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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) Depending on the building construction, building size, communication system requirements, and the telecommunication cable pathways, one or more communication bonding backbone conductors may be installed. Each communication bonding backbone conductor shall be consistent with the design of the communication bonding backbone cabling system, and it shall be installed so that it is protected from physical damage. Typically when the equipment rooms or areas are located on different floors of a large multi-story building, a separate communication bonding backbone conductor is routed up each of the opposite sides of the building. To equalize potential, the communication bonding backbone conductors are bonded together with a grounding equalizer conductor at the top floor and at a minimum of every third floor in between using methods described within this chapter (ANSI-J-STD-607-A-2002). 5.3.6.2 SPECIFICATIONS All communication bonding backbone conductors and grounding (earthing) equalizer conductors shall be established of 35 mm 2 csa (#2 AWG) or coarser, solid or stranded copper conductor. When the conductors are jacketed, they shall be listed for the space in which they are intended to be placed and the jacket shall be green or properly marked with a distinctive green color (ANSI-J-STD-607-A-2002). In the buildings that do not have effectively bonded structural steel, additional conductor sizing should be considered. All communication bonding backbone conductors and grounding equalizer conductors shall be of the same size. The linear length of a 35 mm 2 csa (#2 AWG) communication bonding backbone conductor or a grounding equalizer conductor should not exceed 10 m (33 ft.). If a greater conductor length is required, these conductors should be sized at 2 kcmil per linear foot of conductor length up to a maximum size of 95 mm 2 csa (#3/0 AWG). See Table 5-3 and Table 5-4 on page 5-27 for conductor sizing requirements (ANSI-J-STD-607-A-2002; MIL-HDBK-419A). All communication bonding backbone conductors and grounding equalizer conductors should be installed without splices. When splices are necessary, the number of splices shall be kept to a minimum and the splices shall be accessible and located in telecommunication spaces (ANSI-J-STD-607-A-2002). All communication bonding backbone and grounding equalizer conductor splices shall be established using suitable methods described within the chapter. NOTE: The interior water piping system of the building and metallic cable shields shall not be used as communication bonding backbone conductors or grounding equalizer conductors (ANSI-J-STD-607-A-2002). Each equipment area's main SSGB shall be bonded to the communication bonding backbone conductor or to the grounding equalizer conductor with a grounding conductor of the same size as the communication bonding backbone conductor using suitable methods described within this chapter. The building's MGB shall be bonded to the service equipment (power) grounding electrode system using a grounding conductor of the same size as the communication bonding backbone conductor by using suitable methods described within this chapter (ANSI-J-STD-607-A-2002). 5-26 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS TABLE 5-3 SIZING OF GROUND BUS CONDUCTORS Conductor length in linear m (ft) Conductor size in mm 2 csa (AWG / MCM) Less than 10 (33) 33.62 (2) 10 – 13 (34 – 41) 42.41 (1) 13 – 16 (42 – 52) 53.49 (1/0) 16 – 20 (53 – 66) 67.43 (2/0) 20 – 25 (67 – 84) 85.01 (3/0) 1 25 – 32 (85 – 105) 107.26 (4/0) 32 – 38 (106 – 125) 126.70 (250 MCM) 38 – 53 (126 – 175) 177.39 (350 MCM) 53 – 76 (176 – 250) 253.35 (500 MCM) Greater than 114 (251 – 375) 380.13 (750 MCM) 1. Maximum wire size required by this standard. The remaining five wire sizes shown are recommendations for the given respective lengths. TABLE 5-4 STANDARD WIRE SIZES AVAILABLE FOR INTERNATIONAL MARKET Conductor size in mm 2 csa Conductor size in AWG / MCM 6 10 10 8 16 6 25 4 35 2 50 1/0 75 2/0 95 3/0 120 4/0 150 300 MCM 185 350 MCM 240 500 MCM 300 600 MCM 400 800 MCM 68P81089E50-B 9/1/05 5-27
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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 169 and 170: 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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