As one of the more affordable types of wiring for a home, THHN or THWN wire costs between $0.15 and $1.50 per foot on average. Also called thermoplastic, high heat-resistant nylon-coated (THHN ...

PROVIDE LARGER FEEDER WHERE INDICATED. S2. SCHEDULE IS BASED ON TYPE THHN/THWN FOR CONDUCTOR SIZES SMALLER THAN #3 AWG AND TYPE XHHW FOR CONDUCTOR SIZES #3 AWG AND LARGER. S3. PROVIDE 4 WIRE CIRCUIT ...