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AC POWER CHAPTER 6: POWER SOURCES 6.2.9 HARDWIRING OF EQUIPMENT AND DEDICATED RECEPTACLES Extension cords shall not be used to power permanent communication equipment at a site. When an open equipment rack is used, hardwiring of power is not always possible. Mounting a dedicated simplex receptacle or receptacle assembly on the rack may be the most convenient method of supplying power, especially if multiple pieces of equipment are mounted on the rack. This is also a convenient way to install personal protection Type 3 SPD devices to the equipment. These receptacle assemblies can be pre-manufactured and mounted to the top face of an equipment rack. Mounting can also use a fabricated power pole mounted between racks. 6.2.10 RECEPTACLES The following requirements shall be observed when specifying and installing receptacles for powering communications equipment: • To ensure reliability, each major piece of equipment and each half of a redundant power supply shall have its own dedicated individual branch circuit and dedicated simplex receptacle. • Equipment racks may require special attention to support the dedicated simplex receptacle scheme. To comply with the dedicated simplex receptacle concept, receptacles have to be located on or very near the rack of equipment. One method is to use a specialized Multi-Receptacle AC panel with dedicated circuits that shall be mounted on the equipment rack or enclosure. (These Multi- Receptacle AC panels shall be hard wired to the breaker panel, and each simplex receptacle shall use an individual branch circuit.) • To eliminate the possibility of two pieces of equipment turning on at the same time and momentarily exceeding the amperage capacity of the circuit, simplex receptacles should be used instead of duplex receptacles. NOTE: Duplex receptacles may be fed from two separate circuits only if the connecting tabs on the receptacles are removed. The neutral shall not be shared by two receptacles. In this case, only one equipment grounding conductor is required for the two circuits. • Receptacle ratings should be determined by conductor and circuit breaker current ratings. Consider future expansions. • Isolated ground receptacles should not be used unless recommended by the equipment manufacturer (IEEE STD 1100-1999). Isolated ground receptacles are not recommended for use at operator positions. See “Grounding (Earthing) for Dispatch Centers and Network Operator Positions” on page 5-62. • All 120 VAC receptacles shall have three conductors: phase, neutral, and ground (IEEE STD 1100- 1999). • Power cord plugs shall be supported with strain reliefs adequate to prevent accidental disconnection where applicable. Twist-lock plugs shall not be used in lieu of strain relief. • All communications equipment receptacles shall have the electrical box or cover plate permanently marked with the service panel and appropriate circuit identification. This identification shall be readily visible without requiring removal of the plug. 6-10 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES POWER QUALITY • Receptacles meant to serve loads other than communication equipment shall be fed from the main distribution panel board and not from the equipment panel or the UPS. See “Power Quality” on page 6-11 for additional information. • Outlet boxes or enclosures shall be securely mounted (NFPA 70-2005, Article 300.11 and 314.23). Cable ties shall not be used as a method of securing outlet boxes or receptacles. 6.2.11 RECEPTACLE STRIPS • Extension blocks or receptacle strips shall not be mounted on the floor. Damage can result from foot traffic or water, and water seepage or fire sprinkler activation may pose an electrocution hazard to personnel. • Receptacle strips are intended to provide AC power to low-power equipment where several linepowered items are closely collocated (such as an operator's position). In general, the following considerations need to be observed in selecting and installing receptacle strips: • If powering multiple similar devices from a receptacle strip, ensure that failure of the strip does not affect system availability. For example, do not plug all modems into the same receptacle strip. • Receptacle strips are limited to specific applications only where a receptacle strip is suitable for use. In all cases, receptacle strips shall be UL listed and of metal construction. • Receptacle strips shall be easily mountable without requiring disassembly. • AC power receptacle strips shall have a 3-prong power cord when used for permanent installations. • Receptacle strip shall be securely mounted to the supporting structure using intended bolt mounting and shall not be secured by being tie-wrapped. • Receptacle strips shall not include ON/OFF switches unless the ON/OFF switch is covered to help prevent the switches from being inadvertently switched off. • Consumer-grade surge-protected or locally fused receptacle strips shall not be used. Proper equipment setup and facility electrical design should accommodate these requirements. • No more than one receptacle strip shall be connected to the same branch circuit. • Redundant equipment pairs shall not be connected to the same receptacle strip. • Items considered individually critical (where no backup can easily be implemented) shall not be powered from a receptacle strip. • If multiple receptacle strips are used, they shall be plugged into dedicated simplex receptacles on individual branch circuits. 6.3 POWER QUALITY Power quality is defined as “the concept of powering and grounding electronic equipment in a manner that is suitable to the operation of that equipment and compatible with the premise wiring system and other connected equipment” (IEEE STD 1100-1999 and IEEE STD 1159-R2001). In order to operate reliably, electronic equipment shall be supplied with quality AC power. 68P81089E50-B 9/1/05 6-11
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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 225 and 226: 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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