TC (Tray Cable) is a multi-conductor cable designed for installation in cable trays, while TC-ER (Exposed Run) is a variant that allows short unsupported runs outside the tray.

Overview of TC Cable

Tray Cable (TC) is a factory-assembled, multi-conductor cable with two or more insulated conductors, optionally including a grounding conductor, all enclosed in a non-metallic jacket. TC cables are rated for 600 volts and are primarily used in industrial power, control, and instrumentation circuits. They are designed for installation in cable trays, raceways, and channels, and certain types can be used outdoors or for direct burial if specified . Key features of TC cables include:

• Flame-retardant insulation (PVC, XLPE, or EPR)
• UL listing for tray installation
• Mechanical protection against crush and impact
• Temperature ratings typically up to 90°C (194°F) and down to -40°C for cold environments TC cables are not permitted for unsupported runs between the tray and equipment unless specifically supported or protected according to NEC regulations .

TC-ER (Exposed Run) Cable

TC-ER builds upon standard TC cable with enhanced protection for short unsupported runs outside the tray, typically up to 6 feet (1.8 meters). This allows the cable to drop directly from the tray to equipment such as motors, drives, or control devices without additional conduit or support . Additional points about TC-ER:

• Complies with crush and impact requirements for exposed runs
• Can be used in industrial environments where continuous support is not feasible
• Provides flexibility and cost savings for final connections from tray to equipment

Applications

Both TC and TC-ER cables are widely used in:

• Industrial plants (petrochemical, steel, cement, mining)
• Commercial buildings and utility installations
• Automation and control systems where organized cable routing is required TC cables are ideal for protected tray installations, while TC-ER is preferred when a short exposed run is necessary between the tray and connected equipment .

Summary of Differences

In conclusion, TC cables provide a robust, tray-rated solution for industrial wiring, while TC-ER adds the flexibility for short exposed connections, making it suitable for final equipment terminations without additional conduit or support .