Installed indoors, in tunnel, ditch and conduit as well as in lose soil, unable to bear external mechanical forces, but can bear the traction force during cable installation.

• 适用于室内.；隧道、电缆沟及管道中；也可埋在松散的土壤中；不能承受外部机械作用力；但可承受一定的敷设牵引。