This part of IEC 60317 specifies the requirements of solderable fully insulated FIW zero-defect enamelled round copper wire, class 180, with a single coating based on polyurethane resin, which may be modified providing it retains its chemical identity and satisfies all the required technical specifications. The range of nominal conductor diameters of the wires covered by this standard is as follows: Grade of FIW 4, 6, 8: 0,090 mm up to and including 0,900 mm Nominal conductor diameters are specified in IEC 60317-0-7:2012.