THHN Thermoplastic High Heat na-eguzogide waya na-ekpuchi mkpuchi naịlọn bụ otu onye na-eduzi waya nwere mkpuchi PVC na jaket nylon. THWN thermoplastic okpomọkụ- na waya na-eguzogide mmiri bụ otu ihe ahụ dị ka THHN na a na-ejikarị ha abụọ eme ihe. THWN bụkwa otu waya na-eduzi nwere mkpuchi PVC na jaket nylon. Waya THWN-2 bụ waya THWN nwere nchebe ọkụ ma enwere ike iji ya na ọnọdụ okpomọkụ dị elu (ruo 90 Celsius ma ọ bụ 194 ° F).