Describes requirements and dimensions for round copper wire covered with cotton, silk, rayon or paper. Braided coverings are excluded. Applicable to wires having following conductor diameters: cotton covered 0.150mm to 5.000mm, silk or rayon covered 0.040mm to 1.600mm and paper covered 0.250mm to 5.000mm. The following grades of covering are specified: for cotton four grades: single, fine and ordinary and double, fine and ordinary. For silk or rayon two grades: single and double. For paper covering two grades: grade 1 (fine) and grade 2 (ordinary).