VA 27 05 26-2006 GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS.pdf
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1、10-06M 27 05 26 - 1 SECTION 27 05 26 GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS SPEC WRITER NOTE: Delete / _ / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. Insert additional provisions as required for this proj
2、ect. PART 1 - GENERAL 1.1 DESCRIPTION A. This section specifies general grounding and bonding requirements of telecommunication installations for equipment operations. B. “Grounding electrode system” refers to all electrodes required by NEC, as well as including made, supplementary, telecommunicatio
3、ns system grounding electrodes. C. The terms “connect” and “bond” are used interchangeably in this specification and have the same meaning. 1.2 RELATED WORK A. Section 27 05 11, REQUIREMENTS FOR COMMUNICATIONS INSTALLATIONS: General electrical requirements and items that are common to more than one
4、section of Division 27. B. Section 27 10 00, STRUCTURED CABLING: Low Voltage power and lighting wiring. C. Section 26 41 00, FACILITY LIGHTNING PROTECTION: Requirements for a lightning protection system. 1.3 SUBMITTALS A. Submit in accordance with Section 27 05 11, REQUIREMENTS FOR COMMUNICATIONS IN
5、STALLATIONS. B. Shop Drawings: 1. Sufficient information, clearly presented, shall be included to determine compliance with drawings and specifications. 2. Include the location of system grounding electrode connections and the routing of aboveground and underground grounding electrode conductors. C.
6、 Test Reports: Provide certified test reports of ground resistance. D. Certifications: Two weeks prior to final inspection, submit four copies of the following to the Resident Engineer: 1. Certification that the materials and installation is in accordance with the drawings and specifications. Provid
7、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-06M 27 05 26 - 2 2. Certification, by the Contractor, that the complete installation has been properly installed and tested. 1.4 APPLICABLE PUBLICATIONS Publications listed below (including amendments, add
8、enda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. A. American Society for Testing and Materials (ASTM): B1-2001 Standard Specification for Hard-Drawn Copper Wire B8-2004 Standar
9、d Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft B. Institute of Electrical and Electronics Engineers, Inc. (IEEE): 81-1983 IEEE Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System C. National Fire Protecti
10、on Association (NFPA): 70-2005 National Electrical Code (NEC) D. Telecommunications Industry Association, (TIA) J-STO-607-A-2002. Commercial Building Grounding (Earthing) and Bonding Requirements for Telecommunications E. Underwriters Laboratories, Inc. (UL): 44-2005 . Thermoset-Insulated Wires and
11、Cables 83-2003 . Thermoplastic-Insulated Wires and Cables 467-2004 Grounding and Bonding Equipment 486A-486B-2003 Wire Connectors PART 2 - PRODUCTS 2.1 GROUNDING AND BONDING CONDUCTORS A. Equipment grounding conductors shall be UL 83 insulated stranded copper, except that sizes 6 mm (10 AWG) and sma
12、ller shall be solid copper. Insulation color shall be continuous green for all equipment grounding conductors, except that wire sizes 25 mm (4 AWG) and larger shall be permitted to be identified per NEC. B. Bonding conductors shall be ASTM B8 bare stranded copper, except that sizes 6 mm (10 AWG) and
13、 smaller shall be ASTM B1 solid bare copper wire. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-06M 27 05 26 - 3 C. Isolated Power System: Type XHHW-2 insulation with a dielectric constant of 3.5 or less. D. Telecom System Grounding Riser Conduc
14、tor: Telecommunications Grounding Riser shall be in accordance with J STO-607A. Use a minimum 50mm (1/0 AWG) insulated stranded copper grounding conductor unless indicated otherwise. 2.2 GROUND RODS A. Copper clad steel, 19 mm (3/4-inch) diameter by 3000 mm (10 feet) long, conforming to UL 467. B. Q
15、uantity of rods shall be as required to obtain the specified ground resistance. 2.3 SPLICES AND TERMINATION COMPONENTS Components shall meet or exceed UL 467 and be clearly marked with the manufacturer, catalog number, and permitted conductor size(s). 2.4 TELECOMMUNICATION SYSTEM GROUND BUSBARS A. P
16、rovide solid copper busbar, pre-drilled from two-hole lug connections with a minimum thickness of 6 mm (1/4 inch) for wall and backboard mounting using standard insulators sized as follows: 1. Room Signal Grounding: 300 mm x 100 mm (12 inches x 4 inch). 2. Master Signal Ground: 600 mm x 100 mm (24 i
17、nches x 4 inch). 2.5 GROUND CONNECTIONS A. Below Grade: Exothermic-welded type connectors. B. Above Grade: 1. Bonding Jumpers: compression type connectors, using zinc-plated fasteners and external tooth lockwashers. 2. Ground Busbars: Two-hole compression type lugs using tin-plated copper or copper
18、alloy bolts and nuts. 3. Rack and Cabinet Ground Bars: one-hole compression-type lugs using zinc-plated or copper alloy fasteners. A. Cable Shields: Make ground connections to multipair communications cables with metallic shields using shield bonding connectors with screw stud connection. 2.6 EQUIPM
19、ENT RACK AND CABINET GROUND BARS Provide solid copper ground bars designed for mounting on the framework of open or cabinet-enclosed equipment racks with minimum dimensions of 4 mm thick by 19 mm wide (3/8 inch x inch). Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
20、ense from IHS-,-,-10-06M 27 05 26 - 4 2.7 GROUND TERMINAL BLOCKS At any equipment mounting location (e.g. backboards and hinged cover enclosures) where rack-type ground bars cannot be mounted, provide screw lug-type terminal blocks. 2.8 SPLICE CASE GROUND ACCESSORIES Splice case grounding and bondin
21、g accessories shall be supplied by the splice case manufacturer when available. Otherwise, use 16 mm (6 AWG) insulated ground wire with shield bonding connectors. PART 3 - EXECUTION 3.1 GENERAL A. Ground in accordance with the NEC, as shown on drawings, and as hereinafter specified. B. System Ground
22、ing: 1. Secondary service neutrals: Ground at the supply side of the secondary disconnecting means and at the related transformers. 2. Separately derived systems (transformers downstream from the service entrance): Ground the secondary neutral. 3. Isolation transformers and isolated power systems sh
23、all not be system grounded. C. Equipment Grounding: Metallic structures (including ductwork and building steel), enclosures, raceways, junction boxes, outlet boxes, cabinets, machine frames, and other conductive items in close proximity with electrical circuits shall be bonded and grounded. SPEC WRI
24、TER NOTE: If appropriate for project, include details involving grounding for patient equipment and areas on plans. Standard Details may be obtained at http:/www.va/gov/facmgt/standard/details-elec.asp. 3.2 INACCESSIBLE GROUNDING CONNECTIONS Make grounding connections, which are buried or otherwise
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