This Part of IEC 60317 specifies the general requirements of enamelled round copper winding
wires of class 105 with a sole coating based on polyvinyl acetal resin, which may be modified
providing it retains the chemical identity of the original resin and meets all specified wire
requirements.
NOTE A modified resin is a resin that has undergone a chemical change, or contains one or more additives to
enhance certain performance or application characteristics.
Class 105 is a thermal class that requires a minimum temperature index of 105 and a heat
shock temperature of at least 155 °C