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About the laying requirements of nuoxing cable, get it!

Release time:2021-05-13 Author:admin

Nuoxing cables are of various types and good quality, which are popular in the market. How to use them better and avoid dangerous accidents? Xiaobian tells you that it is very important to lay it correctly! Now let's understand the technical requirements of cable laying and installation.

1. The buried depth of cables shall not be less than 0.7m and 1.2m when crossing farmland. 100 mm fine soil shall be laid around the cable, and 100 mm above the cable shall be covered with cement guard board, whose width shall exceed 50 mm on both sides of the cable diameter.

2. When the cable is laid near the building, the distance between the cable sheath and the building foundation shall not be less than 0.6m (the principle is that the cable construction shall not be hindered by the building and the building structure shall not be affected).

3. When multiple cables are laid in the same trench or cross each other, the distance between cable sheaths shall meet the following requirements:

Nuoxing cable

(1) The small clear distance between power cable and control cable is 0.1M below 10kV, 0.25mv above 10kV; The distance between cables (including communication cables) used by different departments is 0.5m, which can be reduced to 0.1M by using cable partition, and there is no regulation for threading.

② When the cables cross each other, the smaller clear distance is 0.5m. If the cables are separated by partitions within 1m before and after crossing, the above distance can be reduced to 0.25m, which is not specified when crossing into the pipeline.

③ When cables are parallel or crossed, the following reasons should be considered to keep a certain distance:

When repairing cables, if the distance between adjacent cables is too close, it is easy to cause mechanical damage. In order to prevent the adjacent cables from burning down due to cable fault during operation, proper distance should be kept between cables. The distance between cables is too close to dissipate heat, which affects the current carrying capacity of cables; If the cables are close to or cross each other and cannot keep a certain distance and contact each other, it is easy to produce "AC corrosion".

4. When the cable approaches or crosses the underground pipeline, the clear distance between the cable and the pipeline shall not be less than the following provisions:

(1) When the cable is close to the heat pipe, the small clear distance is 2m, if it is separated by a partition, it is 1m.

② When the cable is close to the combustible gas and liquid pipeline, the smaller clear distance is 1m.

③ When the cable is close to other pipelines, the smaller clear distance is 0.5m

④ When the cable passes through various pipelines, the smaller clear distance is 0.5m

⑤ Parallel laying of cables above or below pipes is prohibited.

5. When crossing city streets, highways or railways, cables should be laid in pipelines. The inner diameter of the pipe shall not be less than 1.5 times of the outer diameter of the cable, and shall not be less than 100 mm;; The depth from the top of pipeline to the bottom of track or pavement shall not be less than 1m; The distance from the drainage ditch shall not be less than 0.5m; The depth from the urban street sidewalk should not be less than 0.7m; In addition to the width of crossing highway or track, the length of pipeline should be extended 2m at both ends; On urban streets, the length of the pipe should extend beyond the driveway.

Sichuan environmental protection cable

6. When the cable is laid parallel to the railway, the small clear distance between the cable and the railway track is 3M. This is to reduce the damage of the cable lead package caused by the vibration caused by the train passing; On the other hand, convenient maintenance is also considered. When the cable is laid in parallel with the electrified railway, the clear distance between the cable and the track shall not be less than 10m in order to prevent electrochemical corrosion of the cable protection layer caused by stray current leakage from the track to the ground.

7. When directly buried cables are introduced into tunnels, man-made wells and buildings, they should be put through pipes and blocked at nozzles to prevent water seepage.

Pipe orifice plugging method: fill the pipe with oil and hemp, then pour asphalt into the pipe orifice, or seal the pipe orifice tightly with cement and lime.

8. When the cable is led out from underground or cable trench to the ground, in order to prevent mechanical damage, the section 2m above the ground shall be protected by metal pipe or metal cover, and its root shall extend 0.1M below the ground.

9. For cables laid in parallel underground, the position of indirect header shall be staggered, and the clear distance shall not be less than 0.5m, so as to facilitate joint construction and reduce cable line corridor. There should be a protection box outside the intermediate joint box to prevent mechanical damage.

10. For the cable lines laid in the suburbs and open areas, there are no fixed signs such as buildings, which brings a lot of difficulties for drawing cable drawings and future operation and maintenance.

Therefore, it is necessary to lay a cable pile every 50m ~ 100m at the turning, joint and straight line of the line, mark the specific position of the cable, and mark the position and quantity of the pile on the cable plan for operation and maintenance.

11. Armored cables are generally used for cables buried directly underground to prevent mechanical damage during laying or operation.

The above is to share with you the correct installation method and technical points of nuoxing cable. For more information, please pay attention to our website!