Cable Safety Requirements

1. When the cables cross each other, the high-voltage cable should be under the low-voltage cable. 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 crossed with the heat pipe, if there are thermal insulation measures, the minimum distance between parallel and cross is 0.5m and 0.25m respectively.

3. When the cable crosses the railway or road, it should be protected by a pipe, and the protection pipe should extend beyond 2m from the track or road surface.

4. The distance between the cable and the foundation of the building 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 protection pipe should also extend 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 cables directly buried in the ground should generally not be less than 0.7m, and should be buried under the frozen soil layer.