Common wire and cable fault analysis and buried cable requirements

Common faults of wire and cable lines in Dongguan include mechanical damage, insulation damage, insulation damp, insulation aging and deterioration, overvoltage, and cable overheating. When the above faults occur on the line, the power supply of the faulty cable should be cut off, the fault point should be found, the fault should be checked and analyzed, and then the repair and test should be carried out. The power supply can be restored after the fault is eliminated.

Safety requirements for buried cables

1. When the wire and cable in Dongguan cross each other, the high-voltage cable should be under the low-voltage cable. If one of the cables is protected by running pipes or separated by a partition within 1m from the intersection point, the minimum allowable distance is 0.15m.

2. When the cable is close to or crosses the thermal pipe, if there are heat insulation measures, the minimum distance between parallel and cross is 0.5m and 0.15m respectively.

3, cable and railway or road crossing should wear pipe protection, protection pipe should extend out of the track or road surface 2m.

4, the distance between the cable and the building foundation, should be able to ensure that the cable buried in the building outside the water distribution; When cables and wires in Dongguan are introduced into buildings, they should be protected by pipes, and the pipes should be beyond the building water.

5. The distance between the directly buried cable and the ground of the general grounding device should be 0.15~0.5m; Buried cables must be buried at a depth of at least 0.7m under the frozen soil layer