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SITE PREPARATION CONSIDERATIONS APPENDIX B: SOIL RESISTIVITY MEASUREMENTS COMMUNICATIONS SITE BUILDING 4. Single rod resistance of 15 Ω is then multiplied by 18% (0.18) to obtain the effective resistance of the system: 15Ω × 0.18= 2.7 Ω In this example, effective overall resistance of the proposed system would be 2.7 Ω. TOWER GROUND RODS (8 TOTAL) ADJACENT BUILDINGS FIGURE B-8 EXAMPLE OF MULTIPLE GROUNDING ELECTRODES IN STRAIGHT LINE B-20 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SITE PREPARATION CONSIDERATIONS Combined Resistance (% of Single Rod Resistance) 100 50 40 30 20 10 5 4 3 2 1 S = 1 2 3 4 5 10 20 30 40 50 100 Number of Rods FIGURE B-9 COMBINED RESISTANCE GRAPH (GROUND RODS ARRANGED IN LINE OR RING) 68P81089E50-B 9/1/05 B-21 S = L S = 2L S = 3L S = 4L 8
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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 5 INTERNAL 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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Page 401 and 402: STANDARDS AND GUIDELINES FOR COMMUN
Page 405 and 406: APPENDIX A ELECTROMAGNETIC ENERGY I
Page 433 and 434: APPENDIX B SOIL RESISTIVITY MEASURE
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Page 467 and 468: APPENDIX C PROTECTING AGAINST ELECT
Page 471 and 472: APPENDIX D GROUNDING (EARTHING) ELE
Page 497 and 498: 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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