Southwire's THHN and THWN is a multi-purpose building wire used in conduit and cable trays for service, feeders and branch circuits in commercial and industrial applications. It is also used as a conductor in NM-B, UF-B, SER, SEU and MC. Southwire's THHN is rated for 600-Volt and has a heat capacity of up to 90°C.
Southwire type 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 Electric Code
When used as a type THHN conductor it is suitable for use in dry locations that are not to exceed temperatures of 90ºC
THHN copper conductors are annealed (soft) copper
