IEC 60317-21 pdf download Specifications for particular types of winding wires – Part 21 : Solderable polyurethane enamelled round copper wire overcoated with polyamide, class 1 55 1 Scope This International Standard specifies the requirements of solderable enamelled round copperwinding wire of class 155 with a dual coating. The underlying coating is based onpolyurethane resin，which may be modified providing it...