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Cable tray wires and cables

Cable tray wires and cables

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Cable trays typically carry power, control, instrumentation, and communication cables, including TC (Tray Cable) and ITC (Instrumentation Tray Cable) types.

Types of Cables in Cable Trays

Cable trays are designed to support a variety of insulated electrical cables used for power distribution, control, and communication in commercial and industrial settings . The most common types of cables include:

  • Type TC (Tray Cable): These are factory-assembled cables with two or more insulated conductors, optionally including bare or covered grounding conductors, under a non-metallic jacket. TC cables are rated for 600 volts and are suitable for industrial power or control circuits. They can be installed in cable trays, raceways, and outdoor locations when supported by a messenger wire. TC cables may also be used in hazardous locations if UL-listed for such applications .
  • Type ITC (Instrumentation Tray Cable): These cables are used for instrumentation and control circuits, available in shielded or unshielded constructions with multiple single conductors or twisted pairs. They have a 300-volt insulation rating and are suitable for Class 2 and Class 3 circuits. ITC cables are often used for signal transmission and monitoring systems .
  • Communication and Data Cables: Low-voltage cables for telecommunication, networking, and data transmission are also commonly routed in cable trays. These may include fiber optic cables, twisted pair cables, and other structured cabling systems .

Installation Considerations

  • Cables must be secured at intervals (typically not exceeding six feet for TC cables) to prevent sagging or damage .
  • Cable trays can accommodate large power cables with support blocks to maintain spacing and prevent overheating, as well as smaller control or communication cables secured with cable ties .
  • The National Electrical Code (NEC) Section 392 governs the types of cables allowed in trays, installation methods, and fill capacity to ensure safety and compliance .

Summary

In essence, a cable tray can include power cables (TC), control and instrumentation cables (ITC), and communication/data cables, all organized to provide protection, accessibility, and proper support. The choice of cable depends on voltage rating, shielding requirements, and the specific application within the facility .

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