY ASSURANCE

1.4.1 Fuses

Submit coordination data as specified in paragraph, FUSES of this section.

1.4.2 Regulatory Requirements

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "must" had been substituted for "should" wherever it appears. Interpret references in these publications to the "authority having jurisdiction," or words of similar meaning, to mean the Contracting Officer. Provide equipment, materials, installation, and workmanship in accordance with NFPA 70 unless more stringent requirements are specified or indicated. .

1.4.3 Standard Products

Provide materials and equipment that are products of manufacturers regularly engaged in the production of such products which are of equal material, design and workmanship and:

a. Have been in satisfactory commercial or industrial use for 2 years prior to bid opening including applications of equipment and materials under similar circumstances and of similar size.

b. Have been on sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2-year period.

c. Where two or more items of the same class of equipment are required, provide products of a single manufacturer; however, the component parts of the item need not be the products of the same manufacturer unless stated in this section.

SECTION 26 20 00 Page 7

1.4.3.1 Alternative Qualifications

Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation for not less than 6000 hours, exclusive of the manufacturers' factory or laboratory tests, is furnished.

1.4.3.2 Material and Equipment Manufacturing Date

Products manufactured more than 3 years prior to date of delivery to site are not acceptable.

1.5 MAINTENANCE

1.5.1 Electrical Systems

Submit operation and maintenance data in accordance with Section 01 78 23, OPERATION AND MAINTENANCE DATA and as specified herein. Submit operation and maintenance manuals for electrical systems that provide basic data relating to the design, operation, and maintenance of the electrical distribution system for the building. Include the following:

a. Single line diagram of the "as-built" building electrical system.

b. Schematic diagram of electrical control system (other than HVAC, covered elsewhere).

c. Manufacturers' operating and maintenance manuals on active electrical equipment.

1.6 WARRANTY

Provide equipment items supported by service organizations that are reasonably convenient to the equipment installation in order to render satisfactory service to the equipment on a regular and emergency basis during the warranty period of the contract.

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

As a minimum, meet requirements of UL, where UL standards are established for those items, and requirements of NFPA 70 for all materials, equipment, and devices.

2.2 CONDUIT AND FITTINGS

Conform to the following:

2.2.1 Rigid Metallic Conduit

2.2.1.1 Rigid, Threaded Zinc-Coated Steel Conduit

ANSI C80.1 , UL 6 .

2.2.1.2 Rigid Aluminum Conduit

ANSI C80.5 , UL 6A .

SECTION 26 20 00 Page 8

2.2.2 Rigid Nonmetallic Conduit

PVC Type EPC-40 in accordance with NEMA TC 2, UL 651 .

2.2.3 Electrical, Zinc-Coated Steel Metallic Tubing (EMT)

UL 797 , ANSI C80.3 .

2.2.4 Plastic-Coated Rigid Steel

NEMA RN 1, Type 40( 40 mils thick).

2.2.5 Flexible Metal Conduit

UL 1 .

2.2.5.1 Liquid-Tight Flexible Metal Conduit, Steel

UL 360 .

2.2.6 Fittings for Metal Conduit, EMT, and Flexible Metal Conduit

UL 514B . Ferrous fittings: cadmium- or zinc-coated in accordance with

UL 514B .

2.2.6.1 Fittings for Rigid Metal Conduit

Threaded-type. Split couplings unacceptable.

2.2.6.2 Fittings for EMT

Die Cast or Steel compression type.

2.2.7 Fittings for Rigid Nonmetallic Conduit

NEMA TC 3 for PVC , and UL 514B .

2.2.8 Liquid-Tight Flexible Nonmetallic Conduit

UL 1660 .

2.2.9 Stainless Steel Conduit

Type 316L

UL 6A .

2.3 SURFACE RACEWAY

2.3.1 Surface Nonmetallic Raceway

UL 5A , nonmetallic totally enclosed, snap-cover type.

2.4 TRACK BUSWAY

NEMA BU 1.1 , UL 857 . Provide the following:

a. Buses: copper.

SECTION 26 20 00 Page 9

b. Busways: rated 600 volts, continuous current amperes as indicatated, three-phase, four-wire, and include integral or internal ground bus.

c. Short circuit rating: 22,000 root mean square (rms) symmetrical amperes minimum.

d. Busway systems: suitable for use indoors.

e. Enclosures: aluminum.

f. Hardware: plated or otherwise protected to resist corrosion.

g. Joints: one-bolt type with through-bolts, which can be checked for tightness without de-energizing system.

h. Maximum hot spot temperature rise at any point in busway at continuous rated load: do not exceed 55 degrees C above maximum ambient temperature of 40 degrees C in any position.

i. Internal barriers to prevent movement of superheated gases.

j. Coordinate proper voltage phasing of entire bus duct system, for example where busway interfaces with transformers, switchgear, switchboards, motor control centers, and other system components.

