For laying indoors, in tunnel, in cable trench or direct in ground, able to bear external mechanical forces, but unable to bear large pulling force.
For laying indoors, in tunnel, in cable trench or direct in ground, able to bear external mechanical forces, but unable to bear large pulling force.
室内、隧道、电缆沟内或埋地敷设等，能承受一定的机械外力，但不能承受大的拉力。