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 nductor 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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