SECTION 27 05 26 - GROUNDING AND BONDING

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Common Use Self Service

Contract 10563

SECTION 27 05 26 - GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS PART 1 - GENERAL 1.1

SECTION INCLUDES A. Bonding telecommunications infrastructure devices and equipment to Telecommunications Grounding Backbone. B.

1.2

Related Sections: 1. Division 27 11 00 Communications Equipment

REFERENCES A. Comply with the References requirements of Section 27 00 00 B.

1.3

In addition to those codes, standards, etc. listed in Section 27 00 00, comply with the latest edition of the following applicable specifications and standards except as otherwise shown or specified: 1. NFPA 70, “National Electrical Code”, particularly the following Articles: a. Article 250: Grounding b. Article 770: Optical Fiber Cables and Raceways c. Article 800: Communications Systems d. Article 820: Community Antenna Television and Radio Distribution Systems 2. Underwriters Laboratories, Inc. (UL) UL 467: Grounding and Bonding Equipment. 3. Electronic Industries Association/Telecommunication Industry Association: a. ANSI-J-STD-607-A-2002: Commercial Building Grounding (Earthing) and Bonding Requirements for Telecommunications. b. ANSI/TIA/EIA-606-A-2002: Administration Standard for Commercial Telecommunications Infrastructure. 4. Institute of Electrical and Electronics Engineers, Inc./ (IEEE): a. IEEE 467: IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems. b. IEEE P1100: IEEE Recommended Practice for Powering and Grounding Sensitive Electronic Equipment in Industrial and Commercial Power Systems.

SYSTEM DESCRIPTION A. Related Section – Telecommunications Grounding Backbone System. 1. The Telecommunications Grounding Backbone system contains grounding bus bars, grounding conductors, bonding conductors, and connecting devices (including but not limited to pressure connectors, lugs or clamps). These components provide a low impedance path to ground for stray

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Grounding and Bonding for Communication Systems

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Contract 10563

voltages or spurious signals present on telecommunications media and equipment: a. TMGB: The TMGB is located in the SSR. b. The electrical contractor shall provide the TGB in the SSR’s with ground bars that will cover all walls with multiple type- two-hole (1/4” dia. X 5/8” on center). The corners shall be exothermically welded. c. The TWC shall have a single Telecommunications Ground Busbar in each room. B.

1.4

Base Bid Work 1. The work under this section includes furnishing materials, installation, and coordination of bonding for telecommunications equipment and apparatus to the Telecommunications Grounding Backbone. Furnish necessary materials, accessories, fasteners, etc., and the labor and associated services required to bond telecommunications equipment to ground busbar. 2. Bonding consists of TBCs within SSR’S from the TMGB and TGBs to the following components: a. Equipment cabinets b. Equipment racks c. Riser conduits. d. Cable tray and ladder racks

SUBMITTALS A. Comply with the following submittal requirements: 1. Product Data Submittal 2. Shop Drawings Submittal

1.5

QUALITY ASSURANCE A. Comply with Quality Assurance requirements of Section 27 00 00

PART 2 - PRODUCTS 2.1

BONDING CONDUCTOR A. Conductor: #6 AWG (up to 13 feet) stranded copper B.

Insulation: Low smoke, green in color

C.

Label : insulation grade, conductor gauge, and applicable UL jacket listings

D. Type THHN, or approved similar

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Grounding and Bonding for Communication Systems

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2.2

Contract 10563

CONNECTORS A. General: Connectors shall be UL Listed B.

2.3

Connector / Lug, Compression Type 1. Type- two-hole (1/4” dia. X 5/8” on center) standard barrell compression lug, for #6 AWG conductor. 2. Manufacturer: a. Thomas & Betts Part#54205

MISCELLANEOUS A. Wire Clamp 1. Material: nylon, UV stabilized 2. Color: black 3. Size: 0.25” holding diameter for AWG: or size as required based on conductor size 4. Manufacturer: a. Richco Inc. Part#N4B-BLK

PART 3 - EXECUTION 3.1

GENERAL A. Comply with the Execution requirements of Section 27 00 00

3.2

EXAMINATION AND PREPARATION A. Prior to the start of this Section’s Work, examine Telecommunications Grounding Backbone system (installed by others) for completeness.

3.3

INSTALLATION A. Provide TBC and appropriate grounding hardware between the nearest TMGB/TGB and the equipment racks/cabinets. B.

Telecommunication Bonding Conductors / TBCs 1. Install TBCs in a manner that will protect them from physical and mechanical damage. 2. Routing: a. Route TBCs in the shortest possible path, using right angles for turns and routed parallel to building lines. b. Utilize a minimum 1-foot bend radius 3. AT TMGB/TGBs: a. Thoroughly clean non electrotin-plated busbar prior to fastening the

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Grounding and Bonding for Communication Systems

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b. c. d. C.

Contract 10563

conductors, bolts, or connectors to the busbar. Within TWC’s main ground can be attached with two hole compression lugs. Attach lugs to busbar with appropriate size cadmium bronze bolt, flat washer and Bellville washer. Torque connections

Equipment Rack/Cabinet 1. Bond equipment rack, frames, frame bays, cabinets, server racks, and other similar support systems located within the same room or space as the TMGB/TGB to the busbar. 2. Rack bays may be bonded in series with the rack closet to the TMGB/TGB bonded to the busbar. Note: Use only one lug per rack. Cabinet bays in the MDF may not be bonded in rack. Cabinet bays in the MDF may not be bonded in series.

D. Termination Field 1. Bond termination field frames to the busbar. 2. Termination field frames may be bonded in series with the frame closest to the TMGB/TGB bonded to the busbar. Note: Use one grounding lug at each frame. E.

3.4

Floor 1. Bond Antistatic floor to the busbar.

RECORDS A. Telecommunications bonding system records shall conform to TIA/EIA-606-A. Each shall have as a minimum, the information as outline in TIA/EIA-606-A.

END OF SECTION 27 05 26

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