standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION SUSPENDED CEILING CAVITY SUSPENDED CEILING CAVITY FIGURE 9-7 COMMUNICATIONS CABLES IN SUSPENDED CEILINGS 9.9.4 AC POWER CABLING WARNING Facility AC wiring within junction boxes, receptacles, and switches shall be performed by a licensed and bonded electrical contractor. Personnel safety and liability hazards can result from AC wiring performed by installation personnel other than an electrical contractor. 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. 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. WARNING PERMITTED NOT PERMITTED SIGNAL OR TELEPHONE CABLES SIGNAL OR TELEPHONE CABLES Under no circumstances shall consumer-grade power outlet strips be used in any installation. Extension cords of any type shall not be used for connecting line power to communications equipment. 9-16 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT CABLING 9.9.5 DC POWER CABLING In telecommunications environments, common DC systems are as follows: • +12 volt systems • +24 volt systems • -24 volt systems • -48 volt systems Traditional wireline telephone offices most often use -48V, sometimes called -BATT voltage, whereas many cellular, PCS, and other radio systems use +24 to 27 V. There are also instances of -24V systems. In U. S. installations, the most common practice is to use red cabling for the sourcing, fused, ungrounded, “hot” terminal. Black cabling is used for the return, unfused, grounded, terminal. (European installation practice uses blue insulation for the “hot” lead.) Chapter 8, “Power Sources,” discusses power cabling sizing and other installation concerns. The manual for the equipment being installed will also have specifications stating the cabling size required. Careful consideration must be given to cable size and length. See Chapter 6, “Power Sources” and cabling capacity for further information. FRONT VIEW SIDE VIEW FIGURE 9-8 CABLE MANAGEMENT SYSTEM WITH INTEGRATED RACK GROUND BUS BAR 68P81089E50-B 9/1/05 9-17
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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT CABLING<br />
9.9.5 DC POWER CABLING<br />
In tele<strong>communication</strong>s environments, common DC systems are as follows:<br />
• +12 volt systems<br />
• +24 volt systems<br />
• -24 volt systems<br />
• -48 volt systems<br />
Traditional wireline telephone offices most often use -48V, sometimes called -BATT voltage, whereas<br />
many cellular, PCS, <strong>and</strong> other radio systems use +24 to 27 V. There are also instances of -24V systems.<br />
In U. S. installations, the most common practice is to use red cabling <strong>for</strong> the sourcing, fused,<br />
ungrounded, “hot” terminal. Black cabling is used <strong>for</strong> the return, unfused, grounded, terminal.<br />
(European installation practice uses blue insulation <strong>for</strong> the “hot” lead.) Chapter 8, “Power Sources,”<br />
discusses power cabling sizing <strong>and</strong> other installation concerns. The manual <strong>for</strong> the equipment being<br />
installed will also have specifications stating the cabling size required. Careful consideration must be<br />
given to cable size <strong>and</strong> length. See Chapter 6, “Power Sources” <strong>and</strong> cabling capacity <strong>for</strong> further<br />
in<strong>for</strong>mation.<br />
FRONT VIEW SIDE VIEW<br />
FIGURE 9-8 CABLE MANAGEMENT SYSTEM WITH INTEGRATED RACK GROUND BUS BAR<br />
68P81089E50-B 9/1/05 9-17
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