Specifies the requirements of enamelled round copper winding wire of class 220 with a sole coating based on polyimide resin. Covers the following range of nominal conductor diameters: 0,020 mm up to and including 2,000 mm (Grade 1); 0,020 mm up to and including 5,000 mm (Grade 2). Coverage includes dimensions, electrical resistance, heat shock, break down voltage, loss of mass, and high temperature failure.