Type THHN/THWN-2 building wire is intended for general purpose applications as defined by the National Electrical Code (NEC). Type THHN-THWN-2 is permitted for new construction or rewiring for 600-volt applications. Applications requiring Type THHN or THWN-2, the conductor is appropriate for use in wet or dry locations at temperatures not to exceed 90°C or not to exceed 75°C in oil or coolants. Applications requiring Type MTW conductor is appropriate for use in dry locations at 90°C, or not to exceed 60°C in wet locations or where exposed to oils or coolants. Applications requiring Type AWM conductor is appropriate for use at temperatures to not exceed 105°C in dry locations. Commercial electrical wire for outlets, switches, etc. THHN electrical wire can be used in wet or dry locations Used in conduit, cable trays, branch circuits, and appliance wiring Color coded, heat and moisture resistant PVC insulation Stranded copper conductor with PVC insulation and nylon jacket Copper conductors are annealed soft copper Up to 40 amps Nylon jacket Rated for 600-Volt maximum Up to 90°C (194°F) UL Listed