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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) 5.3.2.2 LOCATION When used, the SSGB shall be located within the communications equipment room or area at the point where it is most convenient to terminate all ground (earth) bus conductors. Although not recommended, and not a good design practice, occasionally exterior transmission lines and other telecommunication cables must enter an area served with a SSGB (i.e., not served by the MGB). In these instances special design criteria must be considered to ensure that potential differences between the location of the SSGB and the MGB are minimized. For these applications, additional surge suppression devices may be required on any interconnecting power, data, audio, telephone or telephone type circuits, even though they are routed within the same building. If the SSGB serving a transmission line or other communication cable entry point is located more than 6.1 linear metres (20 linear feet) from the MGB’s grounding electrode system (the point where the MGB grounding electrode conductor enters the earth), the SSGB shall have a properly sized grounding electrode conductor installed directly to the site's common grounding electrode system with the shortest and straightest routing possible (NFPA 70-2005, Articles 800.100, 810.21, 820.100 and 830.100). Consultation with Motorola Engineering or other engineering firm is suggested in these instances. For communication sites installed in large or multi-story commercial buildings, a SSGB shall be located inside each communications equipment room. A SSGB shall be installed as close to the panelboard as is practicable, with adequate clearance around it to comply with applicable local electrical codes. Where a panelboard for the communications equipment is not installed within the room, the SSGB should be located near the communication bonding backbone conductor at a location that allows the shortest routing of the grounding conductors. Multiple SSGBs may also be installed within the same room to aid in minimizing bonding conductor length and terminating space. Multiple SSGBs within a room shall be bonded together with a conductor of the same size as the communication bonding backbone conductor, with splice bars, or as described within this chapter. (See ANSI-J-STD- 607-A-2002 for additional information.) See Figure 5-41 on page 5-67. 5.3.2.3 BONDING THE SSGB TO THE GROUNDING (EARTHING) SYSTEM The installation specifications for the SSGB and the acceptable methods for bonding the SSGB back to the site's grounding system are listed below. The following requirements come from ANSI-J-STD-607- A-2002 and other standards as noted. • The SSGB 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. • The SSGB 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). • The SSGB grounding conductor shall be 35 mm2 csa (#2 AWG) or coarser, and shall not be smaller than the largest ground bus conductor or equipment grounding conductor bonded to it (ANSI T1.334-2002 and NFPA 70-2005, Article 250.64(F)). • The SSGB grounding conductor shall be secured to the SSGB by exothermic welding, listed compression two-hole lug, or irreversible compression-type connection device (ANSI T1.334- 2002). • The SSGB grounding conductor should be free of any splices. Should a splice in the grounding conductor become necessary, splicing is be permitted only by listed irreversible compression-type connectors or by exothermic welding (NFPA 70-2005, Article 250.64(C)). 5-18 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS • The SSGB grounding conductor shall be bonded to the MGB, a collocated SSGB, or to a communication bonding backbone conductor as described within this chapter. • When its required that the SSGB be bonded back to the external grounding electrode system, it is strongly recommended that the SSGB grounding electrode conductor be multi-stranded, bare, individually tinned, copper. • The SSGB grounding electrode conductor shall be bonded back to the external grounding electrode system with an exothermic weld or a listed irreversible compression device (ANSI T1.334-2002). • SSGB grounding electrode conductors located in areas with the potential for physical damage 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 SSGB grounding electrode 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). See Figure 5-13. Radius The radius of any bend shall not be less than 203 mm (8 in.) 90 degrees minimum The angle of any bend shall not be less than 90 degrees. FIGURE 5-13 ACCEPTABLE GROUND CONDUCTOR BENDING • When routing the SSGB 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. • The SSGB grounding conductor should not be placed in ferrous metallic conduit. If local building codes require metallic conduit or sleeves, the grounding electrode conductor shall be bonded to each end of the conduit using a listed grounding bushing or a bonding jumper of the same size, or coarser than, the required enclosed grounding electrode conductor (ANSI-J-STD-607-A-2002, ANSI T1.334-2002, ANSI T1.313-2003 and NFPA 70-2005, Article 250.64(E)). • Unless both ends of the grounding conductor are clearly visible, the conductor shall be clearly labeled on both ends (ANSI T1.333-2001). In large and multi-story commercial buildings, each communication grounding and bonding conductor should be labeled as close as practicable to its point of termination in a readable location. The label shall be nonmetallic and should include the information shown below (ANSI-J-STD-607-A-2002). IF THIS CONNECTOR OR CABLE IS LOOSE OR MUST BE REMOVED, PLEASE CALL THE BUILDING TELECOMMUNICATIONS MANAGER 68P81089E50-B 9/1/05 5-19
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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 161 and 162: 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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