USCA Stranded THHN/THWN 12 AWG Building Wire, 500 FT, Black,600&nbsp;Volt,&nbsp;90C American Brand , UL listed Closer adherenceof NylonjackettoPVCinsulationduetoproprietary coextrusiontechnology (in publicity status) Fire-resistant level: VW-1 Increased heat resistance property of wire,especially in and overheated state of instantaneous hot deformation; Good chemical stability, oil & gasoline resistance, hydrocarbons resistance etc