This part of IEC 60317 specifies the requirements of enamelled round copper winding wires of class 200 with a sole coating based on polyesterimide 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.

The range of nominal conductor diameters covered by this document is as follows:
- Grade 1: 0,018 mm up to and including 3,150 mm;
- Grade 2: 0,020 mm up to and including 5,000 mm;
- Grade 3: 0,0250 mm up to and including 1,600 mm.

The nominal conductor diameters are specified in Clause 4 of IEC 60317-0-1:2013.