Experts explain in detail the spacing requirements between the outer skins when laying multiple cables with the same trench

With the improvement of citizens' requirements for quality of life and living environment, the "spider web" formed by the weak current lines on both sides of the road or across the road and densely intertwined is no longer the modern "symbol" of the city, but hinders the image of the city, and is accompanied by many potential safety hazards
.
Why not the public who is eager for the government to sort out the exposed wires and cables and lay them on the ground, which can not only protect the cables but also reduce the occurrence of accidents?

The harm caused by open-air wires has made the cable into the ground has attracted much attention, and has been recognized and supported by most countries, especially the countries with rapid urbanization process are more fond of cable entry, which can not only beautify the urban landscape, improve the popularity of the city, but also reduce the probability of external damage to the wire, reduce accidental losses, which can be described as killing two birds with one stone
.
Let's talk about what requirements should be met when multiple cables are laid or crossed with each other in the same trench?

1.
The minimum clear distance between power cables and control cables is 0.
1m for 10kV and below, and 0.
25m for more than 10kV; the cables used in different parts (including communication cables) are 0.
5m between each other, and if separated by cable partitions, it can be reduced to 0.
1m, and there is no provision
for penetrating into the pipe.

2.
The minimum clearance when the cables cross each other is 0.
5m
.
The cable is within 1m before and after the intersection, if separated by a partition, the above interval can be reduced to 0.
25m, and it is not specified
when penetrating into the pipe.

3.
Cables should be kept at a certain interval when they are parallel or crossed for the following reasons:

When inspecting cables, if the adjacent cables are too close together, it can easily cause mechanical trauma
.
In order to prevent the cable from failing during operation and burning out adjacent cables, proper spacing should be maintained between cables; The distance between cables is too close to dissipate heat, which affects the current carrying capacity of the cable; If the cables are close to each other or crossed without maintaining a certain interval and contact each other, "AC erosion"
is easily generated.

Once the cable laid in the cable trench fails, it will not only have a direct impact on the city's electricity consumption, but also may cause the relay protection or control loop to fail, causing the accident to expand or even damage the main equipment, and cannot resume production
for a long time.
Therefore, the cable believes that it is necessary to strengthen the management of cable trench construction, protect the cable in the cable trench from damage, which is of great significance to the safe operation of power plants and substations, and ensure the safety and reliability of urban electricity, providing a solid foundation
for the rapid development of urban economy.