THWN stands for Thermoplastic Heat and Water-resistant Nylon-coated. THHN stands for "Thermoplastic High Heat-resistant Nylon-coated".

THWN-THHN-2 wire is one of the most common single conductor wires used in the United States. Most wires in this category carry a dual rating and are marked and approved for both applications. They are rated for voltages up to 600 volts, and are approved for use in wet or dry locations up to 90°C (75°C when exposed to oil).

THWN-THHN-2 wire comes in standard AWG (American Wire Gauge) sizes from 14 AWG to 4/0AWG and larger sizes 250 MCM (thousands of circular mils) to 1000 MCM. Sizes 14, 12 and 10 AWG can be either solid or stranded conductors. Sizes 8 AWG and larger are stranded. THWN-THHN-2 wire comes in a variety of 10 standard colors.

Type THHN/THWN-2 building wire is intended for general-purpose applications as defined by the National Electrical Code (NEC). Type THHN/THWN-2 is permitted for new construction or rewiring for 600-volt applications. THHN wire is normally installed in conduit, and is used in residential and commercial applications.

All THWN-THHN-2 wire supplied by Electric Wire & Cable Specialists is Made in the USA, so you can be assured of receiving a fully tested and approved product made to the highest standard. We supply THHN-THWN-2 in many convenient lengths from 100 foot hand coils to 2500 foot reels and larger upon request.

Electric Wire & Cable Specialists is a full-line supplier of Electric and Electronic Wire & Cable and Accessories. We supply wire & cable in convenient lengths, and always pay the freight. We ship from a national network of distribution centers. Typically, your order arrives in 2-4 business days.