GB/T12706 steel wire armored cable 1kV to 35kV
GB/T12706-2008 the rated voltage of 1kV to 35kV extruded insulation power cables and accessories or IEC60502 steel wire armoured power cable standard, the standard of steel wire armored requirements (according to GB/T12706.1-2008):
 
Material: steel wire should be galvanized steel wire. In AC circuit single core armored cable should be non-magnetic materials, non magnetic metal wire general is stainless steel wire, aluminum alloy wire.
 
Steel wire diameter requirements: 
nominal diameter of steel wire: 0.8 mm, 1.25 mm, 1.6 mm, 2 mm, 2.5 mm, 3.15mm (GB/T12706.1-2008), minimum diameter of steel wire is not less than 95% of nominal diameter.
 
Requirements: steel wire armour should be close, even if the gap between adjacent wires is minimum.
 
Material: steel wire should be galvanized steel wire.
 
Steel wire diameter requirements: nominal diameter of steel wire: 0.8 mm, 1.25 mm, 1.6 mm, 2 mm, 2.5 mm; diameter tolerance of steel wire shall be in compliance with GB/T 3082-2008.
 
Armour: steel wire armored by single wire left to or double wire inner right direction, the outer left to wrap, lining layer, and steel wire between the sum of gap should be not more than a wire diameter.

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