Cable is usually made of several or several groups of wires (each group of at least two) stranded into a rope-like cable, each group of wires insulated from each other, and often twisted around a center, the entire outside of the package with a highly insulating cover.More erected in the air or installed in the underground, underwater, for telecommunications or power transmission.Cables can be divided into power cables, communication cables and control cables according to its use.So when the cable is used, is there any safety requirements?What are its protective measures?How to store it?

safety requirement

1.When cables cross each other, the high voltage cable should be below the low voltage cable.If one of the cables is protected by a pipe or separated by a partition within 1m before or after the crossing point, the minimum permissible distance is 0.25m.

2. When cables and heat pipes are close to or cross, if there are insulation measures, the minimum distance between parallel and cross is 0.5m and 0.25m respectively.

3. When the cable crosses with the railroad or road, it should be protected through the pipe, and the protection pipe should extend beyond 2m from the railroad or road.

4. The distance between the cable and the foundation of the building should be able to ensure that the cable is buried in the building outside the bulk water; cable into the building should be protected through the pipe, the protection pipe should also be beyond the building outside the bulk water.

5. Directly buried in the ground cable and the general grounding device should be 0.25 ~ 0.5m between the grounding; directly buried in the ground cable burial depth, generally should not be less than 0.7m, and should be buried in the permafrost layer.

Protection Measures

With the rapid development of power cable buried laying project, higher requirements for cable protection, cable protection casing is made of polyethylene PE and high-quality steel pipe through sand blasting and shot blasting pre-treatment, plastic dipping or painting, heating and curing process.It is the most commonly used to protect wires and cables, a kind of electrical insulation tube.Because of good insulating properties, high chemical stability, no rust, no aging, can be adapted to harsh environments and is widely used.

Using cable protection sleeve to protect cables can achieve the following advantages:

1, good corrosion resistance, long service life, can be used in the humid saline and alkaline areas.

2, good flame retardant, heat resistance, can be used for a long time at a high temperature of 130 degrees without deformation, not burning in case of fire.

3、High strength and high rigidity.Used in the roadway under the direct burial without the need to add a protective layer of concrete, can roll fast cable project construction progress.

4, cable protection sleeve both pipe and fittings have a certain degree of flexibility, can withstand external heavy pressure and foundation settlement caused by damage.

5, has a good resistance to external signal interference performance.

6, the inner wall is smooth, do not scratch the cable.The design adopts socket type connection, which is convenient for installation and connection.The joints are sealed with rubber seals to adapt to thermal expansion and contraction as well as to prevent mud and sand from entering.

Storage Methods

If cables are to be stored for a long period of time, the following considerations should be made depending on where the cables are placed:

1. under the eaves.Cables only when not directly exposed to sunlight or ultra-high temperatures, standard LAN cables can be applied, it is recommended to use conduit.

2. exterior walls.Avoid direct sunlight exposure to the wall and human damage.

3、In ducts (plastic or metal ones).If in the pipe, pay attention to the damage of plastic pipe and the heat conduction of metal pipe.

4、Suspended application/overhead cable.Consider the sag and pressure of the cable, which bundling method is intended, and whether the cable is exposed to direct sunlight.

5、Laying directly in the underground cable trench, this environment is the least controlled.Cable trench installations should be checked regularly for dryness or dampness.

6、Underground conduits.In order to facilitate future upgrades, cable replacement and isolation from surface pressure and the surrounding environment, auxiliary pipeline isolation, auxiliary pipeline is a better method.But do not hope that the pipe will always remain dry, which will affect the choice of cable type.

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