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, resistance to abrasion, solderability, resistance to solvents and high temperature failure. BS AMD 8891 RENUMBERS THIS STANDARD TO BS EN 60317 PT7