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TC-ER is a type of tray cable that bears a special “Exposed Run” (ER) rating, deeming the cable suitable for use as open wiring that is not installed in tray, conduit, or other raceway. TC-ER is often a cost-effective alternative to standard TC cable because it reduces or eliminates the need of conduit installation. With ample support and protection, TC-ER rated cable is able to make exposed runs of up to 50 feet, as opposed to standard TC rated cable which can only extend 6 feet outside of the tray. TC-ER is most commonly used when long runs between trays or from tray to electrical device is required.

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