When the cable is worn, the sheath must not be damaged, and a non-corrosive lubricant (powder) can be used. The AC single-core cable must not be penetrated into the steel pipe alone.
In the following locations, the cable should have a protective tube with a certain mechanical strength or a protective cover:
1 Cable enters buildings, tunnels, and through floors and walls.
2 From the channel to the pole, equipment, the outer surface of the wall or the pedestrians in the house are easily accessible, a section below the ground height of 2m.
3 Other places that may be subject to mechanical damage.
The depth of the protective tube buried in the non-concrete ground shall not be less than 100mm; the length of the scattered water slope of the building shall not be less than 250mm, and the root of the protective cover shall not be higher than the ground.
There should be no water inside the pipe and no blockage of debris. When the cable is worn, the sheath must not be damaged, and a non-corrosive lubricant (powder) can be used.
The AC single-core cable must not be penetrated into the steel pipe alone.
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