1. Cable laying mode selection should be according to the engineering conditions, the characteristics of the environment and the cable type, such as the number of factors, and meet the reliable operation, easy maintenance and technical and economic reasonableness principle.

 

2. cable buried way, shall meet the following requirements:

 

(1) less than six roots 35 kV and below the power cable same pathway, in the factory leading to the long-distance auxiliary facilities or suburb is not easy to have regular excavation area, should adopt directly buried; in the urban pavement easy to revision or the edge of the road, also can use direct burial.

(2) in the plant many underground pipe network section, there may be a place of molten metal, high temperature liquid overflow, to be developed to have more frequent excavation, not use buried.

(3) in the range of soil chemical corrosion or corrosion of stray current, shall not be buried.

 

3. cable pipe laying mode selection, shall meet the following requirements:

 

(1) in explosion hazardous area branny cable, exposing the cable floor need to be protected, and the underground cable and highway, railway cross should be used pipe wearing laying.

 

(2) underground cable through the house, square section, and cable laying planning as the road lot, should the wear tube.

 

(3) in the underground pipe network more dense plant area, urban roads narrow and heavy traffic or road excavation difficulties such as the number of cable channels, can be used to wear tube.

 

4. the following places should adopt the shallow groove laying method:

(1) high underground water level places.

(2) channel power cable is less in quantity, and often do not have in the truck through the outdoor distribution equipment etc.

 

 

5. cable trench laying choice, should comply with the following provisions:

(1) in place of chemical corrosion liquid or molten metal overflow, or in areas frequented by vehicle load shall not use cable trench.

(2) often plant industrial water overflow, combustible dust filled, should not be used for cable channel. (3) in the factory, there are a large number of buildings in the underground cable but don't need through a tunnel. Urban pavement excavation inconvenience and cable laying stage, also do not belong to the above, the appropriate use of cable trench.

(4) with explosion and fire prevention requirements cable, should adopt buried sand laying cable duct.

 

6. laying cable tunnel, shall meet the following requirements:

(1) underground cables number of the same channel are many, cable duct is not enough to accommodate, shall adopt cable tunnel.

(2) There is a large number of underground cable in the same channel, and is located in the corrosive liquid or ground water overflow place often, or containing above 35kV and above high voltage cables and crossing the road, railway and other areas, should adopt cable tunnel.

(3) limited by urban underground passage or larger road traffic flow, with many cables along the same path non high temperature water, gas and communication cable pipeline joint configuration, can in the utility tunnel laying cables.

 

7. Perpendicular to the strike the cable should be along the wall, column installation; when there are  large number, or containing more than 35kV high voltage cable should be adopted shaft laying.

 

8. The control room, the number cable relay protection room etc., should be arranged at the lower part of the cable layer. Cable layer with movable cover board can also be used when the number of cables is low.

 

9. in high water level, chemical corrosion liquid overflow place, workshop should be adopted to support type overhead laying. When the building or the plant is not to be laid down, it can use overhead laying.

 

10. surface and should not be used to support the overhead laying place, can use hanging overhead laying.

 

11. through cable rivers, reservoirs, bridges, dams with unconditional laying, can take underwater laying.

 

12. Plant within overhead bridge laying way should not set the maintenance channel, city cable line overhead bridge laying mode can be set the maintenance channel.