... .9/3.3kv(coal mining cable,flame retardant cable,mining cable) flexible mining machine cable /1.9/3.3kv(coal mining cable,flame retardant cable,mining cable)1.rated voltage is ... radius should be 6times of cable outer diameter.(coal mining cable,flame retardant cable,mining cable) flexible mining machine cable /1.9/3.3kv(coal mining cable,flame retardant cable,mining cable)