It is made accord to the A.W.G standard.the material of conductive part is 99.99% copper.the insulating part is made of pvc or nylon.
conductor cross section:
Sp1:Least 0.75×1+0.5 mm2×1  Most1.5×2mm2
Sp2:Least 0.75×3 mm2               Most1.5×3mm
Sp3:Least 0.75×3 mm2               Most 1.5×3+1×1 mm2
Sp4:Least 0.25×1+0.75 mm2×1Most 2.5×4+0.75×1 mm2
Sp5:Least 0.25×2 mm2               Most 6×2+4×2 mm2
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