Cable Tray

Topics: Electrical wiring, Cable, Cable tray Pages: 102 (30171 words) Published: January 3, 2013
CT05MAN

CABLE TRAY MANUAL
Based on the 2005 National Electrical Code®

2005

Table of Contents
Page No.

Introduction ...................................................................................................................... 2 Why Cable Tray? Safety .................................................................................................................... 3 Dependability ........................................................................................................... 4 Space Savings .......................................................................................................... 4 Cost Savings ......................................................................................................... 5-8

An In-depth Look at the 2005 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...
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