Southwire 500 Ft 14 AWG Stranded Brown THHN-THWN 600Volt Wire 22962558 New Roll 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 90C. Southwire's THHN conductors are primarily used in conduit and cable trays for services, feeders, and branch circuits in commercial or industrial applications Conductor is suitable for use in dry locations at temperatures not to exceed 90C Copper conductors are annealed (soft) copper, compressed strand, insulated with a tough heat and moisture resistant polyvinyl chloride (PVC)