what does thhn mean in electrical
Types. THHN wires come in two basic formats -- stranded and solid core. As a stranded cable, THHN is available in sizes from 14 awg to 750 kcmiL, and as a solid cable in sizes 14 to 10 awg.It is generally manufactured in copper or aluminum.ave. Window framed with wires & tube image by diter from Fotolia.com. THHN stands for thermoplastic high heat-resistant nylon coated. This is a type of insulated electrical wire suitable for a variety of low-to mid-voltage applications and can safely handle a load of up to 600 volts.