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 pipe penetration or separated by partition within 1m before and after the intersection point, the minimum allowable distance is 0, 25m.

2. When the cable is close to or crossed with the heat pipe, if there is heat insulation measure, the minimum distance of parallel and crossed is 0, 5m and 0, 25m respectively.

3. When the cable intersects with the railway or road, it should be protected by pipe, which should extend 2m beyond the track or road surface.

4. The distance between the cable and the foundation of the building should ensure that the cable is buried outside the loose water of the building; When the cable is introduced into the building, it should be protected through the pipe, which should also be beyond the loose water of the building.

5. The distance between the cable directly buried underground and the grounding of the general grounding device shall be 0, 25~0, 5m; The buried depth of the cable directly buried underground should not be less than 0, 7m and should be buried under the permafrost.