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SITE PREPARATION CONSIDERATIONS APPENDIX B: SOIL RESISTIVITY MEASUREMENTS Plotted values <strong>for</strong> 19 mm (3/4 in.) electrode at 20-ft. depth <strong>for</strong> same meter reading shows lower electrode resistance (7.5 Ω in this example, vs. 15 Ω in previous example). q L R d 90 70 50 30 15 5 3 1 100 80 60 40 20 10 4 2 ρ 7 5 3 1 5/8 1/4 8 6 4 2 3/4 0.5 100 40 20 10 4 2 0.5 50 30 15 5 3 1 90 70 50 30 15 5 3 1 100 80 60 40 20 10 4 2 FIGURE B-6 EXAMPLE WORKSHEET AND NOMOGRAPH (SHEET 3 OF 3) q B-14 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SITE PREPARATION CONSIDERATIONS TABLE B-3 SOIL RESISTIVITY WORKSHEET 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 Location Spacing (Test Depth) ρ = 191.5 × A × R ρ = soil resistivity in Ω-cm A = Distance between test rods (in feet) R = Resistance obtained from tester 1.52 m(5 ft.) 3 m(10 ft.) 6.1 m(20 ft.) 9.1 m(30 ft.) 12.2 m(40 ft.) Meter Readings (steps 2 through 5) Soil Resistivity Calculations (step 10) OR ρ = 628 × A × R ρ = soil resistivity in Ω-cm A = Distance between test rods (in metres) R = Resistance obtained from tester 1 of 5 ρ= ρ= ρ= ρ= ρ= 2 of 5 ρ= ρ= ρ= ρ= ρ= 3 of 5 ρ= ρ= ρ= ρ= ρ= 4 of 5 ρ= ρ= ρ= ρ= ρ= 5 of 5 ρ= ρ= ρ= ρ= ρ= Test completed by: Notes: Date: Client / Project: Site Location/ID: Ground Resistance Tester Model:_______________________________________ S/N:_________________________________________ Calibration date:_______________________________ Soil Description: Ambient Conditions Temperature:_________________________________ Present conditions (dry, rain, snow):_______________ Date of last precipitation:________________________ 68P81089E50-B 9/1/05 B-15
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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 395 and 396: 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
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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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