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MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) • All gate posts (on both sides of the gate) shall be bonded to the nearest location of the building ground ring using 35 mm2 csa (#2 AWG) or coarser, bare, solid or stranded, tinned, copper conductors. The grounding conductors shall be buried to the same depth as the building ground ring, whenever practical. (ANSI T1.313-2003, figure 3(a)). • All gates shall be bonded to the gate supporting fence post with 16 mm 2 csa (#6 AWG) or coarser, stranded, copper conductors. This jumper wire should be constructed with a highly flexible conductor (ANSI T1.313-2003, figure 3(a)). See Figure 4-50 for an example. FIGURE 4-50 GATE BONDING EXAMPLE FLEXIBLE BONDING JUMPER If the site has non-electrified entry deterrent fence headers of barbed wire, razor wire, or other metallic wiring, the headers shall be grounded/bonded as follows: • The deterrent wiring, near each corner fence post, shall be bonded to the nearest location of the building ground ring using 35mm2 csa (#2 AWG) or coarser, bare, solid or stranded, tinned, copper conductor. This bond may be made using the same grounding conductor used for bonding the fence fabric. See Figure 4-49 for an example. • Each individual run of the deterrent wiring shall be bonded using a listed bimetallic transition connector. Each connection shall be liberally coated with a listed conductive antioxidant compound at the point of insertion into the connector. • The grounding conductor shall be routed so as not come into incidental contact with the deterrent wiring, fence post, fence fabric or support apparatus for the wire. Incidental contact can create an RF interference point. • The grounding conductor shall follow the proper routing methods described in “Bending And Routing Grounding (Earthing) Conductors” on page 4-29. NOTE: Consult with Motorola Engineering or other engineering firm for the grounding requirements/ recommendations of fence systems that extend well beyond the communications building and tower. 4-70 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS Grounding electrode system connections to commercial-grade fencing and gates shall be made using the exothermic welding process where possible. Coat all welded connections with zinc-enriched paint to prevent rusting. If exothermic welding is not possible, use the methods described below for residential fencing. If the site has residential quality fencing and/or preexisting fencing, it shall be grounded using heavy duty, tinned pipe clamps designed for fence grounding and stainless steel hardware (or equivalent). Residential-grade and/or preexisting fencing will not typically withstand exothermic welding. Fences around tower guy anchor points shall be bonded to the guy anchor ground rod using 35 mm 2 csa (#2 AWG) or coarser, bare, solid, tinned, copper conductors and bonded as outlined above. Guy anchor fence gates shall be bonded as described above. CAUTION Braided straps shall not be used because they corrode too quickly and can be a point for RF interference. 4.7.10.2 CABLE BRIDGE/ICE BRIDGE GROUNDING (EARTHING) Cable bridges and ice bridges are used to protect and support RF transmission lines between the tower structure and the equipment building/shelter. When present, cable bridges and ice bridges shall be bonded to the grounding (earthing) electrode system. Grounding of self-supported cable bridges/ice bridges shall be completed as follows (Figure 4-51): • Each support post shall bond to the grounding electrode system using a 35 mm 2 csa (#2 AWG) or coarser, bare, tinned, copper conductor. • Conductor bonding to the grounding electrode system shall be made using exothermic welding or listed irreversible high-compression fittings. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40 • Conductor bonding to the support posts shall be made using exothermic welding. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40 • To help insure effective bonding connections, the cable bridge/ice bridge should bond to each support post using a using a 16 mm 2 csa (#6 AWG) or coarser, jacketed (ANSI T1.334-2002, section 5.1), copper conductor (bonding jumper). Conductor bonding to the support post shall be made using exothermic welding. Conductor bonding to the cable bridge/ice bridge shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. • If more than one span of cable bridge/ice bridge is used between the tower and building, bonding jumpers should be installed between the sections to help ensure effective bonding. The bonding jumpers shall be a 16 mm 2 csa (#6 AWG) or coarser copper conductor. The bonding jumpers should use listed two-hole lugs and stainless steel hardware. 68P81089E50-B 9/1/05 4-71
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© 2005 MOTOROLA, INC. ALL RIGHTS R
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TABLE OF CONTENTS Chapter 1. Introd
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STANDARDS AND GUIDELINES FOR COMMUN
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CHAPTER 1 INTRODUCTION 1 This manua
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CHAPTER 2 SITE DESIGN AND DEVELOPME
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CHAPTER 3 COMMUNICATION SITE BUILDI
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CHAPTER 4 EXTERNAL GROUNDING (EARTH
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CHAPTER 6 POWER SOURCES 6 6.1 LOCKO
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CHAPTER 7 SURGE PROTECTIVE DEVICES
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CHAPTER 8 MINIMIZING SITE INTERFERE
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CHAPTER 9 EQUIPMENT INSTALLATION 9
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APPENDIX A ELECTROMAGNETIC ENERGY I
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APPENDIX B SOIL RESISTIVITY MEASURE
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APPENDIX C PROTECTING AGAINST ELECT
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APPENDIX D GROUNDING (EARTHING) ELE
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APPENDIX E GENERAL CONVERSIONS AND
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APPENDIX F R56 COMPLIANCE CHECKLIST
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I NDEX Index Index AC power cabling
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