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GROUNDING (EARTHING) SYSTEM COMPONENTS AND INSTALLATION REQUIREMENTS CHAPTER 5: INTERNAL GROUNDING (EARTHING) 5.3.9 BONDING JUMPERS A bonding jumper is used to ensure an electrically conductive path between components. Examples include sections of a cable tray which are required to be bonded together, or sections of structural steel, roof trusses, piping systems, conduits or other metallic surfaces that are required to be bonded together to maintain electrical conductivity. A bonding jumper shall not be used in lieu of an equipment grounding (earthing) conductor. 5.3.9.1 LOCATION Bonding jumpers shall be installed to bond components of the same or similar structure together. The location will be dependent on the specific application. Bonding jumpers shall be as short as possible, shall be routed in as straight a line as possible, and shall be as free from bends as is practicable. Care shall be taken to ensure that attachment points are clean and free of paint, corrosion or non-conductive materials. Suitable listed lugs shall be used to facilitate attachment to the components as described within this chapter. See Figure 5-18 for an example of for an example of a cable tray section bonding jumper. FIGURE 5-18 BONDING CABLE TRAY SECTIONS 5.3.9.2 SPECIFICATIONS Bonding jumpers shall be 16 mm 2 csa (#6 AWG) or coarser, solid or stranded copper conductor. A stranded conductor may be more desirable due to the ease of installation and maintainability. When the conductors are insulated, 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 and NFPA 70-2005, Article 250.119). When bonding jumpers are installed outside a raceway or enclosure, their conductor length shall not exceed 1.8 m (6 ft.) (NFPA 70-2005, Article 250.102(E)). 5-30 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM 5.4 CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM All components of the internal grounding (earthing) system and all equipment and ancillary support apparatus including, but not limited to, items listed in Table 5-6 on page 5-40 shall be effectively bonded together by using the following requirements and connection methods described within this chapter: • General bonding requirements • Bonding to equipment and ancillary support apparatus • Bonding to the MGB • Bonding to SSGB • Bonding to RGB • Bonding to ground bus conductor • Bonding to communication bonding backbone conductors and grounding equalizer conductors 5.4.1 GENERAL BONDING REQUIREMENTS The following requirements shall apply when attaching conductors to equipment, ancillary support apparatus, ground (earth) bus bars, and when attaching one conductor to another. • Only connection devices that require the complete removal of the conductor jacket or insulation and result in a connection to the complete conductor surface area shall be suitable for use. • All mechanical and compression-type connection devices shall be UL 486A listed and of the proper size for the application. These connection devices shall be tin-plated when connected with steel, galvanized steel or aluminum surfaces. • All clamps and compression-type connection devices shall be UL 486A listed and shall maintain a minimum 88% conductivity rating. • Compression systems shall include crimped die index and company logo for purposes of inspection. • Listed two-hole, long barrel, compression lugs are preferred over single-hole lugs and shall be required where two-hole lugs are referenced within this chapter. • No more than one clamp, fitting or lug may be attached by the same bolt or bolts. An exception to this is when a jumper from a terminal strip or other internal connection point of the same equipment must be bonded to the equipment grounding conductor. • No more than one conductor shall be connected by a single clamp, fitting or lug unless the clamp, fitting, or lug is listed for multiple conductors. • Solid conductors shall be attached to lugs and to other conductors by irreversible high compression crimping process. Only listed irreversible compression type lugs and connection devices shall be used. • Connections between dissimilar metals shall not be made unless the conductors are separated by a suitable material that is a part of the attachment device. Only attachment devices listed and approved for use with the specific dissimilar metals may be used for this purpose. 68P81089E50-B 9/1/05 5-31
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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 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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