... .OEM accepted 4.factory, free sample Copper conductor Mechanical Control cablePVC control cable Conductor:Copper Insulation:PVC,XLPE ... in ducts and in ground,able to withstand heavier mechanical force, and for fixed installation KVVRCopper conductor PVC insulated ... be flame retardant and able to bear beavier external mechanical force, and for fixed installation ZRKVVRCopper conductor PVC insulated ...