This part of IEC 60317 specifies the requirements of enamelled round aluminium winding wire of class 200 with a dual coating. The underlying coating is based on polyester or polyesterimide resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. The superimposed coating is based on polyamide-imide resin. 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 standard is: Grade 1: 0,400 mm up to and including 3,150 mm; Grade 2: 0,400 mm up to and including 5,000 mm. The nominal conductor diameters are specified in clause 4 of IEC 60317-0-3:2008.