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Copper No. 2 kinds of alloy Wire cooper without lines, containing impurity, contain Copper quantity for 96% (minimum content 94%). Shall not contain excessive lead and tin change of copper wire, welding of copper, brass and bronze line, excessive oil, prohibition and nonmetal,crisp, burning line, utterly margin of fine copper and excessive sexual yarn. Need appropriate means to remove dirt. Birch Shall consist of clean, untinned, uncoated, unalloyed copper wire and cable, not smaller than No. 16 B & Srnwire gauge, free of burnt wire which is brittle