4/0-AWG Aluminum THHN building wire has 7-mil white nylon jacket to withstand harsh environmental conditions. The 50-mil thick thermoplastic insulation resists electrical leakage and offers protection against environmental threats. This wire has current rating of 150-Amps at 60 deg C, 180-Amps at 75 deg C, 205-Amps at 90 deg C and voltage rating of 600-Volts. It withstands dry temperature rating of 90 deg C and wet temperature rating of 75 deg C. This 589-mil OD wire of length 1000-ft comes in a reel. It is ideal to use in wet or dry locations. This wire is suitable for feeders and branch-circuits in commercial as well as industrial applications. Building wire is UL 83 listed, CSA certified and meets ASTM B800/B801, A-A-59544, NEMA WC70, NFPA 70 standards.