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What are the safety requirements for cables?

Updated:08-03-2021
Summary:

1. When the cables cross each other, the high-voltage c […]

1. When the cables cross each other, the high-voltage cables should be under the low-voltage cables. If one of the cables is protected by a pipe or separated by a partition within 1m before and after the intersection, the minimum allowable distance is 0.25m.
2. When the cable is close to or crossing the heating pipe, if heat insulation measures are provided, the minimum distance between the parallel and the crossing is 0.5m and 0.25m respectively.
3. When the cable crosses the railway or road, it should be protected by a pipe. The protective pipe should extend 2m beyond the track or road.
4. The distance between the cable and the building foundation should be able to ensure that the cable is buried outside the building's water; when the cable is introduced into the building, it should be protected by a pipe, and the protective pipe should also be beyond the building's water.
5. The distance between the cables directly buried in the ground and the grounding of the general grounding device should be 0.25~0.5m; the buried depth of the cables directly buried in the ground should generally not be less than 0.7m, and should be buried under the frozen soil layer.

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