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BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING) When a cable tray system has been installed with a single section routing perpendicular to the MGB or SSGB, the cable tray section nearest to the bus bar shall have an equipment grounding conductor installed between one of the cable tray side rails and the MGB or SSGB. The grounding conductor shall be installed with the shortest and straightest routing possible. See Figure 5-29 for an example of this type of configuration. MGB MGB MGB PARALLEL CONFIGURATION SINGLE SECTION CONFIGURATION FIGURE 5-29 CABLE TRAY GROUNDING CONFIGURATIONS When a cable tray system has been installed with a “U” shape section routing perpendicular to the MGB or SSGB, each cable tray section nearest to the bus bar shall have an equipment grounding conductor installed between the cable tray side rail and the MGB or SSGB. Each grounding conductor shall be installed with the shortest and straightest routing possible. See Figure 5-29 for an example of this type of configuration. When a cable tray has been installed parallel to the MGB or SSGB, the cable tray section nearest to the bus bar shall have two equipment grounding conductors installed to provide a bidirectional flow path back to the MGB or SSGB. Each grounding conductor shall be installed with the shortest and straightest routing possible See Figure 5-29 for an example of this type of configuration. 5.5.1.6 ANCILLARY SUPPORT APPARATUS All ancillary support apparatus within an equipment shelter, room or specific equipment area shall be bonded to the MGB. In areas other than where the MGB is installed, ancillary support apparatus shall be bonded to the SSGB, or to the internal perimeter ground (earth) bus conductor (IPGB), using an equipment grounding conductor and methods described within this chapter. Manufacturers' installation instructions shall be followed when bonding ancillary support apparatus to the site grounding system. Connections shall be made to the terminal provided or some other suitable point on the apparatus. Ancillary support apparatus includes but is not limited to: • Storage cabinets • Battery racks • Metallic window frames, doors and door frames • Metallic ceiling grids PERPENDICULAR CONFIGURATION 5-46 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM • Metallic raised flooring systems • HVAC grills, ducts, units, motors, motor controllers, control panels, junction and terminal boxes • Panelboards • Switchboards • Automatic and manual transfer switches • Transformers • UPS units • Metallic housing of AC power surge suppressor devices • Primary surge suppressor ground terminals The following shall also be bonded to the MGB, SSGB or IPGB system: • All metallic support apparatus, including metallic conduits, within an equipment shelter, room, a generator or power distribution room, or specific equipment area and located within 2.4 m (8 ft.) vertically or 1.5 m (5 ft.) horizontally of ground or grounded metal objects (NFPA 70-2005, Article 250 (VI)). • Rigid Metallic Conduit (RMC) and Electrical Metallic Tubing (EMT). EXCEPTION: when the conduits are effectively joined with threaded coupling, threadless coupling, or threadless compression connector, that terminate in bonded metallic enclosures, they may be considered adequately bonded and do not require additional bonding (ANSI T1.334-2002). • If metallic conduit does not meet the above specifications, the electrical metallic conduits shall be bonded to the IPGB conductor at any point where they cross within 152 mm (6 in.) of the IPGB conductor. • Metallic conduit run parallel to the IPGB conductor shall be bonded at the points where it enters to within 152 mm (6 in.) of the IPGB conductor and at the point where it transitions away from the IPGB conductor. • All set-screw type connectors and couplings shall be bridged with a bonding jumper. • Each metallic conduit may be connected to the IPGB conductor with a continuous equipment grounding conductor using removable saddle clamps or other clamps that specifically permit the use of a single continuous conductor for grounding multiple runs of conduit. If multiple conduits are grounded using a single conductor, the conductor shall be clamped to each conduit run such that removal of one clamp does not interrupt the path to ground for the other conduit runs. See Figure 5-30 on page 5-48. 68P81089E50-B 9/1/05 5-47
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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 189 and 190: STANDARDS AND GUIDELINES FOR COMMUN
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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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