Power & Control Tray Cable (Type TC)

Type TC is a rugged multiconductor cable built for the cable-tray systems that thread through factories, refineries and power plants. It bundles power, control and instrumentation conductors under a flame-retardant jacket and is designed to be supported by tray rather than pulled through conduit.

Its rules track where it may go: in tray, in raceway, or supported outdoors between structures under specific conditions. Variants like TC-ER add exposed-run and crush ratings so limited lengths can leave the tray. The article keeps TC out of applications where it would be exposed to damage it wasn't built to take.

When it applies

Type TC is a multiconductor cable built to lay in cable tray, carrying power, control, and signal circuits through industrial plants. It is the workhorse where you have long tray runs feeding motors, instrumentation, and control panels and you want a rugged, jacketed cable rather than pulling everything in conduit.

Common mistakes

• Using TC outside its permitted support and location rules, like unsupported spans it is not rated for.
• Leaving cable exposed to physical damage where it needs additional protection.
• Ignoring the marked temperature and wet-location ratings when routing it.

In the field

In a plant I keep TC supported per its listing and protected wherever it leaves the tray. It is durable cable, but the rules on where and how it can run without a raceway are exactly where inspectors focus.