Type TC (Tray Cable) and other UL-listed tray-rated cables are the standard choice for installation in T-shaped cable trays.

Recommended Cable Types

Type TC (Tray Cable) is the most commonly used cable for power and control circuits in cable trays. It consists of two or more insulated conductors under a non-metallic jacket, rated for 600 volts, and is suitable for industrial, commercial, and utility installations. TC cables are UL-listed and comply with NEC Article 336, making them appropriate for open tray installations, including T-shaped trays . Type TC-ER (Tray Cable – Exposure Rated) is a variant of TC cable designed to leave the tray for short distances (up to six feet) without additional support, provided it is secured and protected from physical damage. This is useful for transitions between the tray and equipment . Instrumentation Tray Cable (ITC) is used for instrumentation and control applications. These cables may be shielded or unshielded and are suitable for smaller multi-conductor runs in T-shaped trays, especially when precise signal integrity is required .

Installation Considerations

• Tray Compatibility: Ensure the cable is rated for tray installation and meets the NEC Section 392.10(A) requirements.
• Voltage and Environment: Select cables based on voltage class, environmental exposure, and whether flame retardant or crush-resistant properties are needed .
• Cable Support: Cables must be secured at intervals specified by the manufacturer, typically not exceeding six feet for TC-ER cables .
• Bend Radius: Maintain the minimum bend radius when routing cables through T-shaped trays to prevent damage .
• Cable Fill: Avoid overfilling the tray to ensure proper heat dissipation and maintain ampacity .

Summary

For a T-shaped cable tray, UL-listed tray-rated cables such as Type TC, TC-ER, or ITC are recommended. These cables provide the necessary insulation, mechanical protection, and compliance with NEC standards, ensuring safe and reliable operation in industrial and commercial environments . Proper installation, securing, and adherence to bend radius and fill limits are essential for optimal performance.