2.4.1 Plug-In Busways

Unventilated type. Provide the following:

a. Plug-in units: circuit breaker-type.

b. Bus bars: covered with insulating material throughout, except at joints and other connection points.

c. A hook stick of suitable length for operating plug-in units from the floor.

2.5 CABLE TRAYS

a. Cable trays: form a wireway system, with a nominal size as indicated.

b. Cable trays: aluminum ladder type in electrical rooms, stainless steel type on the roof, steel ladder type in telecommunications rooms and equipment rooms when mounted overhead and welded wire type in all other areas. Welded wire type may be aluminum, copper-free aluminum, or steel that has been zinc-coated after fabrication.

c. Cable trays: include splice and end plates, dropouts, and miscellaneous hardware.

d. Edges, fittings, and hardware: finished free from burrs and sharp edges.

e. Fittings: ensure not less than load-carrying ability of straight tray sections and have manufacturer's minimum standard radius.

f. Radius of bends: 24 inches as per manufacturer's recommendation.

SECTION 26 20 00 Page 10

g. Dropouts: Above each cabinet, provide a minimum of one cable dropout from overhead cable tray and overhead cable trough.

2.5.1 Fiber Trough

Provide size as indicated

Trough must include all necessary channel, fittings, drop outs, and brackets for a complete system. Material must be PVC. UL 2024A. All fittings and drop outs must be manufactured products. Field fabricated fittings and dropouts is not acceptable. Use Yellow certified UL 94V-0 fire-retardant ABS plastic troughs for fiber-optic cable only. Do not use for other cable types.

2.5.2 Ladder-Type Cable Trays

Provide width and side wall height as indicated with maximum rung spacing of 9 inches. Ladder type cable tray shall include all necessary tray, fittings, drop outs, and brackets for a complete system. All fittings and drop outs shall be manufactured products. Field fabricated fittings and drop outs is not acceptable. Cable tray must be suitable for use as an equipment grounding conductor.

2.5.3 Overhead Telecommunications Ladder-Type Cable Tray

Overhead Cable tray shall be a heavy duty, flat top, ladder rack style pathway system design for use in telecommunication rooms and equipment rooms. Runway construction shall consist of 1 1/2 inches by 3/8 inch tubular stringers with 5/8 inch by 1 inch welded rungs at 8 7/8 inch intervals. Minimum width shall be as indicated. Equipped with metal dropouts where cables feed to equipment racks or cabinets. All fittings and drop outs shall be manufactured products. Field fabricated fittings and dropouts is not acceptable.

2.5.4 Welded Wire Basket Type Cable Trays

Provide size as indicated. Basket type cable trays shall include all necessary tray, fittings, drop outs, and brackets for a complete system.

Maximum wire mesh spacing shall be 2 by 4 inch. All fittings and drop outs shall be manufactured products. Field fabricated fittings and drop outs is not acceptable.

2.6 OPEN TELECOMMUNICATIONS CABLE SUPPORT

2.6.1 Miscellaneous Requirements

All Telecommunications and Data cabling shall be in cable trays or in conduit. Use of open-top or closed-ring cable supports (e.g. J-Hooks, J-Supports and D-Rings) is not permitted. Conduits for telecommunications and Data cabling shall be run to cable trays and bonded to the cable tray system.

2.7 OUTLET BOXES AND COVERS

UL 514A , cadmium- or zinc-coated, if ferrous metal. UL 514C , if nonmetallic.

SECTION 26 20 00 Page 11

2.7.1 Floor Outlet Boxes

Provide the following:

a. Boxes: adjustable and concrete tight.

b. Each outlet: consisting of nonmetallic body with threaded openings, for conduits, adjustable ring, and cover plate with threaded plug.

c. Telecommunications outlets: consisting of aluminum or stainless steel housing with a receptacle as specified and conduit openings as noted on drawing.

d. Receptacle outlets: consisting of surface-mounted, horizontalor flush, as noted on drawings, aluminum or stainless steel housing with duplex-type receptacle as specified herein.

e. Provide gaskets where necessary to ensure watertight installation.

2.7.2 Outlet Boxes for Telecommunications System

Provide the following:

a. Standard type 4 11/16 inches square by 2 1/8 inches deep.

b. Depth of boxes: large enough to allow manufacturers' recommended conductor bend radii.

c. Outlet boxes for fiber optic telecommunication outlets: include a minimum 3/8 inch deep single or two gang plaster ring as shown and installed using a minimum one inch conduit system.

2.7.3 Outlet Boxes for Exterior and Unconditioned Spaces

Provide the following:

a. Standard type 4 11/16 inches square by 2 18/ inches deep.

b. UL 943 rated.

c. 316L Stainless Steel Weather proof, corrosion resistant, compliant with NEC 409.6(B)(1) "Extra Duty" rating.

d. Tamper resistant, compliant with NEC 406.12.

