... or three equal-section-area cores and two smaller section area neutral cores). 6. Standards: IEC 60502. IEC, BS, DIN, ASTM, CSA, ... the rated voltage:low voltage450/750V*rubber as insulation material and rubber as jacket material (like welding cable, waterproof submersible pump ... ,all the cables are strictly quality-controlled ,and all the cables are conform to IEC,we have certificates of ISO,CCC,ROHS ...