With the public's quality of life, the requirements of the living environment, the original road sides or across the road, densely woven together in the formation of weak power lines "spider web", is no longer the city's modern "logo", but rather impede the city's outlook on the image, but also with a number of potential safety hazards. Citizens look forward to the government will be exposed wires and cables to organize, will be laid into the ground, both to protect the cable, but also to reduce the occurrence of accidents, why not do it?

　　The hazards of open wires make the cable into the ground is of great concern, recognized and supported by the majority of countries, especially the rapid urbanization of the country is fond of cable into the ground, both to beautify the cityscape, improve the city's visibility, but also to reduce the wire by the external violation of the chances of reducing accidental losses, can be said to be two birds with one stone. Here we talk about, more than one cable with the ditch laying or cross each other, the interval between the cable sheath should comply with what requirements?

　　1. Power cables between each other or with the control cable between the minimum net distance of 10kV and the following 0.1m, 10kV or more for 0.25m; different parts of the use of cables (including communication cables) between each other for 0.5m, such as separated by cable partitions, it can be reduced to 0.1m, through the pipe does not provide.

　　2. cables cross each other when the minimum clear distance of 0.5 m. Cables before and after the intersection of 1 m range, such as the use of bulkheads separated, the above interval can be reduced to 0.25 m, into the pipe without provisions.

　　3. cable parallel or cross to maintain a certain interval is to consider the following reasons:

　　Inspection of cables, if the neighboring cables are too close to easily cause mechanical trauma. In order to prevent cable failure in operation and the neighboring cable burned, so the cable should be maintained at an appropriate interval; cable spacing is too close to not easily dissipate heat, thus affecting the cable's current-carrying capacity; if the cable is close to each other or cross each other can not maintain a certain interval and contact each other, it is easy to produce the "alternating current erosion".

　　Cable trench cable laid in the event of a failure, not only on the city of electricity has a direct impact, but also may make the relay protection or control circuit failure, resulting in the expansion of the accident or even damage to the main equipment, a long time can not resume production. Therefore, the cable that must strengthen the management of the cable trench construction, to protect the cable trench cable from damage, the safe operation of power plants and substations has a very important significance, and to protect the safety and reliability of the city's electricity, for the rapid development of the city's economy to provide a solid foundation.