2.8 CABINETS, JUNCTION BOXES, AND PULL BOXES

UL 50 ; volume greater than 100 cubic inches, NEMA Type 1 enclosure; sheet steel, hot-dip, zinc-coated. Where exposed to wet, damp, or corrosive environments, NEMA Type 4X.

2.9 WIRES AND CABLES

Provide wires and cables in accordance applicable requirements of NFPA 70 and UL for type of insulation, jacket, and conductor specified or indicated. Do not use wires and cables manufactured more than 24 months prior to date of delivery to site.

SECTION 26 20 00 Page 12

2.9.1 Conductors

Provide the following:

a. Conductor sizes and capacities shown are based on copper, unless indicated otherwise.

b. Conductors No. 8 AWG and larger diameter: stranded.

c. Conductors No. 10 AWG and smaller diameter: stranded, except receptabcle branch circuits, which whall be installed using solid conductors..

d. Conductors for remote control, alarm, and signal circuits, classes 1, 2, and 3: stranded unless specifically indicated otherwise.

e. All conductors: copper.

2.9.1.1 Minimum Conductor Sizes

Provide minimum conductor size in accordance with the following:

a. Branch circuits: No. 12 AWG.

b. Class 1 remote-control and signal circuits: No. 14 AWG.

c. Class 2 low-energy, remote-control and signal circuits: No. 16 AWG.

d. Class 3 low-energy, remote-control, alarm and signal circuits: No. 22

AWG.

2.9.2 Color Coding

Provide color coding for service, feeder, branch, control, and signaling circuit conductors.

2.9.2.1 Ground and Neutral Conductors

Provide color coding of ground and neutral conductors as follows:

a. Grounding conductors: Green.

b. Neutral conductors: White.

c. Exception, where neutrals of more than one system are installed in same raceway or box, other neutrals color coding: white with a different colored (not green) stripe for each.

2.9.2.2 Ungrounded Conductors

Provide color coding of ungrounded conductors in different voltage systems as follows:

a. 208/120 volt, three-phase

(1) Phase A - black

(2) Phase B - red

SECTION 26 20 00 Page 13

(3) Phase C - blue

b. 480/277 volt, three-phase

(1) Phase A - brown

(2) Phase B - orange

(3) Phase C - yellow

c. 120/240 volt, single phase: Black and red

2.9.3 Insulation

Unless specified or indicated otherwise or required by NFPA 70 , provide power and lighting wires rated for 600-volts, Type THWN/THHN conforming to UL 83 , except that grounding wire may be type TW conforming to UL 83 ;

remote-control and signal circuits: Type TW or TF, conforming to UL 83 .

Where equipment or devices require 90-degree Centigrade conductors, provide only conductors with 90-degree C insulation or better.

2.9.4 Bonding Conductors

ASTM B1, solid bare copper wire for sizes No. 8 AWG and smaller diameter;

ASTM B8, Class B, stranded bare copper wire for sizes No. 6 AWG and larger diameter.

2.9.4.1 Telecommunications Bonding Backbone (TBB)

Provide a copper conductor TBB in accordance with TIA-607 with No. 6 AWG minimum size, and sized at 2 kcmil per linear foot of conductor length up to a maximum size of 3/0 AWG.

2.9.4.2 Bonding Conductor for Telecommunications

Provide a copper conductor Bonding Conductor for Telecommunications between the telecommunications primary bonding busbar (PBB) and the electrical service ground in accordance with TIA-607 . Provide grounding per MIL-STD-188-124 and MIL-HDBK-419 Volume I and II. Grounding must include copper mesh embedded in the floor and ground floor plates below the equipment rooms and telecommunication rooms. One auxiliary busbar must be located in each of the telecommunication rooms. Refer to drawings for details.

2.9.5 Service Entrance Cables

Service Entrance (SE) and Underground Service Entrance (USE) Cables, UL 854 .

2.9.6 Cable Tray Cable or Power Limited Tray Cable

UL listed; type TC or PLTC.

2.9.6.1 VFD Cable

UL listed; 300% ground; conforming to NEMA ICS 7 and NFPA 70.

2.9.7 Cord Sets and Power-Supply Cords

UL 817 .

SECTION 26 20 00 Page 14

2.10 SPLICES AND TERMINATION COMPONENTS

UL 486A-486B for wire connectors and UL 510 for insulating tapes.

Connectors for No. 10 AWG and smaller diameter wires: insulated, pressure-type in accordance with UL 486A-486B or UL 486C (twist-on splicing connector). Provide solderless terminal lugs on stranded conductors.

2.11 DEVICE PLATES

Provide the following:

a. UL listed, one-piece device plates for outlets to suit the devices installed.

b. For metal outlet boxes, plates on unfinished walls: zinc-coated sheet steel or cast metal having round or beveled edges.

c. For nonmetallic boxes and fittings, other suitable plates may be provided.

d. Plates on finished walls: brushed finished stainless steel except for plated steel in the mechanical support areas.

e. Screws: machine-type with countersunk heads in color to match finish of plate.

f. Sectional type device plates are not be permitted.

g. Plates installed in wet locations: gasketed and UL listed for "wet locations."

