Safety requirements when using wires and cables
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A cable is usually a rope-like cable made by twisting several or several sets of wires (at least two in each group). Each set of wires is insulated from each other and often twists around a center. The entire bread has a height. Insulation coating. They are set up in the air or installed underground and under water for telecommunications or power transmission. Cables can be divided into power cables, communication cables, and control cables according to their use. So when the cable is used, is there any safety requirement? What is its protection? How to store? The details are as follows:
Safety requirements
1. When the cables cross each other, the high voltage cable should be under the low voltage cable. If one of the cables is protected by a pipe within 1m in front of the intersection or separated by a partition, the minimum allowable distance is 0.25m.
2. When the cable is approaching or intersecting with the heat pipe, the minimum distance between parallel and crossover is 0.5m and 0.25m, respectively, if there is heat insulation measure.
3. Pipes should be protected when they intersect with railways or roads. The protection pipe should extend beyond the track or road 2m.
4. The distance between the cable and the foundation of the building shall ensure that the cable is buried outside the building's loose water; when the cable is introduced into the building, the protection shall be worn, and the protection pipe shall also be beyond the building's loose water.
5. The distance between the cable directly buried in the ground and the grounding of the general grounding device shall be 0.25~0.5m; the buried depth of the cable directly buried in the ground shall not be less than 0.7m, and shall be buried under the frozen soil.
With the rapid development of the buried construction of power cables, the higher requirements for cable protection, the cable protection sleeve is made of polyethylene PE and high-quality steel pipe through sand blasting pretreatment, dipping or coating, heating and curing Process made. It is an electrical insulation tube that is most commonly used to protect wires and cables. Because it has good insulation properties, high chemical stability, no rust, no aging, can adapt to harsh environments and is widely used.
The use of cable protection sleeve to protect the cable can achieve the following advantages: 1. Good corrosion resistance, long service life, can be used in wet salt and alkali areas. 2, flame retardant, heat resistance, can be used under 130 degrees of high temperature without deformation, in case of fire does not burn. 3, high strength and high rigidity. Used directly under the carriageway without the need for additional concrete protection, it can roll the construction progress of the fast cable project. 4. Cable protection sleeves, whether they are pipes or fittings, have a certain degree of flexibility, which can withstand the damage caused by external heavy pressure and foundation settlement. 5, has a good anti-interference signal performance. 6. The inner wall is smooth and does not scratch the cable. The design adopts socket-type connection to facilitate the installation and connection. The rubber sealing ring seal at the joint not only adapts to thermal expansion and contraction, but also prevents mud sand from entering.

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