Cable trays containing conductors operating over 600 volts shall have a permanent, legible warning notice carrying the wording “DANGER — HIGH VOLTAGE — KEEP AWAY” placed in a readily visible position on all cable trays, with the spacing of warning notices not to exceed 3 m (10 ft). It is quite common to see cable trays used to carry DC PV source circuits operating over 600 volts. In the 2017 NEC ®, cable. Type TC – Tray Cable – (NEC Article 336) –Power and control tray cable type TC is a factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a non-metallic jacket. TC cables are rated for 600 volts and can be used in industrial. “TC” means Tray Cable, listed under UL 1277. “ER” (Exposed Run) means it meets UL's crush and impact tests and can legally run up to 6 feet outside the tray—without conduit. “JP” (Jacketed Power) is a manufacturing term indicating this is a multiconductor jacketed cable, as opposed to paired or. This Wire Wisdom addresses some of the most frequently asked questions regarding a supplemental rating for type TC, ITC and PLTC tray cables —the ER rating for cables used in exposed or extended runs. The “-ER” suffix stands for “Exposed Run. ” The rating was created for type “TC” tray cables, type “ITC” instrumentation tray cables, and. Triala, manufacture Electrical identification Labels for Cable Trays, Trunking, Raceways, and Conduits are essential for ensuring safety and efficiency in electrical management.