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AC POWER CHAPTER 6: POWER SOURCES 6.2.4 INTERIOR ELECTRIC The following requirements shall be observed when specifying and installing interior electrical service: • All panel boards and switch boards shall display signage and placarding per NFPA 70-2005, Article 110.22 and applicable local codes. • When designing a site floor plan with electrical panels utilizing voltages of 600 VAC or less, a clearance of 914 mm (36 in.) shall be provided in front of any electrical panel in accordance with NFPA 70-2005, Article 110.26. • A working space equal to the width of the equipment or 762 mm (30 in.), whichever is greater, shall be provided in accordance with NFPA 70-2005, Article 110.26. • Additional clearance shall be provided based on the voltage present in electrical panel exceeding 120/240 VAC. See Figure 6-2. Depth of working space shall be 914 mm (36 in.) Clear working space shall be equal to width of equipment or 762 mm (30 in.) minimum, floor to ceiling. CEILING Min. 610 mm (24 in.) (Width of Panel) 508 mm (20 in.) H x 610 mm (24 in.) W Panelboard (Switchboard) FLOOR FIGURE 6-2 ELECTRICAL PANEL CLEARANCES Equipment located below Panelboard shall not protrude more than 152 mm (6 in.) beyond Panelboard. • Equipment that operates on 48 VDC, or 600 VAC require different clearance. Clearance shall be in accordance with NFPA 70-2005, Article 110.26, or applicable local codes. • All internal wiring shall be copper. (see NFPA 70-2005, Article 110.5 for additional information). • Power panels, load centers, and breaker boxes shall be identified using distinctive placarding/ labeling identifying their purpose and location of the main service disconnect. (See NFPA 70-2005, Article 110.22 and Figure 8-3 for additional information.) • Wire, terminals and lugs shall be of similar or compatible metals (NFPA 70-2005, Article 110.14). 6-6 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER 6.2.5 POWER PANELS The following requirements shall be observed when specifying and installing interior electrical service: • Each main distribution panel shall have its own main overcurrent protective device (circuit breaker/fuse). (See NFPA 70-2005, Article 408.36(B) for additional information.) • All interior panelboards and junction boxes shall be NEMA Type 1 general purpose for indoor application. • More than one distribution panel may be necessary for large single equipment rooms in order to support the number of required branch circuits. If more than one distribution panel is utilized then all panels should be fed from the same separately derived system. This is done to prevent ground loops from multiple neutral ground bonds at the transformer. (See IEEE STD 1100-1999 for additional information.) • Power panelboards shall be bonded to the interior single point grounding window system. See “Internal Grounding (Earthing)” on page 5-1 for the requirements on the proper methods of grounding and bonding equipment. • When using a UPS, two distinct power panels shall be utilized as follows: • Equipment Power Panel (UPS Panelboard) This panel provides power for the communications equipment and all associated electrically powered items. It is fed from the UPS. • Utility Power Panel This panel provides power for circuits and loads other than the communications equipment. This panel feeds the UPS and non-UPS site electrical equipment such as lighting, HVAC and wall mounted receptacles, etc. 6.2.5.1 OUTDOOR ELECTRICAL (BRANCH CIRCUITS) This paragraph provides requirements for branch circuits that exit the equipment shelter for use with outdoor equipment. • All outdoor electrical equipment shall be protected from the environment and sealed from the elements. • All outdoor receptacles shall be GFCI-type receptacles or breakers. (See NFPA 70-2005, Article 210.8 for additional information.) • Non-flexible conduit shall be used for all exterior circuit branches. An exception are feeds to vibrating equipment such as air conditioning units, which may use liquid-tight flexible sealed conduit. • All exterior wall penetrations through which conduit passes shall be sealed. • Exterior panelboards, receptacles and switches shall be housed in NEMA Type 3 or Type 3R housing. 68P81089E50-B 9/1/05 6-7
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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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Page 221 and 222: STANDARDS AND GUIDELINES FOR COMMUN
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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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