For laying in doors, in tunnels, in cable trench or direct in ground, able to bear external mechanical forces, but unable to bear large pulling force.
For laying in doors, in tunnels, in cable trench or direct in ground, able to bear external mechanical forces, but unable to bear large pulling force.
室内、隧道、电缆沟内或埋地等能承受机械外力的场所，但不能承受大的拉力。