... production according to IEC or GB standard . BV : Copper core , PVC insulated , without sheath power line . ... , PVC insulated , without sheath power line . BVR: Copper core , PVC insulated , flexible power line . 227 IEC ... 227 IEC 05 ( BV) : not more than 90°C, single core solid conductor without sheath power line . ii ... than 90°C,other not more than 70°C,installation temperature not lower than 0°C. this ...