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SPECIAL GROUNDING (EARTHING) SITUATIONS CHAPTER 4: EXTERNAL GROUNDING (EARTHING) THIS PAGE INTENTIONALLY LEFT BLANK. 4-100 68P81089E50-B 9/1/05
CHAPTER 5 INTERNAL GROUNDING (EARTHING) 5 This chapter provides requirements for grounding (earthing) communications site equipment within a facility. The following topics are included: • “Common Grounding (Earthing)” on page 5-3 • “Grounding (Earthing) System Components and Installation Requirements” on page 5-4 • “Connection Methods for Internal Grounding (Earthing) System” on page 5-31 • “Bonding Equipment to Internal Grounding (Earthing) System” on page 5-40 • “Grounding (Earthing) for Stand-alone Equipment Shelters” on page 5-54 • “Grounding (Earthing) for Small, Large, and Multi-Story Buildings” on page 5-58 • “Grounding (Earthing) for Dispatch Centers and Network Operator Positions” on page 5-62 • “Grounding (Earthing) for Integrated Communication Sites” on page 5-68 NOTE: Throughout this chapter the terms grounding and earthing are used synonymously. 5.1 INTRODUCTION Proper bonding and grounding (earthing) of equipment is essential for personnel safety and system reliability. Because of the increase in circuit density and the advent of lower-voltage integrated circuit devices, communications systems equipment is now more vulnerable than ever to damage resulting from lightning activity and power line anomalies. Inadequate or improper equipment bonding and grounding can permit a difference of ground potential to exist between system components, which may result in injury to personnel, system failure, and equipment damage. The requirements and guidelines in this chapter are derived from a compilation of local and national codes, widely accepted industry codes and standards, and good engineering practices. Such codes and standards are from, but not limited to, the following standards organizations: • American National Standards Institute (ANSI) • Institute of Electrical and Electronics Engineers (IEEE) • National Fire Protection Association (NFPA) • Telecommunications Industry Association (TIA) • Underwriters Laboratories (UL) • United States Department of Defense (DoD) • United States Federal Aviation Administration (FAA) • United States National Weather Service References to the specific industry codes and standards on which this chapter is based are provided throughout. The requirements and guidelines in this chapter are provided to enhance personnel safety and equipment reliability. 68P81089E50-B 9/1/05 5-1
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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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Page 143 and 144: 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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