Type THHN wire is intended for general purpose applications such as conduit or cable tray, services, feeders, and branch circuits. These 600V-rated conductors are suitable for wet or dry locations at temperatures not to exceed 90 degrees Celsius (or 75 degrees C in oil or coolants). Sizes from 14 to 4 AWG are available in a range of colors.
Type THHN building wire is intended for general purpose applications as defined by the National Electrical Code (NEC). It is appropriate for new construction or rewiring for 600 volt applications. When used as type THHN, the conductor is suitable for use in wet or dry locations at temperatures not to exceed 90°C or not to exceed 75°C in oil or coolants. When used as type MTW, the conductor is suitable for use in dry locations at 90°C, or not to exceed 60°C in wet locations or where exposed to oils or coolants.
Insulation Type THHN Wire starts at