Building wire is the most frequently specified wiring solution today for commercial and residential construction projects.
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Type TFFN may be used as fixture wire, machine tool wiring, or appliance wiring material as specified in the National Electrical Code®2. Type TFFN, conductor is suitable for use at temperatures not to exceed 90°C.
THHN stands for Thermoplastic High Heat-resistant Nylon coated. THHN can come in stranded or solid conductors depending on the size. It is either manufactured in copper or aluminum and covered in a PVC (polyvinyl chloride) insulation with a nylon jacket. THHN is UL listed with a rated 90 degrees Celsius in dry locations or 75 degrees Celsius in wet applications with a THWN rating. THHN building wire may also be used for wiring of machine tools, control circuits or on certain appliances.