On the basis of maintaining the safe operation and correct operation of power equipment, we should pay more attention to the quality of equipment and materials used for power transmission, especially the quality of wires and cables in summer. Unlike other dangerous things, electricity is invisible and invisible, but once it is neglected, it is often a huge cost of life, Electricity can even be called an electric tiger. In fact, electricity itself is more terrible than a tiger.

Cable aging problem is a very big security risk, many fires caused by electricity are caused by cable aging problem, so it is very necessary to regularly check whether the cable is aging, but how to check whether the wire is aging still needs certain technology. The insulation of our common cables depends on the outer coating. However, after the cables have been used for a long time, they will be oxidized or corroded in the air, and the insulation performance of the cables will become lower and lower, eventually aging, hardening and even falling off. When the cables are aging to this degree, they basically have no insulation ability, Once the insulation is reduced to a certain extent, it is easy to be broken down in the process of use, resulting in fire, electric shock to employees and other accidents. Understanding the basic knowledge of judging cable aging can eliminate potential safety hazards. Here are some methods and experiences for judging cable aging

The first way is to check the appearance of the cable along the cable, that is, to observe the insulation layer of the cable. If it is found that the cable is hard, there are cracks in the outer layer, and the color is lustrous, dark, or even falling off, it means that the aging problem of the cable is serious. It is best to replace it in time to avoid danger.

The second is a more professional and accurate method, which is to use the insulation resistance meter to measure the insulation of electrical lines. The insulation of different lines has different allowable values. For example, the insulation resistance of household 220 V lines in use should not be less than 0.22 megohm; The wet value in rainy days should not be less than 0.1 megohm. If the measured insulation resistance value is less than the above value, it indicates that there is something wrong with the insulation of electrical lines. Of course, the service life of cables is different under different conditions.