North American Cable Types
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S = Service Grade (also means extra hard service when not followed by J, V, or P) J = Hard Service V = Vacuum cleaner cord (also light duty cable) P = Parallel cord (also known as zip cord)—Always light duty E = Thermoplastic Elastomer (UL/NEC designation ONLY) O = Oil Resistant* T = Thermoplastic W = Outdoor—includes sunlight resistant jacket and wet location rated conductors (formerly "W-A") H = Heater cable VW-1 = Flame retardant FT2 = Flame retardant * When only one "O" appears in a classification (i.e. SJEOW), only the outer jacket material is oil resistant. If two "O's" are in the classification (i.e. SEOOW), the insulation covering the conductors and the outer jacket insulation are all oil resistant. | |||
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SJT—Junior hard service, thermoplastic-insulated conductors and jacket. SJTO—Same as SJT, but oil-resistant thermoplastic outer jacket. SJTOO- Same as SJTO but conductor insulation and jacket BOTH oil resistant. SJTOW—Same as SJTO except weather-resistant rated. SJTOOW- Same as SJTOW but conductor insulation and jacket BOTH oil resistant SJTW—Hard-usage thermoplastic or rubber-insulated conductors and overall thermoplastic jacket; weather-resistant for outdoor use. SVT—Thermoplastic-insulated vacuum cleaner cord, with or without third conductor for grounding purposes. SVTO- Same as SVT but oil-resistant thermoplastic outer jacket SVTOO- Same as SVTO but conductor insulation and jacket BOTH oil resistant SPT-2—Parallel jacketed thermoplastic cable with heavier construction than SPT-1. ST—Hard service cord with all thermoplastic construction. STO—Same as ST, but with oil-resistant thermoplastic outer jacket. STOO- Same as STO but conductor insulation and jacket BOTH oil resistant STOW—Same as STO, but weather-resistant rated. STOOW- Same as STOW but conductor insulation and jacket BOTH oil resistant
NOTICE: Definitions of cable designations are derived from UL’s designation scheme as defined in the National Electrical Code (NEC)—NFPA-7
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