This International Standard specifies the requirements of enamelled round aluminium winding wire of class 105 with a sole coating based on polyvinyl acetal resin, which may be modified provided it remains the chemical identity of the original resin and meets all specified wire requirements. Class 105 is a thermal class that requires a minimum temperature index of 105 and a heat shock temperature of at least 155 °C. The range of nominal conductor diameters covered by this standard is: - Grade 1: 0,040 mm up to and including 1,600 mm; - Grade 2: 0,040 mm up to and including 5,000 mm.