2.12 SWITCHES

2.12.1 Switch with Red Pilot Handle

NEMA WD 1. Provide the following:

a. Pilot lights that are integrally constructed as a part of the switch's handle.

b. Pilot light color: red and illuminate whenever the switch is closed or "on".

c. Pilot lighted switch: rated 20 amps and 120 volts or 277 volts as indicated.

d. The circuit's neutral conductor to each switch with a pilot light.

2.12.2 Breakers Used as Switches

For 120- and 277-Volt fluorescent fixtures, mark breakers "SWD" in accordance with UL 489 .

2.12.3 Disconnect Switches

NEMA KS 1. Provide heavy duty-type switches where indicated, where switches are rated higher than 240 volts, and for double-throw switches.

SECTION 26 20 00 Page 15

Utilize Class R fuseholders and fuses for fused switches, unless indicated otherwise. Provide horsepower rated for switches serving as the motor-disconnect means. Provide switches in NEMA 1or 4X Type 304 stainless steel enclosure per NEMA ICS 6 .

2.12.3.1 Emergency Power off Switches

Provide emergency power off switches rated 10 amps@120VAC with a minimum of two auxiliary contacts. The switches must have clear protective pull-up covers to mitigate accidental powering off of equipment.

2.13 FUSES

NEMA FU 1. Provide complete set of fuses for each fusible switch.

Coordinate time-current characteristics curves of fuses serving motors or connected in series with circuit breakers or other circuit protective devices for proper operation. Submit coordination data for approval.

Provide fuses with a voltage rating not less than circuit voltage.

2.13.1 Fuseholders

Provide in accordance with UL 4248-1 .

2.13.2 Cartridge Fuses, Current Limiting Type (Class R)

UL 248-12 , Class RK-1. Provide only Class R associated fuseholders in accordance with UL 4248-12 .

2.13.3 Cartridge Fuses, High-Interrupting Capacity, Current Limiting Type (Classes J, L, and CC)

UL 248-8 , UL 248-10 , UL 248-4 , Class J for zero to 600 amperes, Class L for 601 to 6,000 amperes, and Class CC for zero to 30 amperes.

2.13.4 Cartridge Fuses, Current Limiting Type (Class T)

UL 248-15 , Class T for zero to 1,200 amperes, 300 volts; and zero to 800 amperes, 600 volts.

2.14 RECEPTACLES

Provide the following:

a. UL 498 , general purpose specification grade,, grounding-type.

Residential grade receptacles are not acceptable.

b. Ratings and configurations: as indicated.

c. Bodies: ivory as per NEMA WD 1.

d. Face and body: thermoplastic supported on a metal mounting strap.

e. Dimensional requirements: per NEMA WD 6.

f. Screw-type, side-wired wiring terminals or of the solderless pressure type having suitable conductor-release arrangement.

g. Grounding pole connected to mounting strap.

SECTION 26 20 00 Page 16

h. The receptacle: containing triple-wipe power contacts and double or triple-wipe ground contacts.

i. Controlled receptacles: as required per ASHRAE 90.1. Provide marking for controlled receptacle per NFPA 70 .

j. Labeling: Provide laser engraved labeling on faceplate indicating the following: Circuit; Occupancy Sensor Controlled (if applicable); Power Source (if located inside the Comm building. Comm building receptacles must be labeled on of the following: Non-critical power A bus, Non-critical power B bus, Critical power A bus, Critical Power B bus).

Each of the above listed items must be printed on a separate line with 3/16" nominal text height.

2.14.1 Split Duplex Receptacles

Provide separate terminals for each ungrounded pole. One receptacle must be controlled separately.

2.14.2 Weatherproof Receptacles

Provide receptacles, UL listed for use in "wet locations" with integral GFCI protection and identified as "Extra Duty" per NEC Article 406.9.

Compliant with NEC 406.12 for Tamper Resistance. Include cast metal box with gasketed, hinged, lockable and weatherproof while-in-use, polycarbonate, UV resistant/stabilized extra-duty rated hood. Do not impede on hinged covers of outlet box hoods such that they are capable of opening at least 90 degrees, or fully open if the cover is not designed to open 90 degrees, after installation. All exterior GFCI receptacles to be corrosion resistant.

2.14.3 Ground-Fault Circuit Interrupter Receptacles

UL 943 , duplex type for mounting in standard outlet box. Provide device capable of detecting current leak when the current to ground is 6 milliamperes or higher, and tripping per requirements of UL 943 for Class A ground-fault circuit interrupter devices. Provide screw-type, side-wired wiring terminals or pre-wired (pigtail) leads.

