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From the Manufacturer 14-Gauge, Stranded Copper Single Conductor, Thermoplastic High Heat and Moisture Resistant PVC Insulation, Abrasion, Moisture, Gasoline, and Oil Resistant Nylon Sheath/Jacket THHN, 600-Volt, also rated MTW and THWN-2. Southwire THHN or THWN-2 or MTW copper conductors are annealed soft copper, unilay compressed strand, insulated with a tough heat and moisture resistant polyvinyl chloride PVC, over which a nylon polyamide or UL Recognized equal jacket is applied.THWN sizes 14-10 AWG. THWN-2 sizes 8 AWG and larger. Southwire THHN or THWN-2 conductors are primarily used in conduit and cable trays for services, feeders, and branch circuits in commercial or industrial applications as specified in the National Electrical Code. When used as Type THHN, or T90 Nylon conductor is suitable for use in dry locations at temperatures not to exceed 90-Degree C. When used as Type THWN-2 or TWN75, conductor is suitable for use in wet or dry locations at temperatures not to exceed 90-Degree C or not to exceed 75 -Degree C when exposed to oil. When used as Type MTW, conductor is suitable for use in wet locations or when exposed to oil at temperatures not to exceed 60-Degree C or dry locations at temperatures not to exceed 90-Degree C with ampacity limited to that for 75-Degree C conductor temperature per NFPA 79. Conductor temperatures not to exceed 105-Degree C in dry locations when rated AWM and used as appliance wiring material or when used asT90 Nylon.-Voltage for all applications is 600-Volt. Southwire Type THHN or THWN-2 or MTW also AWM meets or exceeds all applicable ASTM specifications, UL Standard 83, UL Standard 1063 MTW, Federal Specification A-A-59544, and requirements of the National Electrical Code. No matter what the residential, commercial, or industrial application requires, you need look no farther. Southwire has just the right wire and cable product you're looking for.