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BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING) • The SSGB bonding conductor shall be connected to the communication bonding backbone conductor or to the grounding equalizer conductor with an exothermic welding or listed irreversible compression-type connection (ANSI-J-STD-607-A-2002) • When a grounding equalizer conductor is installed as described within this chapter, it shall be bonded back to the SSGBs and not to the communication bonding backbone conductors. • The grounding equalizer conductor shall be connected to the SSGBs with exothermic welding, listed compression-type two-hole lugs, or listed irreversible compression type connections. • Only the far end of a communication bonding backbone conductor may be connected directly to the SSGB. If the communication bonding conductor is connected directly to the SSGB, it shall be connected with exothermic welding or irreversible compression type connection. See Figure 5-4 on page 5-7 for an example of this type of grounding system configuration. 5.5 BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM All equipment and ancillary support apparatus shall be bonded to the MGB, SSGB, RGB, ground (earth) bus conductor or internal perimeter ground bus (IPGB) conductor with an equipment grounding conductor as described within this chapter. TABLE 5-6 BONDING TO THE INTERNAL GROUNDING SYSTEM FROM ITEM TOWARD EARTH From To Item MGB SSGB RGB Ground Bus Conductor IPGB Minimum Conductor Size Unless Otherwise Specified 35 mm 2 csa (#2 AWG) SSGB ✔ ✔ ✔ ✔ RGB ✔ ✔ ✔ ✔ ✔ Equipment ground bus extension ✔ ✔ ✔ ✔ ✔ 16 mm 2 csa (#6 AWG) Equipment cabinet ✔ ✔ ✔ ✔ ✔ Equipment rack ✔ ✔ ✔ ✔ Equipment grounding conductor Individual system component chassis Control or Dispatch Centers electronic equipment and metallic parts of furniture ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ 5-40 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM TABLE 5-6 BONDING TO THE INTERNAL GROUNDING SYSTEM FROM ITEM TOWARD EARTH (CONTINUED) Cable tray ✔ ✔ ✔ Transmission line surge suppressors Primary surge suppressor From To Item MGB SSGB RGB Secondary surge suppressor ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ DC power plant ✔ ✔ ✔ Separately derived AC electrical systems ✔ ✔ ✔ ✔ IPGB ✔ ✔ ✔ Ancillary support items and metallic structural items Ground Bus Conductor IPGB ✔ ✔ ✔ ✔ 5.5.1 EQUIPMENT AND ANCILLARY SUPPORT APPARATUS BONDING All equipment and ancillary support apparatus including, but not limited, to that listed below shall be effectively bonded back to the internal grounding system with a minimum 16 mm 2 csa (#6 AWG) equipment grounding conductor unless otherwise specified herein. All grounding and bonding conductors shall be established by using the following requirements and connection methods described within this chapter: • Separately Derived AC Systems • DC Power Plant • Equipment • Cabinets and Racks • Cable Trays • Ancillary Support Apparatus • Metallic Building Structure and Piping Systems • Surge Protection Devices Minimum Conductor Size Unless Otherwise Specified 35 mm 2 csa (#2 AWG) 16 mm 2 csa (#6 AWG) 68P81089E50-B 9/1/05 5-41
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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 183 and 184: 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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