For laying indoors, in tunnel and in ducts. Able to bear certain traction during laying but not external mechanical forces. Impermissible to lay single core cable in magnetic ducts.

• 敷设在室内、隧道内及管道种，可经受一定的敷设牵引，但不能承受机械外力作用，单芯电缆不允许敷设在磁性管道中。