This International Standard specifies the requirements of enamelled rectan- gular copper winding wire of class 155 with a sole coating based on polyes- ter resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. Class 155 is a thermal class that requires a minimum temperature index of 155 and a heat shock temperature of at least 175 °C. The range of nominal conductor dimensions covered by this standard is: - width: min 2,0 mm, max 16,0 mm; - thickness: min 0,80 mm, max 5,6 mm.