2.14.4 Plugs

Provide heavy-duty, rubber-covered wire cord of required sizeand configuration as noted on drawings. Provide UL listed plugs with receptacles, complete with grounding blades. Where equipment is not available, turn over plugs and cord assemblies to the Government.

2.15 PANELBOARDS

Provide panelboards in accordance with the following:

a. UL 67 and UL 50 having a short-circuit current rating as indicated.

b. Panelboards for use as service disconnecting means: additionally conform to UL 869A .

c. Panelboards: circuit breaker-equipped.

d. Designed such that individual breakers can be removed without disturbing adjacent units or without loosening or removing

SECTION 26 20 00 Page 17 supplemental insulation supplied as means of obtaining clearances as required by UL.

e. "Specific breaker placement" is required in panelboards to match the breaker placement indicated in the panelboard schedule on the design drawings.

f. Use of "Subfeed Breakers" is not acceptable.

g. Main breaker: "separately" mounted "above" or "below" branch breakers.

Include barrier for line side terminals as required by NEC article 215.15.

h. Where "space only" is indicated, make provisions for future installation of breakers.

i. Directories: indicate load served by each circuit in panelboard.

j. Directories: indicate source of service to panelboard (e.g., Panel PA served from Panel MDP).

k. Type directories and mount in holder behind transparent protective covering.

l. Panelboards: listed and labeled for their intended use.

m. Panelboard nameplates: provided in accordance with paragraph FIELD

FABRICATED NAMEPLATES.

2.15.1 Enclosure

Provide panelboard enclosure in accordance with the following:

a. UL 50 .

b. Cabinets mounted outdoors or flush-mounted: hot-dipped galvanized after fabrication.

c. Cabinets: painted in accordance with paragraph FIELD APPLIED PAINTING.

d. Indoor Cabinets: NEMA 1 for the communications building.

e. Outdoor cabinets: NEMA 4x with a removable steel plate 1/4 inch thick in the bottom for field drilling for conduit connections.

f. Front edges of cabinets: form-flanged or fitted with structural shapes welded or riveted to the sheet steel, for supporting the panelboard front.

g. All cabinets: fabricated such that no part of any surface on the finished cabinet deviates from a true plane by more than 1/8 inch.

h. Holes: provided in the back of indoor surface-mounted cabinets, with outside spacers and inside stiffeners, for mounting the cabinets with a 1/2 inch clear space between the back of the cabinet and the wall surface.

i. Flush doors: mounted on hinges that expose only the hinge roll to view when the door is closed.

SECTION 26 20 00 Page 18

j. Each door: fitted with a combined catch and lock latch.

k. Keys: two provided with each lock, with all locks keyed alike.

l. Finished-head cap screws: provided for mounting the panelboard fronts on the cabinets.

2.15.2 Panelboard Buses

Support bus bars on bases independent of circuit breakers. Design main buses and back pans so that breakers may be changed without machining, drilling, or tapping. Provide isolated neutral bus in each panel for connection of circuit neutral conductors. Provide separate ground bus identified as equipment grounding bus per UL 67 for connecting grounding conductors; bond to steel cabinet.

2.15.3 Circuit Breakers

UL 489 , thermal magnetic-type having a minimum short-circuit current rating equal to the short-circuit current rating of the panelboard in which the circuit breaker will be mounted. Breaker terminals: UL listed as suitable for type of conductor provided. Where indicated on the drawings, provide circuit breakers with shunt trip devices. Series rated circuit breakers and plug-in circuit breakers are unacceptable.

2.15.3.1 Multipole Breakers

Provide common trip-type with single operating handle. Design breaker such that overload in one pole automatically causes all poles to open.

Maintain phase sequence throughout each panel so that any three adjacent breaker poles are connected to Phases A, B, and C, respectively.

2.15.3.2 Circuit Breaker With Ground-Fault Circuit Interrupter

UL 943 and NFPA 70 . Provide with auto-monitoring (self-test) and lockout features, "push-to-test" button, visible indication of tripped condition, and ability to detect and trip when current imbalance is 6 milliamperes or higher per requirements of UL 943 for Class A ground-fault circuit interrupter devices.

2.15.3.3 Arc-Fault Circuit Interrupters

UL 489 , UL 1699 and NFPA 70 . Molded case circuit breakers: rated as indicated. Provide with "push-to-test" button.

2.15.4 Panelboard Submetering

Where shown on the drawings, provide a UL listed micropocessor-based metering system for metering branch circuits with the following features:

a. Meters must have 60 channels for current sensor input. Meter must auto-detect sensor rating and have standard tamper detection.

b. Meters must calculate power and energy consumption in accordance with ANSI C12.20 (0.5%) metering specification and store metered data in nonvolatile memory

c. Meters must store the following per phase and system total for each

SECTION 26 20 00 Page 19 metering point:

(1) Voltage, Current, and Frequency (system total only)

(2) Watts, VAR, VA, and Power Factor.

