... tunnel tube and serious polluted places. Cable cannot undertake mechanism outside force VLY VV22 PVC insulated steel belt armored and ... mining well and serious polluted places. Cable cannot undertake mechanism outside force VLV23 VV32 PVC insulated fine steel wire armored ... at indoor, underground and mining well. Cable can undertake mechanism outside force VLV32 VV33 PVC insulated fine steel wire ...