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GROUNDING (EARTHING) ROOF-MOUNTED ANTENNA MASTS AND METAL SUPPORT STRUCTURES CHAPTER 4: EXTERNAL GROUNDING (EARTHING) 35 mm 2 csa (#2 AWG) CONDUCTOR FIGURE 4-55 SIDE-MOUNTED ANTENNA GROUNDING USING COPPER STRAP DOWN CONDUCTOR When multiple side mounted antennas are installed together, a single horizontal grounding conductor should bond all antenna masts together. The horizontal grounding conductor should bond to the grounding electrode system from each side of the side mounted antennas with a grounding downconductor. When several antennas are installed together, therefore, creating a long horizontal grounding conductor, it is recommended to install intermediate grounding down-conductors every 6.1 m (20 ft.). ANTENNA MOUNT 35 mm 2 csa (#2 AWG) CONDUCTORS ANTENNA MOUNT EGB EGB ANTENNA TRANSMISSION LINE GROUND KIT GROUND RODS ANTENNA GROUND RODS TRANSMISSION LINE GROUND KITS FIGURE 4-56 GROUNDING OF MULTIPLE SIDE-MOUNTED ANTENNAS 508 mm (2 in.) STRAP (RECOMMENDED) 35 mm 2 csa (#2 AWG) MINIMUM ELECTRICAL SERVICE ELECTRICAL SERVICE 4-78 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) ROOFTOP MOUNTED TOWER STRUCTURES 4.9 GROUNDING (EARTHING) ROOFTOP MOUNTED TOWER STRUCTURES Rooftop mounted towers may increase the lightning risk index for the buildings they are installed upon. Due to their increased height and lightning risk probability, all exposed buildings with rooftop towers shall be equipped with a lightning protection system, as outlined in NFPA 780-2004 (ANSI T1.313- 2003, section 10.3.3). See “Lightning Activity and Exposure” on page 4-3 for information regarding lightning exposure to buildings and towers. NOTE: Consult the building engineer or manager to determine information about any existing building grounding (earthing) electrode systems. The building engineer should also be informed before attempting to weld or drill on the building rooftop. An engineering firm specializing in the design and installation of lightning protection systems should be consulted for proper design and installation of the building lightning protection system. A licensed contractor specializing in the installation of lightning protection systems should be used. The lightning protection system shall be constructed of only listed components. The lightning protection system shall meet the requirements of BS 6651:1999, IEC 61024-1-2, NFPA 780-2004, or other standard in effect and recognized by the local authority having jurisdiction. As a minimum the lightning protection system shall contain the following: • The lightning protection system shall contain a grounding conductor installed around the roof perimeter to form the main roof perimeter lightning protection ring. The main roof perimeter lightning protection ring shall be sized as follows: • The conductor shall be a 35 mm 2 csa (#2 AWG) or coarser, bare, copper or equivalent, for buildings not exceeding 22.9 m (75 ft.) in height (NFPA 780-2004, Table 4.1.1.1(A)). • The conductor shall be a 70 mm 2 csa (#2/0 AWG) or coarser, bare, copper or equivalent, for buildings equal to or exceeding 22.9 m (75 ft.) in height (NFPA 780-2004, Table 4.1.1.1(B)). • Strike termination devices, also known as air terminals, are typically installed along the length of the main roof perimeter lightning protection ring, typically every 6.1 m (20 ft.) or as otherwise required by the standard in effect and recognized by the local authority having jurisdiction. • The main roof perimeter lightning protection ring shall contain at least two down conductors connected to the grounding electrode system. The down conductors shall be physically separated from one another as much as practical. The down conductors shall be sized as follows: • The conductor shall be a 35 mm2 csa (#2 AWG) or coarser, bare, copper or equivalent, for buildings not exceeding 22.9 m (75 ft.) in height (NFPA 780-2004, Table 4.1.1.1(A)). • The conductor shall be a 70 mm2 csa (#2/0 AWG) or coarser, bare, copper or equivalent, for buildings equal to or exceeding 22.9 m (75 ft.) in height (NFPA 780-2004, Table 4.1.1.1(B)). NOTE: Available effectively grounded structural building steel can typically be used as a grounding downconductor. The conductor used to bond the main roof perimeter lightning protection ring to the structural building steel shall be sized as required in this section for down-conductors. See Figure 4-53 on page 4-75 for an example of acceptable structural building steel bonding connections. • Structures exceeding 76 m (250 ft.) in perimeter shall have a down conductor for every 30.5 m (100 ft) of perimeter or fraction thereof (NFPA 780-2004, section 4.9.10.1). 68P81089E50-B 9/1/05 4-79
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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 121 and 122: 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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