Cable safety requirements

High voltage cable

1. When cables cross each other, the high-voltage cable shall 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 approaches or crosses the thermal pipeline, 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 shall be protected by a pipe, which shall extend 2m beyond the track or pavement.
4. The distance between the cable and the building foundation shall ensure that the cable is buried outside the building apron; When the cable is led into the building, it shall be protected through the pipe, and the protective pipe shall also exceed the apron of the building.
5. The distance between the cable directly buried underground and the grounding of general grounding device shall be 0.25 ~ 0.5m; The buried depth of cables directly buried underground shall generally not be less than 0.7m and shall be buried under the frozen soil layer.