Abstract: An insulated electrical wire coated with a polyamide-imide insulating material which is a copolymer of anhydrotrimellitic acid, aliphatic and aromatic dicarboxylic acids and a diisocyanate, with a molar ratio of the acids to the diisocyanate of from about 0.9:1.0 to about 1.1:1.0 and optionally further containing from about 1 part wt. to about 30 parts wt. of an epoxy resin per each 100 parts of the copolymer. Optionally the aforementioned insulation can be an interior, first coating, coated by a second coating of a polyamide, polyamide-imide, and when the first coat does not contain an epoxy, then a polyimide.