Question: what does thwn 2 stand for?
Answer: THWN stands for Thermoplastic Heat and Water-resistant Nylon-coated. THHN stands for "Thermoplastic High Heat-resistant Nylon-coated". ... 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).