Copper THHN/THWN-2 conductors are primarily used in conduit and cable trays, when approved, for services, feeders and branch circuits in commercial or industrial applications as specified in the National Electric Code. THHN applications are suitable for use in dry locations only at temperatures not to exceed 90°C. THHN-2 applications are suitable for use in either wet or dry applications, with temperatures that do not exceed 90°C.There are specifications that flexible thhn wire、thhn wire 1/0、thhn 2、thhn wire 30mm2、thhn/thwn/thwn-2、thhn awg 4 wire etc.
Either solid or stranded soft drawn copper, per ASTM Standards
Heat and moisture resistant colored polyvinyl chloride (PVC) insulation, with a clear nylon (polyamide) or UL-listed equal jacket, which provides abrasion resistance
UL 83
PNS35-1