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CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING) To MGB Unacceptable Method Equipment Rack Unacceptable series or "daisy chain" connected equipment grounding conductors. To MGB Ground bus conductors Lug suitable for connecting conductor to ground point. Unacceptable series or "daisy chain" connection method. Equipment ground connection point. Equipment Grounding Conductors. Typical each chassis and rack FIGURE 5-20 DAISY CHAIN GROUNDING NOT ALLOWED Acceptable Method Equipment Rack Individual equipment grounding conductor for each connection point to ground bus conductor. 5.4.2 BONDING TO EQUIPMENT AND ANCILLARY SUPPORT APPARATUS Conductors always routed toward ground bus and MGB. Irreversible crimp connection or split bolt. Typical each connection point. Properly sized hardware shall be used. Ground bus conductor or bar All applicable general and below bonding requirements shall apply when attaching equipment grounding (earthing) conductors to equipment and ancillary support apparatus: • Each electronic equipment chassis shall have a separate and independent equipment grounding conductor. • Paint, enamel, lacquer and other electrically non-conductive coatings shall be completely removed from threads and bonding surface areas to ensure good electrical continuity (NFPA 70-2005, Article 250.12). 5-34 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM NOTE: Use of a star washer does not alleviate the requirement to remove non-conductive coatings from attachment surfaces because the star washer does not provide enough contact surface area. • Connections to steel and galvanized steel pipes, conduit or other round member items shall be made using a UL 486A listed, bolted clamp with stainless steel securing hardware or other suitable listed means. In high humidity areas, the clamps shall be stainless steel or tin-plated UL 486A listed to prevent galvanic corrosion. • Connections to vibrating or moveable items shall be made by using an exothermic weld or a compression-type two-hole lug. • Connections to structural building steel shall be made by using an exothermic weld, listed irreversible high compression-type connection, or listed tin-plated flange-type bonding connector that is equipped with two securing bolts. Figure 5-21 shows examples of flange-type bonding connectors. FIGURE 5-21 ACCEPTABLE BUILDING STEEL BONDING CONNECTIONS • Connections to raised flooring support system shall be made using a tin-plated listed compression lug, listed pedestal clamp, or exothermic welding. Where practical the lug should be effectively bonded to the pedestal's upper support plate or to cross connecting stringer. Figure 5-22 shows some examples of acceptable pedestal bonding configurations. FIGURE 5-22 ACCEPTABLE RAISED FLOORING BONDING CONNECTIONS 68P81089E50-B 9/1/05 5-35
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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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Page 177 and 178: STANDARDS AND GUIDELINES FOR COMMUN
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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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