(3) Watt hours including forward and reverse.

d. Meters must store energy profile information for each metering point in non-volatile memory. The demand profile time period must be adjustable form 1, 5, 15, 30, and 60 minutes for fixed method and 1, 5, and 15 minutes for sliding method. The meters must have the ability to sync with external input to the on board demand input. The meters must be able to save a minimum of 1 year of load profile data for all 60 meter points on a 15 minute basis.

e. Meters must be provided with multiple communications ports and protocols, including the following capability:

(1) RS-485 remote display port

(2) RS-485 Modbus RTU

(3) Modbus TCP

(4) BACnet/IP

2.16 POWER DISTRIBUTION UNITS

Provide power distribution units (PDUs) in accordance with the following:

a. Main cabinet must be NEMA Type 1 enclosure.

b. Each Distribution output section must have separate top and bottom output modules or a full-section combined (top and bottom) output module. A single top module or bottom module shall consist of a set of subfeed circuit breakers. A full section module (top and bottom combined module for large components) shall consist of 84-pole panelboards, larger 42-pole panelboards, or a set of subfeeds. A module must contain a panelboard or a set of subfeed circuit breakers. Standard circuit breakers are 80% rated; 100% rated circuit breakers are also available.

c. The PDU must contain an internally powered 120VAC shunt trip mechanism to operate a local Emergency Power Off (EPO) and to effectively interface with the monitoring system. Each PDU must have a common EPO circuit, designed to accept a normally open (NO) dry contact signal. A 24VDC remote shunt trip signal must be available to interface with Remote Emergency Power Off (REPO) stations.

d. The PDU must contain a manual restart circuit to protect the connected load during a system restart sequence. A circuit must be provided to allow this feature to be field-deactivated.

e. All Remote Emergency Power Off, building alarms, output relays, communication ports, and other control wiring must be terminated onto a contractor board within the PDU. The contractor board must contain REPO connections, four relay contacts (NO contacts to

SECTION 26 20 00 Page 20 include summary alarm), four building alarm contacts, and remote monitoring connection ports (Modbus RTU TCP/IP.

f. The PDU must allow for the mounting of a 7" diagonal color monitor on the front of the monitoring compartment. The color monitor must be capable of displaying monitoring information from the PDU board, contractor board, and all distribution output subfeeds and panelboards.

g. The PDU must include a single Surge Protective Device (SPD) or

Transient Voltage Surge Suppressor (TVSS) rated 100 kA or 200 kA on the input or output to the panelboard. The SPD must incorporate a remote signaling dry contact. The SPD status lights must be visible through the front input compartment door.

h. PDUs must be supplied with stand for mounting to true floor, not raised access flooring.

i. Low-voltage monitoring components must be accessible without exposure to high-voltage components. Low- and high-voltage components must be segregated into separate compartments in the main cabinet.

j. The main cabinet must have three (3) compartments:

1) Input compartment for the main input circuit breaker and SPD/TVS.

2) Distribution output section for output subfeeds

3) Monitoring compartment for a color monitor, branch circuit monitoring system, and related components.

k. The PDU must be convection cooled and have no fans. Heat rejection must be through ventilation openings. Convection cooling must be sufficient for full load operation.

l. The PDU must include a single point ground in accordance with FIPS Pub 94 and the requirements of the NEC. Each distribution output section must have a ground busbar for distribution output subfeeds and panelboard ground strips.

m. The PDU must have a 200%-rated neutral copper busbar as standard in each distribution output section or must allow for a smaller percentage rated neutral if required.

n. The PDU must allow for both top and bottom cable entry/exit.

o. The PDU must be fed from an integral 3-phase, copper-wound, high isolation standard transformer rated between 100 kVA and 400 kVA. The transformer must be specifically designed for the PDU and its applications and provides voltage transformation, voltage adjustment, high isolation, conditioning, and shielding. Each transformer must be complete with electrostatic shielding and must use a universal footing template inside the PDU to secure the transformer to its base. The transformer must be K-20 rated.

p. The PDU must have a 600V, 480V, or 400V thermal-magnetic main input circuit breaker with optional electronic trip. The breaker must be manually operated and sized in compliance with NEC 2023.1) The main input breaker must have the following kAIC ratings: 480V@65 kAIC.2)

SECTION 26 20 00 Page 21

The main input bus must also be compatible with a main lug only (MLO) power feed.

2.17 ENCLOSED CIRCUIT BREAKERS

UL 489 . Individual molded case circuit breakers with voltage and continuous current ratings, number of poles, overload trip setting, and short circuit current interrupting rating as indicated. Enclosure type as indicated. Provide solid neutral.

