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Resumen del manual
2 Why Cable Tray? Safety .................................................................................................................... 3 Dependability ........................................................................................................... 4 Space Savings .......................................................................................................... 4 Cost Savings ......................................................................................................... 5-8 An In-depth Look at the 2002 NEC®, Section 392 Types of Cable Trays (NEC® 392.1 Scope)............................................................ 9-11 EMI/RFI Cable Tray ......................................................................................... 10-11 Cable Tray Materials ............................................................................................... 12 Types of Cables Allowed in Cable Tray [392.3 (A)]..................................................... 12 MI - Mineral Insulated Metal Sheathed Cable [Article 332] ............................... 12 MC - Metal Clad Cable [Article 330] .............................................................. 13 TC - Power and Control Tray Cable [Article 336] ........................................... 13 ITC - Instrumentation Tray Cable [Article 727] ............................................... 13 PLTC - Power Limited Tray Cable [Sections 725.61 (C) and 725.71 (E)] .......... 14 Other Types - Fire Alarm [Article 760], Multipurpose and Communications Cable [Article 800] ................14 Single Conductor & Type MV Cables [392.3 (B)] ....................................................... 14 Cable Tray Use in Hazardous Locations [392.3 (D)].............................................. 15-17 Limitations on Cable Tray Use [392.4] ..................................................................... 18 Cable Tray Loading [392.5 (A)]........................................................................... 18-20 Fiberglass Cable Tray [392.3 (E) & 392.5 (F)] ............................................................ 20 Discontinuous Cable Tray and Fittings [392.6 (A)] ................................................ 21-22 Covers [392.6 (D)]................................................................................................... 23 Barriers [392.6 (E) & (F)].......................................................................................... 24 Spacing of Multiple Cable Trays [392.6 (I)] ................................................................ 25 Supporting Conduit from Cable Tray [392.6 (J)] ........................................................ 25 Use of Cable Tray as an Equipment Grounding Conductor [392.7 Grounding] ........ 26-29 Fastening Cables [392.8 (B)] .................................................................................... 30 Cable Installation [392.8] ................................................................................... 30-32 Sizing Cable Tray Multiconductor - 2000 volts or less [392.9] ............................................... 32-34 Single conductor - 2000 volts or less [392.10]........................................... 34-36 Type MC or MV - 2001 volts or greater [392.12] ........................................... 37 Ampacities of Cables in Cable Tray .................................................................... 36-38 Cable Tray Wiring System Design and Installation Hints ....................................... 38-39 Fireproofing Tray ................................................................................................... 40 Expansion and Contraction ............................................................................... 41-42 Appendix Index & Appendix Sheets...................................................................... 44-55 Cable Tray Installation & Specification Checklists ........................................... 54-55 Footnotes ..................................................................................................................... 56 Cable Tray Manual Cooper B-Line, Inc1 INTRODUCTION The B-Line Cable Tray Manual was produced by B-Line's technical staff. B-Line has recognized the need for a complete cable tray reference source for electrical engineers and designers. The following pages address the 2002 National Electric Code® requirements for cable tray systems as well as design solutions from practical experience. The information has been organized for use as a reference guide for both those unfamiliar and those experienced with cable tray. Nearly every aspect of cable tray design and installation has been explored for the use of the reader. If a topic has not been covered sufficiently to answer a specific question or if additional information is desired, contact the engineering department at B-Line. We sincerely hope you will find the B-Line Cable Tray Manual a helpful and informative addition to your technica...