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MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) BUILDING GROUND RING ICE BRIDGE SEGMENTS BONDING JUMPERS FIGURE 4-51 PROPER GROUNDING OF SELF-SUPPORTING ICE BRIDGE LEGS BONDED TOGETHER BELOW GRADE, THEN BONDED TO GROUND RINGS USING 35 mm 2 csa (#2 AWG) OR COARSER WIRE TOWER GROUND RING Grounding of tower and/or building supported cable bridges/ice bridges shall be completed as follows: • At the building: The cable bridge/ice bridge shall bond to the grounding electrode system. Bonding to the grounding electrode system may be accomplished using a 16 mm 2 csa (#6 AWG) or coarser copper conductor bonded to the External Ground Bus bar (EGB). Conductor bonding to the cable bridge/ice bridge and EGB shall be made using exothermic welding, or two-hole lugs and stainless steel hardware. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40. Bonding of the cable bridge/ice bridge to the grounding electrode system may also be accomplished using a 35 mm2 csa (#2 AWG) or coarser, bare, copper conductor bonded directly to the grounding electrode system. Conductor bonding to the grounding electrode system shall be made using exothermic welding or listed irreversible high-compression fittings. Conductor bonding to the cable bridge/ice bridge shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40. • At the tower: Cable bridges/ice bridges may be sufficiently grounded when an integral part of the tower construction and bonded directly to the tower through multiple metallic mechanical connections. The metallic connections shall be of the same metals and shall provide direct metalto-metal contact without any non-conductive coatings, such as paint. When the cable bridge/ice bridge is not effectively bonded to the tower, additional bonding shall be required in order to effectively ground the cable bridge/ice bridge. The additional bonding shall be accomplished using one of the following techniques: • Installing a 16 mm 2 csa (#6 AWG) or coarser copper conductor (bonding jumper) between the cable bridge/ice bridge and the tower. Conductor bonding to the cable bridge/ice bridge shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. Conductor bonding to the tower shall be made using exothermic welding, or other suitable hardware. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40. 4-72 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS • Installing a 16 mm 2 csa (#6 AWG) or coarser copper conductor (bonding jumper) between the cable bridge/ice bridge and the tower ground bus bar (TGB). Conductor bonding to the cable bridge/ice bridge and TGB shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. See “Bonding to the External Grounding (Earthing) Electrode System” on page 4-40. • Installing a 35 mm 2 csa (#2 AWG) or coarser, bare, copper conductor bonded directly to the grounding electrode system. Conductor bonding to the grounding electrode system shall be made using exothermic welding or listed irreversible high-compression fittings. Conductor bonding to the cable bridge/ice bridge shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. The grounding conductor should be installed in a flexible non-metallic conduit to help prevent incidental contact with other metals, allow for protection of the conductor, and to help support the conductor. In order to reduce the amount of lightning energy diverted towards the equipment building/shelter, and to provide seismic isolation between the building and tower, it is recommended to secure the cable bridge/ice bridge to the tower through a non-conductive slip-joint type device. When a slip-joint type device is used, grounding of the cable bridge/ice bridge at the building shall be completed as described above; grounding at the tower end of the cable bridge/ice bridge shall be completed as follows: • Installing a 35 mm 2 csa (#2 AWG) or coarser, bare, copper conductor bonded directly to the grounding electrode system. Conductor bonding to the grounding electrode system shall be made using exothermic welding or listed irreversible high-compression fittings. Conductor bonding to the cable bridge/ice bridge shall be made using exothermic welding, or listed two-hole lugs and stainless steel hardware. The grounding conductor should be installed in a flexible non-metallic conduit to help prevent incidental contact with other metals, allow for protection of the conductor, and to help support the conductor. See Figure 4-52. TOWER GROUND RING INSULATING A MA ATERIAL SUCHAS FIBERGLASS ISOLATING A BRACKETT WITH SLOT T ADJUSTMENT ALLOWS FOR SIESMIC MOVEMENT TRANSMISSION LINE ENTRY Y PORTS EGB FLEXIBLE NONMETALLIC CONDUIT BONDING JUMPER BUILDING FIGURE 4-52 PROPER GROUNDING OF NON-SELF-SUPPORTING ICE BRIDGE 68P81089E50-B 9/1/05 4-73
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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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