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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) #2AWG STRANDED, OR SOLID CONDUCTOR. INTERNAL PERIMETER GROUND BUS. CONNECTED TO MGB AT ONE END. TYPICAL EQUIPMENT RACK CHASSIS AND EQUIPMENT GROUND CONDUCTORS TO TO TOWER GROUND ELECTRODE SYSTEM EQUIPMENT OUND DUCTOR TO B TELCO GROUND MGB ENTRANCE PANEL KIT WITH THROUGH WALL MOUNTING OF EXTERIOR GROUND BAR AND ENTRANCE PANEL GROUND STRAP EXOTHERMICALLY WELDED TO THE SHELTER GROUND RING. TO TOWER GROUND ELECTRODE SYSTEM CLAMP STANDOFF BOND CABLE TRAY TO MGB COAX ENTRY PORT 5/8"X10' COPPER CLAD GROUND ROD. UTILITY SERVICE GROUND EXOTHERMICALLY WELDED FIGURE 5-8 STAND-ALONE SHELTER WITH COMMON ENTRY LOCATION BOND EXHAUST FAN AND AIR VENTS TO INTERNAL PERIMETER GROUND BUS CONDUCTOR WITH NO. 6-7G CONDUCTOR BOND DOOR FRAME TO INTERNAL PERIMETER GROUND BUS CONDUCTOR WITH NO. 6-7G CONDUCTOR BOND AC ELECTRIC SERVICE TO MGB PER NFPA The MGB must be insulated from its support structure just below the point where the transmission lines enter the facility, shelter or enclosure. In facilities or shelters where the transmission lines enter through a wall at floor level or through conduits within the floor or ceiling, the MGB should be located on the wall or floor immediately adjacent to the transmission lines entry point. In all cases, the MGB must located in a position that provides the shortest and straightest routing of the grounding conductors to the grounding electrode system. In facilities where the transmission lines, the electrical service and the telecommunication cables enter at different locations, the MGB must be located as described within this chapter. In all cases the transmission lines, the telecommunication cables and the electrical service shall be effectively bonded back to the MGB, and the MGB shall be effectively bonded back to the grounding electrode system as described within this chapter. 5.3.1.3 BONDING: MGB-TO-GROUNDING (EARTHING) ELECTRODE SYSTEM The installation specifications of the MGB and the acceptable methods for bonding the MGB to the site's grounding (earthing) electrode system are listed below. The following requirements are from ANSI-J-STD-607-A-2002 and other standards as noted. • The MGB shall be insulated from its support structure. A minimum 51 mm (2 in.) separation from the supporting surface is recommended to allow access to the rear of the bus bar. 5-12 68P81089E50-B 9/1/05 HVAC UNIT HVAC EQUIPMENT GROUNDING CONDUCTOR TER GROUND RING. SOFT-DRAWN TINNED SOLID COPPER CONDUCTOR RUN 30" MIN. OR BELOW FROST LINE. WEEN UTILITY GROUND AND SHELTER COUNTERPOISE. NO. 2T, SOFT-DRAWN TINNED SOLID COOPER CONDUCTOR
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS • The MGB grounding conductor shall extend from the MGB to the grounding electrode system with the shortest and straightest routing possible (ANSI T1.334-2002). • When the communications system is located in a large or multi-story building, the MGB grounding conductor shall extend from the MGB to the service equipment (power) ground with the shortest and straightest routing possible. • The MGB grounding conductor shall be of a copper material and may be insulated. If the conductor is insulated, the jacket shall be listed for the application as described within this chapter (ANSI T1.334-2002). • When bonding back to an external grounding electrode system, it is strongly recommended that the MGB grounding conductor be multi-stranded, bare, individually tinned, copper. • The MGB grounding conductor shall be 35 mm2 csa (#2 AWG) minimum, and shall not be smaller than the largest ground bus conductor or equipment grounding electrode conductor installed within the internal grounding system (ANSI T1.334-2002, and NFPA 70-2005, Article 250.64(F)). • The MGB grounding conductor shall be secured to the MGB by exothermic welding, listed compression two-hole lug, or irreversible compression-type connection device (ANSI T1.334-2002). • The MGB grounding conductor shall be bonded to the external grounding electrode system with an exothermic weld or a listed irreversible compression device (ANSI T1.334-2002). • Where exposed to physical damage, the MGB grounding conductor shall be protected and the conductor or its enclosure shall be securely fastened to the surface on which it is carried (NFPA 70- 2005, Article 250.64(B)). • The MGB grounding conductor should be free of any splices. Should a splice in the grounding electrode conductor become necessary, splicing shall be permitted only by listed irreversible compression-type connectors or by the exothermic welding process (NFPA 70-2005, Article 250.64(C)). • The MGB grounding conductor shall be run to the grounding electrode system in a direct manner with no sharp bends or narrow loops. The grounding conductor bend angles (included angle) shall not be less than 90 degrees nor have a bending radius of less than 203 mm (8 in.) (ANSI T1.313- 2003). When routing the MGB grounding conductor through a perimeter wall to the external grounding electrode system, the grounding conductor should be routed through the wall in a PVC or flexible non-metallic conduit sleeve at a 45 degree angle towards the grounding electrode system. See Figure 5-9 for an example of MGB grounding electrode conductor routing. 68P81089E50-B 9/1/05 5-13
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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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