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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) ELECTRICAL SERVICE ENTRANCE SSGB SSGB DISPA PATCH ROOM Branch Circuit Outlet Box External Surge Protective Device Equipment EQUIPMENT ROOM FIGURE 5-3 SINGLE-STORY BUILDING WITH COMMON ENTRY LOCATION The preferred configuration for a multi-story building is to have all utilities enter the structure through a common wall, room or adjacent rooms as close as practical to each other. The single point grounding location for this type of structure must be located at the utilities entrance location preferably close to the building's electrical service (power) ground. See Figure 5-4 for an overview of the preferred internal grounding system design. 5-6 68P81089E50-B 9/1/05 SSGB TELECOMMUNICATIONS A ENTRANCE FFACILITY MGB TC Equipment Grounding Conductor for MGB External Secondary Protector Unit ACEG provided in supply cords Bond to furniture Video Processor/ Controller Headset Interface Bond to raised floor = ELECTRICAL PANELBOARD
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS Grounding Conductor Metal Frame of Building ELECTRICAL ENTRANCE FACILITY F Electrode System SSGB SSGB Groundding Conductor for MGB POLICE DISPA PATCH ROOM Equipment OTHER TELECOMMUNICATIONS A ROOM Equipment TELECOMMUNICATIONS A ENTRANCE FFACILITY Equipment Master Ground Bus Bar (MGB) FIGURE 5-4 MULTI-STORY BUILDING WITH COMMON ENTRY LOCATION An effective low-impedance internal grounding system can be achieved through the use of the components listed below, all of which must be effectively bonded together so that there is minimal difference in potential among them. Figure 5-5 shows the major components of a typical internal grounding system. • Master Ground Bus Bar (MGB) • Sub System Ground Bus Bar (SSGB) • Rack Ground Bus Bar (RGB) • Grounding conductors Grounding Equalizer Pathways Communication Bonding Backbone FIRE DISPA PATCH ROOM Equipment NETWORK EQUIPMENT ROOM Equipment = ELECTRICAL PANELBOARD EQUIPMENT ROOM Equipment Sub System Bus Bar (SSGB) 68P81089E50-B 9/1/05 5-7 SSGB SSGB
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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 149 and 150: STANDARDS AND GUIDELINES FOR COMMUN
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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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