what does thhn in electrical stand for
Difference Between THHN Wire and THWN wire | THHN vs. THWN Wire THHN Wire vs. THWN wire THHN stands for Thermoplastic High Heat-Resistant Nylon coated. It is the most popular wire for use in construction but can also be used to wire control circuits, machine tools and certain electrical appliances. THWN stands for Thermoplastic Heat and Water resistant Nylon coated.