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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) INTERIOR OF EQUIPMENT BUILDING/SHELTER ANCILLARY SUPPORT EQUIPMENT RGB BATTERY RACK ELECTRICAL PANEL NEUTRAL GROUND BOND SSGB INTERNAL PERIMETER GROUNDING CONDUCTORS (WALL-MOUNTED) MGB GROUND BUS CONDUCTORS TO EXTERNAL GROUNDING ELECTRODE SYSTEM COMMUNICATIONS SYSTEM EQUIPMENT AREA 1 FIGURE 5-5 TYPICAL SINGLE-POINT INTERNAL GROUNDING SYSTEM EQUIPMENT GROUNDING CONDUCTOR 5-8 68P81089E50-B 9/1/05 RGB COMMUNICATIONS SYSTEM EQUIPMENT AREA 2
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS 5.3.1 MASTER GROUND (EARTH) BUS BAR The purpose of the master ground bus bar (MGB) is to provided a convenient internal grounding (earthing) termination point for the communication system and to serve as a dedicated extension of the site's common grounding electrode system. The MGB functions as the primary internal earth reference point for all equipment ground bus conductors, grounding conductors and communications equipment within the facility. Typically, there should only be a single MGB per building (ANSI-J-STD-607-A- 2002 and ANSI T1.334-2002). NOTE: Large buildings or campuses with multiple power feeds may require special design considerations that are beyond the scope of this document. Consultation with Motorola Engineering or with an engineering firm specializing in grounding system design is recommended in these instances. A single MGB shall be installed for the communications system within a shelter, building, room or equipment area. The MGB should be located in close proximity to the electrical service entrance and installed with insulated mounting hardware. It may also be installed in an assembly of communications equipment cabinets as deemed necessary to ensure an effective bonding point for all equipment earthing conductors. A typical MGB with insulated mounting hardware is shown in Figure 5-6. FIGURE 5-6 TYPICAL MASTER GROUND BUS BAR 5.3.1.1 MGB SPECIFICATIONS The MGB shall be a copper bus bar with predrilled holes that provide for the use of standard-sized lugs. It is recommended that the bus bar be electrotin plated for reduced contact resistance. The MGB shall be sized in accordance with the immediate application and consideration should be given to future growth of the site. The MGB shall be listed by a nationally recognized testing laboratory (ANSI-J-STD-607-A-2002). See Table 5-1 on page 5-10 for additional specifications and requirements. 68P81089E50-B 9/1/05 5-9
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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 151 and 152: 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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