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RF COMPONENTS PROTECTION CHAPTER 7: SURGE PROTECTIVE DEVICES Transmission lines to antennas Cable entry port Equipment installed in a stand alone building or shelter. Transmission lines to antennas Cable entry port Equipment building or shelter Equipment installed in a stand alone building or shelter with SPDs installed within the cable entry port. Transmission lines to antennas SPDs Building cable entry porttypically at roof level Building exterior wall SPDs installed a maximum of 61 cm (2 ft.) from entry port Transmission lines to equipment Equipment building or shelter Equipment area cable entry port Equipment area within larger building Transmission lines to equipment Equipment installed in an equipment room or area within a larger building. NOTE: Grounding and electrical details not shown. SPDs within cable entry port Transmission lines to equipment Building typically a multi-story or high rise type with transmission line entry at roof level and equipment room several floors below. FIGURE 7-22 TRANSMISSION LINE SPD INSTALLATION LOCATIONS 7-42 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES RF COMPONENTS PROTECTION 7.6.2 SURGE PROTECTION CONSIDERATIONS FOR DISPATCH CENTERS AND OPERATOR POSITIONS Dispatch centers co-located with communications towers require special protection considerations due to the critical nature of their operation and due to the inherent risk to personnel from lightning. For optimum dispatch center protection, the following shall be considered: • Site design recommendations given in “Design Considerations to Help Reduce Effects of Lightning” on page 2-19. • Internal grounding and bonding as defined in “Grounding (Earthing) for Dispatch Centers and Network Operator Positions” on page 5-62. • Electrostatic discharge (ESD) precautions as defined in Appendix B. • External grounding as defined in “External Grounding (Earthing) For Dispatch Centers Co-located With Communications Towers” on page 4-81. • Transient Voltage Surge Suppression as follows: 7.6.2.1 MINIMUM SPD REQUIREMENTS • Type-2 (min) service panel SPDs shall be required for AC electrical panels servicing the dispatch operations center and shall be located so as to provide the most effective surge protection (see “Installation Requirements” on page 7-33). • Type-1 (min) SPDs are required for UPS panelboards located within the dispatch operations center when the UPS system is located more than 15.2 m (50 ft.) from the center. • Type-3 SPDs are required for each dispatch operator position. Type-3 SPDs used shall be qualified Motorola compliant devices and must incorporate an external ground (earth) stud or connection point and shall be grounded to the operator position ground bus bar in accordance with ANSI T1.321-R2000. • Telephone and network interface cables shall be surge protected and grounded as described under “Telephone/Control/Data Network Circuit SPDs” on page 7-34. Additional surge protection for headset jack interface points is recommended to reduce the possibility of shock or discomfort caused by lightning and electrostatic discharge (ESD). Headset protection units shall be grounded to the operator position ground bus bar. NOTE: ESD is generally the cause for many complaints generated by dispatch personnel. Measures to control ESD shall be taken when designing for this environment. Most ESD problems are mitigated through proper bonding and grounding techniques, relative humidity control (between 40% and 55% relative humidity is ideal) and attention to the resistivity of flooring and furniture. Video Display Terminals (VDT), keyboards and the mouse are additional areas where energy can build up between the equipment and personnel. Proper static resistive mats and pads can reduce discomfort and injury caused by ESD. Cathode tubes used in some VDTs generate powerful electrical fields, and while there are screens and mats to help to minimize the effects of electrostatic discharge between equipment and personnel, it does not negate the need for training personnel on the proper skills to avoid coming in contact with ESD. 68P81089E50-B 9/1/05 7-43
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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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Page 301 and 302: STANDARDS AND GUIDELINES FOR COMMUN
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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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