What type of cable is placed in a trapezoidal cable tray

Tray cables (TC, TC-ER, ITC, PLTC) are the primary types of cables installed in trapezoidal cable trays, designed for power, control, and instrumentation applications.

Overview of Tray Cables

Trapezoidal cable trays are commonly used in industrial and commercial settings to organize and support multiple cables. The cables placed in these trays must be UL-listed and tray-rated, capable of withstanding mechanical stress, exposure to moisture, sunlight, chemicals, and heat, without requiring additional conduit protection .

Common Types of Tray Cables

1. TC (Tray Cable) – General-purpose multi-conductor cables suitable for power, control, and lighting circuits. Rated for 600 volts, TC cables are flame-retardant and can be installed in cable trays, raceways, and outdoor locations when supported .

2. TC-ER (Tray Cable – Exposed Run) – Similar to TC but designed for short exposed runs (up to 6 feet) between the tray and equipment. These cables feature crush- and impact-resistant jackets, allowing installation outside the tray for limited distances without conduit .

3. ITC (Instrumentation Tray Cable) – Used for low-voltage control, signal, and communication circuits (typically ≤150 volts and 5 amps). ITC cables are often shielded to reduce interference and are suitable for PLCs, DCS systems, and instrumentation applications .

4. PLTC (Power-Limited Tray Cable) – Rated for Class 2 and Class 3 circuits, commonly used in alarm systems, intercoms, security, and building automation. PLTC cables can share trays with higher-voltage cables if separated by dividers .

Key Considerations

• Voltage Rating: Ensure the cable matches the system voltage (300V or 600V).
• Environmental Resistance: Cables must resist heat, moisture, sunlight, and chemicals.
• Mechanical Protection: Crush- and impact-resistant jackets are essential, especially for exposed runs.
• Compliance: All cables must meet NEC Article 336 (TC), 725 (ITC/PLTC), and UL standards for tray installation .
• Installation Practices: Cables should be neatly routed, supported, and separated according to type and voltage to prevent interference and maintain safety .

In summary, trapezoidal cable trays typically house TC, TC-ER, ITC, or PLTC cables, selected based on voltage, application, and environmental conditions, ensuring compliance with NEC and UL standards for safe and reliable operation.