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GROUNDING (EARTHING) FOR DISPATCH CENTERS AND NETWORK OPERATOR POSITIONS CHAPTER 5: INTERNAL GROUNDING (EARTHING) At the location where telecommunications cabling enters the building, the metallic shields shall be bonded to the building's grounding system by one of the methods described in paragraph 5.5.1.8.4 beginning on page 5-51. Where internal backbone telecommunication cables (telephone system cables) incorporate a shield or metallic member, the shield or metallic member shall be effectively bonded to the closest MGB or main SSGB with a 16 mm 2 csa (#6 AWG) or coarser green jacketed grounding conductor at the point where cables terminate or where they are broken out. Primary SPDs for interbuilding communication cables shall be bonded to the MGB or SSGB with a 16 mm 2 csa (#6 AWG) or coarser, green jacketed grounding conductor as described in paragraph 5.5.1.8.2 on page 5-50. When secondary SPDs are installed at the equipment location, the SPD grounding conductor shall be effectively bonded to the closest MGB or SSGB as described in paragraph 5.5.1.8.3 on page 5-51. Where external antenna cables enter the building, that point of entry shall be treated as a cable entrance location (ANSI-J-STD-607-A-2002). The cable entrance location shall have an accessible bonding location to the building's common grounding electrode system (e.g., an external ground bus bar or structural building steel). The outer metallic shields of each transmission line and other communications cables shall be bonded to the building's common grounding electrode system (NFPA 70-2005, Articles 770.93, 800.100, 810.20, 820.93, 820.100, and 830.100). See “External Ground Bus Bar” on page 4-30 for additional information. 5.8 GROUNDING (EARTHING) FOR DISPATCH CENTERS AND NETWORK OPERATOR POSITIONS Dispatch centers co-located with communication towers require special protection considerations due to the critical nature of their operation and due to the inherent risk to personnel from lightning events. For optimum protection of a dispatch center, the following shall be considered: • Site design recommendations given in “Design Considerations to Help Reduce Effects of Lightning” on page 2-19. • External grounding (earthing) and bonding as defined in Chapter 4, “External Grounding (Earthing).” • Transient voltage surge suppression (TVSS) as defined in “Telephone/Control/Data Network Circuit SPDs” on page 7-34. • Electrostatic discharge (ESD) precautions as defined in Appendix C. This section provides electrical protection measures that are intended to help protect network operators, and to help ensure reliable equipment operation during periods of lightning activity or surges from AC power lines and power switching operations. 5-62 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GROUNDING (EARTHING) FOR DISPATCH CENTERS AND NETWORK OPERATOR POSITIONS 5.8.1 GROUNDING (EARTHING) AND PROTECTION OF INCOMING POWER AND TELECOMMUNICATION CABLES To minimize the effects of lightning and AC power surges at the facility, a common internal grounding (earthing) system shall be installed as described in “Grounding (Earthing) for Small, Large, and Multi- Story Buildings” on page 5-58. Applicable surge protection devices shall be installed on all incoming power lines and telecommunication cables as described in Chapter 7, “Surge Protective Devices,” and the surge protection devices shall be effectively bonded back to the common internal grounding system as described in this chapter. All outside facility telecommunication cables entering the building and their surge protection devices shall be effectively bonded back to the internal grounding electrode system as described within this chapter. Any co-located Lightning Protection System (LPS), communication tower, or outside mounted antenna shall also be effectively bonded back to the site's common grounding electrode system as described in Chapter 4, “External Grounding (Earthing).” 5.8.2 GROUNDING (EARTHING) OF EQUIPMENT ROOMS LOCATED WITHIN THE DISPATCH CENTER All communications system equipment rooms located in the same building and fed by the same electrical service shall have a single point grounding (earthing) location established within the room or space. This location can be the communications system MGB, an SSGB, or a properly sized ground bus conductor. In all cases, the single point grounding location shall be effectively bonded back to the communications system common internal grounding system as described within this chapter. NOTE: Buildings or campuses with more than one electrical service entrance, each of which serves the communication system, require special design considerations that are beyond the scope of this manual. Consultation with Motorola Engineering or with an engineering firm specializing in grounding system design is recommended in these instances. All interconnect communications system equipment and ancillary support equipment located within the communication equipment room shall be effectively bonded back to the single point grounding location in accordance with the requirements within paragraphs 5.5.1.3 and 5.5.1.4 on page 5-44, and 5.5.1.6 on page 5-46. All voltage limiting SPDs located within the communication equipment room shall be effectively bonded to the single point grounding location in accordance with paragraph 5.5.1.8 and the associated paragraphs beginning on page 5-49. 68P81089E50-B 9/1/05 5-63
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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 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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