IEC 60317-56:2017 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. This second edition cancels and replaces the first edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - Clause 1: revision of the scope, reducing the number of grades of FIW from 3 through 9 to 4, 6 and 8 only; - Clause 1: revision of the scope, reducing the wire diameter range from (0,040 to 1,600) mm to (0,090 to 0,900) mm; - addition of an informative annex for abrasion resistance requirements for grades FIW 3 to 9. Keywords: insulated wires used for windings in electrical equipment, enamelled round copper wire, class 180