Describes the dimensional tolerances and requirements for the covering of copper conductors of rectangular section, with two or more layers of paper. Intended for winding coils for oil-immersed transformers. Applicable to conductors having thicknesses between 0.8 mm and 5.6 mm and widths between 2.00 mm and 22.4 mm. Covers definitions, general requirements and test conditions, conductor, paper, application of paper, increase in dimensions due to the covering, packaging, measurement of conductor dimensions and overall dimensions and five tables.