1.1 This specification covers bare round copper-clad steel wire for electronic application. 1.2 Four classes of copper-clad steel wire are covered as follows: 1.2.1 This specification covers bare round copper-clad steel wire for electronic application. Four classes of copper-clad steel wire are covered as Class 30HS, 30A, 40HS, and 40A. The wire shall consist of a core of homogeneous open-hearth, electric-furnace,