What types of cables are used in cable trays at the factory

The most common cables used in factory cable trays are TC (Tray Cable), TC-ER (Tray Cable with Exposed Run), ITC (Instrumentation Tray Cable), and PLTC (Power Limited Tray Cable), each designed for specific power, control, or signal applications.

Tray Cable (TC)

TC cables are multi-conductor cables rated for 600 volts, designed for power, control, and lighting circuits in industrial environments. They feature a non-metallic jacket over insulated conductors and may include grounding conductors. TC cables are UL listed and suitable for installation in cable trays, raceways, and outdoor locations when supported by a messenger wire. They are flame-retardant and can be used in Class 1, Division 2 hazardous locations .

Tray Cable with Exposed Run (TC-ER)

TC-ER cables are an enhanced version of TC cables, designed for short exposed runs of up to six feet between the tray and equipment. They include crush- and impact-resistant jacketing, allowing installation outside the tray without conduit in certain conditions. TC-ER cables are ideal for connecting motors, control panels, or other devices directly from the tray .

Instrumentation Tray Cable (ITC)

ITC cables are used for low-voltage control, signal, and communication circuits, typically not exceeding 150 volts and 5 amps. They are available in shielded or unshielded constructions, often with twisted pairs to reduce electrical noise. ITC cables are commonly used for PLCs, DCS systems, transmitters, and other instrumentation in industrial plants. Some ITC-ER variants allow short exposed runs similar to TC-ER .

Power Limited Tray Cable (PLTC)

PLTC cables are rated to 300 volts and are used for power-limited circuits, often in OEM applications or non-plenum, non-riser installations. They can be routed in the same tray as 600V power and control cables if separated by a divider. PLTC cables may also include shielding to reduce interference and are suitable for both indoor and outdoor installations when properly rated .

Construction and Features

• Insulation and Jacket: Tray cables are designed to withstand mechanical stress, moisture, oil, sunlight, and chemicals. Jackets may be thermoplastic or thermosetting, and some cables are armored for additional protection .
• Single-Core or Multi-Core: Depending on the application, cables can be single-core, multi-core, or multi-pair.
• Flame Retardancy: Most tray cables are UL listed for flame resistance and meet NEC requirements for industrial installations .
• Shielding: Some ITC and PLTC cables include shielding to reduce electromagnetic interference, especially for sensitive instrumentation circuits .

Summary

In a factory setting, TC and TC-ER cables are primarily used for power and control circuits, ITC cables for instrumentation and signal transmission, and PLTC cables for power-limited applications. All cables should be UL listed, tray-rated, and installed according to NEC guidelines to ensure safety, reliability, and compliance .