... laying indoor,tunnel,channel and undergroud,Unable to bear external mechanical force,but bear the traction force ... ,tunnel,channel and undergroud Able to bear external mechanical force,but unable to bear large pulling forceYJV32YJV32YJLV32YJLV32XLPE Insulated, ... shaft with large difference of level.Able to bear external machanical force and maderate pulling forceYJV42YJV42YJLV42YJLV42XLPE Insulated, ...