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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 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
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Cable Tray Manual Cooper B-Line, Inc