UL 1278

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These requirements cover electrical power and control cables consisting of either two or more current-carrying copper, aluminum, or copper-clad aluminum circuit conductors, or one or more pairs of thermocouple-extension wires. Thermocouple-extension wires and circuit conductors shall not be mixed in the same cable. These cables are constructed with or without either or both:
1.One bare or one or more insulated grounding conductor(s), and
2.One or more individually jacketed optical-fiber members, all under an overall jacket.

These electrical and hybrid electrical/optical-fiber cables are intended for use (optical and electrical functions associated in the case of a hybrid cable) in accordance with Article 340 and other applicable parts of the National Electrical Code (NEC) in cable trays, in raceways, and where supported in outdoor locations by a messenger wire.

The conductors in these cables have 600-V thermoplastic insulation accepted in this application for 200C (392F) on Nos. 18 - 2 AWG conductors; 600-V thermoplastic insulation accepted in this application for 150C (302F) on Nos. 18 - 4/0 AWG conductors; 2000-V thermoset insulation accepted in this application for 90C (194F) or 75C (167F) on Nos. 14 - 4/0 AWG and 250 - 1000 kcmil conductors; 600-V thermoset insulation accepted in this application for 125C (257F) on Nos. 14 - 4/0 AWG and 250 - 1000 kcmil conductors; or 600-V thermoset or thermoplastic insulation accepted in this application for 90C (194F), 75C (167F), or 60C (140F) on Nos. 14 - 4/0 AWG and 250 - 1000 kcmil conductors. Cables are surface marked with the conductor type letters and/or with the temperature and "wet", "dry", or "wet or dry" ratings applicable to the insulation. Cables for direct burial are so marked on the surface. Cables that have a sunlight-resistant jacket are surface marked "sun res" or "sunlight resistant". Cables with 600-V conductors may include one or more optical-fiber member(s) and are surface marked to so indicate. Cables that are surface marked "oil resistant II" have a jacket that is for exposure to mineral oil at temperatures not in excess of 75C (167F). Cables that are surface marked "oil resistant I" have a jacket that is for exposure to mineral oil at temperatures not in excess of 60?C (140F). Each insulated conductor that is oil resistant II, oil resistant I, VW-1, gasoline-resistant, reagent-resistant, or has another individual conductor use is individually so marked.