Application Type THHN – THWN wires are designed to operate at conductor temperatures of 75 deg. C for 600 volts service in wet and dry locations. Applicable for both new work and rewiring installations where the smaller wire diameter permits additional circuits or larger conductors to be installed in the conduit without exceeding maximum fill limitations. Type THHN – THWN wires are also recommended for industrial installation where exceptional resistance to heat and corrosive atmospheres are needed, such as chemical paints, oil refineries, paper mills, etc. (B) Technical Data Conductor: Soft drawn annealed copper conductors as per UL 83. Available in solid or stranded Insulation: Extruded Polyvinyl Chloride (PVC) compound rated 75 and 90 deg. C. Maximum conductor temperature: 70 o C during operation. Jacket: Tough, smooth, heat and light stabilized, low moisture absorption nylon As per UL-1063 and UL-83 Color code: Any colors are available to order. Packing condition: 100 Yard on plastic spool.