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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) Split Bolt or irreversible crimp Equipment grounding conductor or ground bus conductor • Ground bus conductors shall be routed using the shortest possible routes. They may extend into an adjoining subsystem equipment area and may serve as the grounding conductor for a SSGB or a RGB. These ground bus conductors may have ground bus extension conductors to provide a ground bus within cross section segments of a cable tray system. These ground bus extension conductors shall be of the same specification as the ground bus conductor and shall be routed with all connections to the ground bus conductor pointed in the direction of the MGB or SSGB. To MGB, SSGB or ground system Small hole From equipment or object to be grounded Bolt with nut and lock washer Lug Ferrous material Inside of cabinet or structure Conductors of different groups must be adequately separated on either side of the hole or opening. Equipment grounding conductor or ground bus conductor From equipment or object to be grounded Large hole or opening Ferrous material Other Conductors FIGURE 5-14 CONDUCTOR ROUTING THROUGH HOLES OR OPENINGS IN METALLIC SURFACES • Bending radius: Ground bus conductors of all sizes shall maintain a minimum bending radius of 203 mm (8 in.). The angle of any bend shall not be less than 90 degrees (NFPA 780-2004, Section 4-9.5). See Figure 5-13 on page 5-19. • Separation: • All ground conductors shall be separated a minimum of 51 mm (2 in.) from conductors of other cable groups as defined in “Cable Trays” on page 3-18, and “Cable Separation and Grouping within Racks and Cabinets” on page 9-12. Grounding conductors may come in contact with other cable groups if they cross at a 90 degree angle and the crossing angle can be maintained. An exception may be when conductors are grouped together to enter or exit a cabinet or enclosure. Grouping only at this point is acceptable, provided the conductors are suitably separated on either side of the opening. • To minimize potential inductive effects when routing a grounding conductor through ferrous material, the conductor shall be separated from the ferrous material by a distance of at least 51 mm (2 in.) where achievable, or the grounding conductor shall be effectively bonded to the ferrous material. See Figure 5-14. 5-22 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS Ground Bus Conductor To MGB FIGURE 5-15 GROUND BUS CONDUCTOR ROUTING To MGB Irreversible crimp connector or split bolt Equipment Rack Ground Bus Conductor Irreversible Crimp Connector or Split Bolt Cable Tray Bonding Jumpers. Typical at each section connection point. Cable Tray Equipment Grounding Conductor Route conductors toward ground bus and MGB. Equipment Rack Equipment Rack Ground Bus Extension Conductors FIGURE 5-16 GROUND BUS CONDUCTOR ROUTING - TOP VIEW OF CABLE TRAYS 68P81089E50-B 9/1/05 5-23
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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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