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EME ACTION THRESHOLDS SUMMARY APPENDIX A: ELECTROMAGNETIC ENERGY INFORMATION Controlled MPE 1000% FIGURE A-15 EME ACTION THRESHOLDS EME Action Thresholds Post Warning Sign Only broadcast contractors allowed EME protective hood High level EME site-specific awareness 300% Post Caution sign EME protective coveralls Site-specific EME awareness 100% Post Notice sign Post EME Site Guidelines General EME awareness Rf Qualified And Trained Worker General Site Worker 20% No procedures required General Public A-28 68P81089E50-B 9/1/05
APPENDIX B SOIL RESISTIVITY MEASUREMENTS B Soil resistivity directly affects the design of a grounding (earthing) electrode system and is the prime factor that determines the resistance to earth of a grounding electrode or grounding electrode system. Therefore, prior to the design and installation of a new grounding electrode system, the proposed location shall be tested to determine the soil's resistivity. (See BS 7430:1998, IEEE STD 81, and MIL-HDBK-419A for more information.) The terms “grounding” and “earthing” are used synonymously throughout this appendix. B.1 SOIL RESISTIVITY VARIABILITY AND FACTORS AFFECTING SOIL RESISTIVITY Soil resistivity varies widely by region due to differences in soil type and changes seasonally due to variations in the soil's electrolyte content and temperature. Therefore, it is recommended that these variations be considered when assessing soil resistivity. To help ensure expected grounding (earthing) electrode system resistance values are achieved throughout the year, worstcase soil resistivity values should be considered when designing a grounding electrode system. Table B-1 lists ranges of soil resistivity for various types of soil. The values in Table B-1 are the expected values that should be seen when measuring soil resistivity. NOTE: An ohm-centimeter (Ω-cm) is the resistance in ohms (Ω) of a one inch cube of soil, measured from opposite sides of the cube. TABLE B-1 SOIL RESISTIVITY FOR VARIOUS SOIL TYPES Soil Type Resistivity (Ω-cm) Minimum Average Maximum Ashes, brine, or cinders 590 2,370 7,000 Concrete (below ground) 3,000 Clay, gumbo, loam, or shale 340 4,060 16,300 Clay, gumbo, loam, or shale with varying portions of sand and gravel Gravel, sand, or stone with little clay or loam 1,020 15,800 135,000 59,000 94,000 458,000 68P81089E50-B 9/1/05 B-1
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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 381 and 382: STANDARDS AND GUIDELINES FOR COMMUN
Page 405 and 406: APPENDIX A ELECTROMAGNETIC ENERGY I
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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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