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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) 5.3 GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS UPS Panelboard Utility Panelboard Generator Automatic Transfer Switch Telecommunications cable entry port Transmission Line entry port To external ground system* Electrical Service ground * Electrical Service Main Disconnect This chapter provides guidelines and requirements for establishing an internal grounding (earthing) system within a standalone equipment shelter, single-story building and multi-story building. The guidelines described in this chapter shall also be utilized for establishing an internal grounding system within an outdoor equipment vault, enclosure, or cabinet. All new site design, development and construction should have a prime objective of establishing a single point internal ground system for all interconnected communication systems and networking systems located within the facility. To help achieve this objective, all utilities and telecommunication cables should be coordinated to enter the facility through a common wall, room, or area within the facility. The preferred configuration for a stand-alone equipment shelter is to have all utilities enter the structure through a common wall as close as practical to the transmission line entry port location. The main electrical service disconnect must be located on the shelter wall at the service entrance. For additional details on main service disconnect, see “Circuit Protection” on page 6-8. If it is unavoidable that utilities enter an existing or new stand-alone equipment shelter at different locations, additional grounding is required to adequately dissipate high amounts of electrical energy from a lightning strike or possible power fault. The single point grounding location for this type of structure must be located next to the electrical service entrance location and as close as practical to the transmission line entry port location. See Figure 5-1 for a high level overview of the preferred internal grounding system design. UPS Equipment Grounding Conductor. Typical at each support apparatus. Equipment Grounding Conductor. Typical each cable tray joint and to bond the cable to the MGB. MGB Exhaust Fan Cable Runway Bonding Jumpers. Typical at each section connection point. Door Entry Equipment Grounding Conductor. Typical at each Cabinet, Rack and Equipment Chassis. Green-jacketed Ground Bus conductor Typical equipment rack or cabinet Cable Tray Interior Perimeter Ground Bus Green-jacketed Ground Bus conductor *NOTE:No exterior ground system conductors shown. Electrical service grounding electrode conductor must be bonded to external site ground system. FIGURE 5-1 STAND-ALONE SHELTER WITH COMMON ENTRY LOCATION Air Intake louver Interior Perimeter Ground Bus Equipment Grounding Conductor. Typical at each support apparatus. Air Conditioner grille. Typical each unit. Separation in Perimeter Ground Bus 5-4 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS Utility Panelboard Generator Automatic Transfer Switch Telecommunications cable entry port Transmission Line entry port MGB Grounding Electrode Conductor UPS Panelboard UPS Electrical Service Main Disconnect Electrical Service ground Required #2 AWG Grounding Conductor for bonding Primary SPD to the MGB. MGB IPGB System Primary SPD for Telecommunication cable entry port Shelter External Ground Ring Conductor #2 AWG grounding electrode conductor Required because telecom cable entry port is located more than 20 linear ft from MGB grounding electrode conductor FIGURE 5-2 STAND-ALONE SHELTER WITH DIFFERENT ENTRY LOCATIONS SSGB for RF SPDs Alternate Transmission Line entry port Note: This configuration is to be avoided whenever possible. The preferred configuration for a single-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 5-3 for an overview of the preferred internal grounding system design. 68P81089E50-B 9/1/05 5-5
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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 147 and 148: 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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