IEC 60317-40:2015 specifies the requirements of glass-fibre braided impregnated, bare, grade 1 or grade 2 enamelled rectangular copper winding wire, temperature index 200. This second edition cancels and replaces the first edition published in 1992, Amendment 1:1997 and Amendment 2:2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - revision to Clause 2, Normative references; - new 3.2.2 containing general notes on winding wire, formerly a part of the scope; - revision to references to IEC 60317-0-5 to clarify that its application is normative. Keywords: glass-fibre braided impregnated, bare, grade 1 or grade 2 enamelled rectangular copper winding wire, temperature index 200, insulated wires used for windings