Cable safety requirements
1. When the cable lines cross each other, the high voltage cable should be below the low voltage cable. If one of the cables is protected by a pipe within 1 m before and after the intersection or separated by a partition, the minimum allowable distance is 0.25 m.
2. When the cable is close to or intersects with the heat pipe, if there is insulation, the minimum distance between parallel and cross is 0.5m and 0.25m respectively.
3. When the cable crosses the railway or the road, it should be protected by a pipe. The protection pipe should extend beyond the track or road surface by 2m.
4. The distance between the cable and the foundation of the building shall be such that the cable is buried outside the building's scattered water; the cable shall be protected by a pipe when it is introduced into the building, and the protective pipe shall be outside the building's scattered water.
5. The distance between the cable directly buried in the ground and the grounding of the general grounding device should be 0.25~0.5m; the buried depth of the cable buried directly in the ground should not be less than 0.7m, and should be buried under the frozen soil layer.