Basic Principles for Laying Cables Underground

1.Under normal circumstances, the buried depth of the cable sheath to the foundation of the underground structure shall not be less than 0.3m.

2.The depth of the cable sheath to the ground shall not be less than 0.7m; when it is located in the roadway or underground, it should be properly deepened and should not be less than 1.0m.

3.The cable shall be laid in the trench and shall be laid with soft soil or sand layer with a thickness of not less than 100 mm along the upper and lower sides of the cable.

4.A protective plate with a width of not less than 50 mm shall be covered on both sides of the cable along the entire length of the cable, and the protective plate shall be made of concrete.
5.When the cable is buried and laid directly in the town, it is advisable to lay a conspicuous sign belt on the upper layer of the protection plate.

6.Located in a suburban or open area, along the cable path, the line spacing of 100m, turning or joints should be erected with obvious azimuth signs or stakes.

7.When the cable is laid through the bellows and laid in the trench, the plain concrete with a thickness of not less than 100 mm shall be cast along the entire length of the bellows. Width should not be less than 50 mm outside the tube,cable can be free of armor.