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EQUIPMENT CABLING CHAPTER 9: EQUIPMENT INSTALLATION 9.9.3 CABLING REQUIREMENTS FOR CABLE TRAYS OR LADDERS 9.9.3.1 CABLE INSTALLATION WITHIN CABLE TRAYS OR LADDERS • Cables that span a horizontal gap greater than 610 mm (2 ft.) shall be supported. • When installing cables into a cable tray system, cables shall not be pulled with such force that the conductor insulation or cable jacket integrity is destroyed or that the cable is deformed. • Antenna and transmission lines minimum bending radii shall be considered when placing these cables within the cable tray. Follow manufacturers’ specifications. • Cables installed within a cable tray system shall be fastened securely to transverse members in all horizontal and vertical runs every 914 mm (36 in.). • The most desirable method to exit the cable runway is to drop out the bottom into a rack/cabinet or a vertical support such that physical separation is maintained. • AC power cables shall not be run within a cable runway system unless they are enclosed within metallic conduit or raceway. NOTE: Raceways or conduit installed below or along side cable runways may not be supported by the cable runways themselves unless the cable runway system is designed to provide such support. 9.9.3.2 CABLE SEPARATION AND GROUPING WITHIN CABLE TRAYS • Cable groups shall be separated a minimum of 50.8 mm (2 in.) from other cable groups. (See ANSI/TIA/EIA-568(b) and 569(b); NFPA 70-2005, Articles 800-133, 800-18, and 820-133 for additional information.) • Transmission lines (coax) for transmitting stations shall be separated a minimum of 101 mm (4 in.) from electrical lights, power, and signaling circuits (NFPA 70-2005, Article 810.70). • Groups are defined as: • AC power, DC Power, ground conductor and RF transmission cabling • Data, control, signal and timing reference cabling • Telephone cabling • At a minimum the above group separation must be maintained. However with adequate cable tray space, logical sub-groups are permitted such as, bundles of DC cabling, bundles of RF cabling, etc. • AC power cables cannot be run in the same cable tray as CAT-5 or communications cables unless separated by a barrier as defined by NFPA 70-2005. (See “Computer Network Cabling” on page 9-18 for additional information.) 9-14 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES EQUIPMENT CABLING GROUND (EARTH) RF TRANSMISSION DC POWER LOW VOLTAGE/ DATA/SIGNAL CABLE TRAY NOTES: 1. Each cable type may be single or multiple cables of the same type grouped together. 2. If the ground conductor is installed on the outside of the rack, coaxial RF transmitting cable shall be 10 cm (4 in.) away from any other cables (power and low voltage) as described in NFPA 70-2005, Article 810.70. Receiving coaxial RF cables require a 5 cm (2 in.) separation. FIGURE 9-6 MINIMUM CABLE GROUP SEPARATION IN CABLE TRAY 9.9.3.3 SECURING CABLES WITHIN CABLE TRAYS 5 CM (2 IN.) MINIMUM 10 CM (4 IN.) SEE NOTE 2 5 CM (2 IN.) MINIMUM • Cables and conductors shall be secured at intervals of no more than 914 mm (3 ft.). • Nonmetallic cable ties shall be used to secure cables and conductors. Attachment shall be tight enough to secure cable, yet not crushing or deforming the cable. • Cables running vertically on a cable ladder shall be secured at a minimum of 914 mm (36 in.). It is preferable to secure them at every rung, but not required. • When cables span a gap (such as between a cable tray and a ladder) in excess of 610 mm (24 in.), the cables shall be supported. • Certain telephony requirements may exist for cables to be laced. See “Cabling in Telephone Wiring Environments” on page 9-28 for additional information. • Cable shall be sized to length including a sufficient service loop. Excess cable shall not be coiled on top of cabinets or cable trays. • Communications cables shall not be attached by any means to the exterior of a conduit or other raceway as a means of support (NFPA 70-2005, Articles 725.58 and 800.133(C)). • Communications cables shall not be laid directly on the tiles or grid work of a false ceiling (ANSI/ TIA/EIA-569(b)), NFPA 70-2005, Article 725.7, 800.21, and 820.21). 68P81089E50-B 9/1/05 9-15
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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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CHAPTER 7 SURGE PROTECTIVE DEVICES
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Page 335 and 336: STANDARDS AND GUIDELINES FOR COMMUN
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Page 405 and 406: APPENDIX A ELECTROMAGNETIC ENERGY I
Page 433 and 434: 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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