2.18 MOTOR SHORT-CIRCUIT PROTECTOR (MSCP)

Motor short-circuit protectors, also called motor circuit protectors (MCPs): UL 508 and UL 489 , and provided as shown. Provide MSCPs that consist of an adjustable instantaneous trip circuit breaker used only in conjunction with a combination motor controller which provides coordinated motor branch-circuit overload and short-circuit protection. Rate MSCPs in accordance with the requirements of NFPA 70 .

2.19 TRANSFORMERS

Provide transformers in accordance with the following:

a. NEMA ST 20 , general purpose, dry-type, self-cooled ventilated.

b. Provide transformers in NEMA 1 enclosure.

c. Taps for transformers 15 kVA and larger: Two 2.5 percent taps Full Capacity Above Nominal (FCAN) and two 2.5 percent taps Full Capacity Below Nominal (FCBN).

d. Transformer insulation system:

(1) 220 degrees C insulation system for transformers 15 kVA and greater, with temperature rise not exceeding 115 degrees C under full-rated load in maximum ambient of 40 degrees C.

(2) 180 degrees C insulation for transformers rated 10 kVA and less, with temperature rise not exceeding 80 degrees C under full-rated load in maximum ambient of 40 degrees C.

e. Transformer of 150 degrees C temperature rise is not acceptable.

f. Transformer of 115 degrees C temperature rise: capable of carrying continuously 115 percent of nameplate kVA without exceeding insulation rating.

g. Transformers: quiet type with maximum sound level at least 3 decibels less than NEMA standard level for transformer ratings indicated.

2.19.1 Specified Transformer Efficiency

Transformers, indicated and specified with: 480V primary, 80 degrees C or 115 degrees C temperature rise, kVA ratings of 37.5 to 100 for single phase or 30 to 500 for three phase, energy efficient type. The transformer is not acceptable if the calculated transformer efficiency is less than the efficiency indicated in 10 CFR 431 , Subpart K.

SECTION 26 20 00 Page 22

2.19.2 K-Rated Transformers

Provide K-rated transformers for non-linear loads in accordance with the following:

a. Transformer insulation: UL recognized 220 degrees C system. Neither the primary nor the secondary temperature is allowed to exceed 220 degrees C at any point in the coils while carrying their full rating of non-sinusoidal load.

b. Transformers are to be UL listed and labeled for K-Factor rating as indicated in accordance with UL 1561 .

c. Transformers evaluated by the UL K-Factor evaluation: listed for 115 degrees C average temperature rise only.

d. Transformers with K-Factor ratings with temperature rise of 150 degrees C rise are not acceptable.

e. K-Factor rated transformers impedance: allowed range of 3 percent to 5 percent, with a minimum reactance of 2 percent to prevent excessive neutral current when supplying loads with large amounts of third harmonic.

2.20 MOTORS

Provide motors in accordance with the following:

a. NEMA MG 1

b. Hermetic-type sealed motor compressors: Also comply with UL 984 .

c. Provide the size in terms of HP, or kVA, or full-load current, or a combination of these characteristics, and other characteristics, of each motor as indicated or specified.

d. Determine specific motor characteristics to ensure provision of correctly sized starters and overload heaters.

e. Rate motors for operation on 208-volt, 3-phase circuits with a terminal voltage rating of 200 volts, and those for operation on 480-volt, 3-phase circuits with a terminal voltage rating of 460 volts.

f. Use motors designed to operate at full capacity with voltage variation of plus or minus 10 percent of motor voltage rating.

g. Unless otherwise indicated, use continuous duty type motors if rated 1 HP and above.

h. Where fuse protection is specifically recommended by the equipment manufacturer, provide fused switches in lieu of non-fused switches indicated.

i. Use Inverter-Duty motors designed to operate with adjustable speed drive (ASD).

SECTION 26 20 00 Page 23

2.20.1 High Efficiency Single-Phase Motors

Single-phase fractional-horsepower alternating-current motors: high efficiency types are not acceptable. In exception, for special purpose motors and motor-driven equipment with a minimum seasonal or overall efficiency rating, such as a SEER rating, provide equipment with motor to meet the overall system rating indicated.

2.20.2 Premium Efficiency Polyphase and Single-Phase Motors

Select polyphase and continuous-duty single phase motors based on high efficiency characteristics relative to typical characteristics and applications as listed in NEMA MG 10 and NEMA MG 11. In addition, continuous rated, polyphase squirrel-cage medium induction motors must meet the requirements for premium efficiency electric motors in accordance with NEMA MG 1, including the NEMA full load efficiency ratings. In exception, for motor-driven equipment with a minimum seasonal or overall efficiency rating, such as a SEER rating, provide equipment with motor to meet the overall system rating indicated.

2.20.3 Motor Sizes

Provide size for duty to be performed, not exceeding the full-load nameplate current rating when driven equipment is operated at specified capacity under most severe conditions likely to be encountered. When motor size provided differs from size indicated or specified, make adjustments to wiring, disconnect devices, and branch circuit protection to accommodate equipment actually provided. Provide controllers for motors rated 1-hp and above with electronic phase-voltage monitors designed to protect motors from phase-loss, undervoltage, and overvoltage. Provide protection for motors from immediate restart by a time adjustable restart relay.

