The enamelled resistance wires are coated with a dual coat modified polyester enamel system which combines the excellent physical and electrical properties of a modified polyester base coat with the added chemical resistance, surface toughness, smoothness and high thermal rating of a polyamide-imide polymer topcoat. The combination of these two high quality resins produces a coating that has outstanding abrasion resistance, flexibility, chemical resistance, burnout and thermal shock resistance and dielectric strength. These properties, coupled with careful selection and processing of the resistance wire, produces an enamelled wire which meets the exacting requirements of the automotive and electrofusion industry.