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CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING) P A N I Surge Producers RF SPD AC Equip. Tel. SPD Cable Shields ESD Surge Absorbers Building Steel AC NG Bond Water Line Metallic Piping Concrete Encased Electrode Ground Rings Non IGZ +48VDC GND. -24VDC GND. Cable Tray Sys. Equip. Frame Battery Racks Anciliary Equip. FIGURE 5-24 PANI BUS BAR CONFIGURATION Isolated Ground Zones (IGZ) Logic Ground. IG Zones 5.4.4 BONDING TO GROUND (EARTH) BUS CONDUCTORS All applicable general bonding requirements shall apply when attaching ground (earth) bus extension conductors and equipment grounding conductors to a ground bus conductor. The following requirements also apply: • All ground bus conductors should be installed without splices. Where splices are necessary, the number of splices should be kept to a minimum and they shall be accessible and only located in telecommunication spaces. The joined segments shall be connected using exothermic welding or listed irreversible compression-type connectors. All bonding joints shall be adequately supported and protected from damage (ANSI-J-STD-607-A-2002). • Ground bus extension conductors shall always be routed toward the MGB or SSGB at the point of connection to the ground bus conductor. Ground bus extension conductors shall be connected to the ground bus conductor using exothermic welding or listed irreversible compression-type connectors. Connection points shall be taped with a suitable green tape or otherwise isolated from contact with the cable tray or other metallic surfaces. • Equipment grounding conductors shall always be routed toward the MGB or SSGB at the point of connection to the ground bus conductor. Equipment grounding conductors shall be connected to the ground bus conductor using exothermic welding, listed compression-type connections, or listed split bolt connections. Connection points shall be taped with a suitable green tape or otherwise isolated from contact with the cable tray or other metallic surfaces. • Equipment grounding conductors shall be connected so that the removal of a connection will not break the ground path to any other piece of equipment or ancillary support device that may have electrical power applied. • Multiple connections shall not be made to one attachment point on the ground bus conductor unless this connection is made using exothermic welding, listed irreversible compression-type connector or listed split bolt. In all cases the connection means shall be listed for the size and number of conductors to be connected. 5-38 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM UNACCEPTABLE METHOD unless the split bolt is listed for the size and number of conductors to be connected. To MGB Split Bolt Split Bolt Equipment Grounding Conductors Ground Bus Conductor NOTE: Route all conductors toward the MGB. FIGURE 5-25 BONDING TO GROUND BUS CONDUCTOR ACCEPTABLE METHODS Irreversible crimp connection (must be listed for multiple connections) Equipment Grounding Conductors 5.4.5 BONDING TO COMMUNICATION BONDING BACKBONE CONDUCTORS AND GROUNDING (EARTHING) EQUALIZER CONDUCTORS All applicable general bonding requirements and the requirements below shall apply when attaching SSGB grounding (earthing) conductors to a communication bonding backbone conductor or a grounding equalizer conductor. NOTE: Only SSGBs should be bonded back to a communication bonding backbone conductor or a grounding equalizer conductor. All equipment and ancillary apparatus grounding conductors should be bonded back to the SSGB as described within this chapter. • All communication bonding backbone conductors should be installed without splices. Where splices are necessary, the number of splices should be kept to a minimum and they shall be accessible and only located in telecommunication spaces. The joined segments shall be connected using exothermic welding or listed irreversible compression-type connectors. All bonding joints shall be adequately supported and protected from damage (ANSI-J-STD-607-A-2002). • The bonding conductor between the SSGB and the communication bonding backbone or grounding equalizer conductor shall be of the same specifications as the communication bonding backbone conductor. • The bonding conductor between the SSGB and the communication bonding backbone or grounding equalizer conductor shall be continuous and routed in the shortest possible straight line path back towards the MGB. If a bend is required in the SSGB bonding conductor, minimum bending radius and angle shall be adhered to. 68P81089E50-B 9/1/05 5-39
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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 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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