Attachment 1: Specifications - Metropolitan Washington Airports ...

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DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 B. Provide communications systems backboards with a No. 6 copper grounding conductor to the nearest referenced ground plate. C. Bond together system neutrals, service equipment enclosures, all non-current carrying metal parts of electrical equipment, metal raceway systems, grounding conductor in raceways and cables, and receptacle ground connectors. Exception: IG receptacles shall have the Equipment Grounding Conductor carried back to the source IG bar and shall not be bonded to the raceway or box at the receptacle yoke. 1.5 SUBSTITUTIONS A. Comply with the requirements of Division 01 Section “Product Requirements.” 1.6 QUALITY ASSURANCE A. Standards of workmanship shall meet or exceed accepted telecommunications systems industry installation practices. 1.7 SUBMITTALS A. General: Comply with the requirements of Division 01 Section “Submittals.” B. Additional submittal procedures are identified in Division 27 Section “Basic Telecommunication Requirements” and in the individual technical specification. C. Bonding equipment, including exothermic or removable screw type. D. Submit all field test reports. 1.8 PROJECT RECORD DOCUMENTS A. Comply with the requirements of Division 01 Section “Project Record Documents.” PART 2 - PRODUCTS 2.1 MATERIALS A. Grounding Connection Accessories. 1. Electrical insulating tape, heat-shrinkable insulating tubing, welding materials, bonding straps, as recommended by accessories manufacturers for type of service required. B. Exothermic welded connections are required where grounding conductors by bonding to building steel. GROUNDING AND BONDING FOR COMMUNICATION SYSTEMS 27 05 26 - 2
DCA TERMINAL A IMPROVEMENTS (NEAR TERM) 10 AUGUST 2012 TASK ORDER 03: LOBBY IMPROVEMENTS – PKG 4 - CURBSIDE CHECK-IN RONALD REAGAN WASHINGTON NATIONAL AIRPORT PROJECT DT1203 C. All ground wires shall be copper, sized according to the NEC or as shown on the Drawings, whichever is larger. D. Signal Reference Grid mat conductors shall be at least .04” thick by 2.75” wide and spaced not more than 2 ft x 2 ft. Conductors shall be welded or soldered at every intersection. E. Ground rods shall be 10-feet x 5/8-inches diameter copper-clad steel. PART 3 - EXECUTION 3.1 INSTALLATION A. Provide a separate, insulated, equipment grounding conductor in all branch circuit conduits. B. Use minimum No. 6 AWG copper conductor for communications service grounding conductor. Leave 10 feet slack conductor at terminal board or cabinet. C. Provide isolated and insulated ground conductors for all microprocessor and data processing equipment. The isolated Equipment Ground Conductor and neutral conductor for a given branch circuit shall not be shared across branch circuits. D. Tighten grounding and bonding connectors and terminals, including screws and bolts, in accordance with manufacturer’s published torque tightening values for connectors and bolts. Where manufacturer’s torque requirements are not indicated, connections are to be tightened to comply with tightening torque values specified in UL 486A to assure permanent and effective grounding. E. Provide code-sized ground cable bonding jumpers, installed with ground clamps, across all conduit expansion couplings and fittings, including flexible steel conduit used as expansion fittings. F. Provide a corrosion-resistant finish to field connections where factory applied protective coatings have been destroyed. G. All continuous runs of cable tray and all isolated sections of cable tray shall be bonded and grounded. H. Provide an equipment grounding conductor in all nonmetallic conduits. I. All receptacles and switches shall be provided with ground jumper from outlet box to ground terminal of the device. Exception isolated ground receptacles. J. Provide parallel equipment bonding jumper for parallel conduit feeders. K. Provide bonding jumpers around all concentric or eccentric knockouts. GROUNDING AND BONDING FOR COMMUNICATION SYSTEMS 27 05 26 - 3
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TECHNICAL SPECIFICATIONS VOLUME I O
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Attachment 1: Specifications - Metropolitan Washington Airports ...

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