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MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) GRADE COPPER GROUND ROD STEEL ANCHOR SHAFT 1 2 1. CORROSION FROM STEEL ANCHOR SHAFT TO COPPER GROUND ROD AND OTHER COPPER GROUNDING ELECTRODE SYSTEM COMPONENTS 2. CORROSION FROM STEEL ANCHOR SHAFT TO THE PORTION OF ANCHOR SHAFT ENCASED IN CONCRETE (STEEL ENCASED IN CONCRETE IS SIMILAR TO COPPER.) FIGURE 4-37 GUY ANCHOR GALVANIC CORROSION EXAMPLE • All guy wires at a guy anchor point shall bond to the ground rod (ANSI T1.313-2003, section 10.3.1, and ANSI/TIA/EIA-222-F-R2003) using a grounding conductor of 35 mm2 csa (#2 AWG) or coarser, bare, solid, tinned copper conductor. Do not use un-tinned wire. • The grounding conductor shall be connected to each guy wire using stainless steel or other approved clamps. Each connection shall be coated with a listed conductive anti-oxidant compound. 4-56 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES MINIMUM SITE GROUNDING (EARTHING) REQUIREMENTS CAUTION Do not attempt to exothermically weld to tower guy wires. • The grounding conductor shall be connected to the guy wires above the turnbuckles (see Figure 4-38). • The grounding conductor shall maintain a continuous vertical drop from the guy wire attachment point to the grounding electrode. FIGURE 4-38 GUY ANCHOR POINT GROUNDING FOR EXISTING CONSTRUCTION 4.7.6.2.2 CATHODIC PROTECTION Additional corrosion control can be obtained through the use of Cathodic Protection. See MIL-HDBK- 419A Volume I, section 2.10 and TIA/EIA-222-F-R2003, section 4.4 for additional information. Cathodic protection should only be installed under the advice of a licensed professional engineer. WARNING GUY WIRE CLAMPS 35 mm 2 CSA (#2 AWG) TINNED COPPER GROUNDING CONDUCTOR GRADE 610 mm (2 FT) MINIMUM CONCRETE ANCHOR GALVANIZED GROUND ROD 2.4 M (8 FT) MINIMUM ANCHOR SHAFT SURROUNDED BY 152 mm (6 IN.) OF GRAVEL Any type of corrosion control installation techniques does not eliminate the need for proper monitoring and maintenance over the life of the structure (TIA/EIA-222-F-R2003, section 4). 68P81089E50-B 9/1/05 4-57
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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 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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