2.20.4 Wiring and Conduit

Provide internal wiring for components of packaged equipment as an integral part of the equipment. Provide power wiring and conduit for field-installed equipmentas specified herein. Power wiring and conduit:

conform to the requirements specified herein. Control wiring: provided under, and conform to, the requirements of the section specifying the associated equipment.

2.21 MOTOR CONTROLLERS

Provide motor controllers in accordance with the following:

a. UL 508 , NEMA ICS 1 , and NEMA ICS 2

b. Provide controllers with thermal overload protection in each phase, and one spare normally open auxiliary contact, and one spare normally closed auxiliary contact.

c. Provide controllers for motors rated 1-hp and above with electronic phase-voltage monitors designed to protect motors from phase-loss, undervoltage, and overvoltage.

d. Provide protection for motors from immediate restart by a time adjustable restart relay.

SECTION 26 20 00 Page 24

e. When used with pressure, float, or similar automatic-type or maintained-contact switch, provide a hand/off/automatic selector switch with the controller.

f. Connections to selector switch: wired such that only normal automatic regulatory control devices are bypassed when switch is in "hand" position.

g. Safety control devices, such as low and high pressure cutouts, high temperature cutouts, and motor overload protective devices: connected in motor control circuit in "hand" and "automatic" positions.

h. Control circuit connections to hand/off/automatic selector switch or to more than one automatic regulatory control device: made in accordance with indicated or manufacturer's approved wiring diagram.

i. Provide selector switch with the means for locking in any position.

j. Provide a disconnecting means, capable of being locked in the open position, for the motor that is located in sight from the motor location and the driven machinery location. As an alternative, provide a motor controller disconnect, capable of being locked in the open position, to serve as the disconnecting means for the motor if it is in sight from the motor location and the driven machinery location.

k. Overload protective devices: provide adequate protection to motor windings; be thermal inverse-time-limit type; and include manual reset-type pushbutton on outside of motor controller case.

l. Cover of combination motor controller and manual switch or circuit breaker: interlocked with operating handle of switch or circuit breaker so that cover cannot be opened unless handle of switch or circuit breaker is in "off" position.

2.21.1 Control Wiring

Provide control wiring in accordance with the following:

a. All control wire: stranded tinned copper switchboard wire with 600-volt flame-retardant insulation Type SIS meeting UL 44 , or Type MTW meeting UL 1063 , and passing the VW-1 flame tests included in those standards.

b. Hinge wire: Class K stranding.

c. Current transformer secondary leads: not smaller than No. 10 AWG.

d. Control wire minimum size: No. 14 AWG.

e. Power wiring for 480-volt circuits and below: the same type as control wiring with No. 12 AWG minimum size.

f. Provide wiring and terminal arrangement on the terminal blocks to permit the individual conductors of each external cable to be terminated on adjacent terminal points.

2.21.2 Control Circuit Terminal Blocks

Provide control circuit terminal blocks in accordance with the following:

SECTION 26 20 00 Page 25

a. NEMA ICS 4 .

b. Control circuit terminal blocks for control wiring: molded or fabricated type with barriers, rated not less than 600 volts.

c. Provide terminals with removable binding, fillister or washer head screw type, or of the stud type with contact and locking nuts.

d. Terminals: not less than No. 10 in size with sufficient length and space for connecting at least two indented terminals for 10 AWG conductors to each terminal.

e. Terminal arrangement: subject to the approval of the Contracting Officer with not less than four spare terminals or 10 percent, whichever is greater, provided on each block or group of blocks.

f. Modular, pull apart, terminal blocks are acceptable provided they are of the channel or rail-mounted type.

g. Submit data showing that any proposed alternate will accommodate the specified number of wires, are of adequate current-carrying capacity, and are constructed to assure positive contact between current-carrying parts.

2.21.2.1 Types of Terminal Blocks

a. Short-Circuiting Type: Short-circuiting type terminal blocks:

furnished for all current transformer secondary leads with provision for shorting together all leads from each current transformer without first opening any circuit. Terminal blocks: comply with the requirements of paragraph CONTROL CIRCUIT TERMINAL BLOCKS above.

b. Load Type: Load terminal blocks rated not less than 600 volts and of adequate capacity: provided for the conductors for NEMA Size 3 and smaller motor controllers and for other power circuits, except those for feeder tap units. Provide terminals of either the stud type with contact nuts and locking nuts or of the removable screw type, having length and space for at least two indented terminals of the size required on the conductors to be terminated. For conductors rated more than 50 amperes, provide screws with hexagonal heads. Conducting parts between connected terminals must have adequate contact surface and cross-section to operate without overheating.