How much do you know about the cause of the cable "fire"?
According to Xinhuanet.com, a "crackdown" cable incident took place in Gao'an City, Jiangxi Province. The local people reported that they had no electricity after hearing loud noises outside. The inspection personnel found that the result of the repairs was a "blasting" incident on the power cable.
This is a very typical cable “shotgun†incident. As wire and cable workers and wire and cable related practitioners, this phenomenon should be understood. So, what is the phenomenon of "blasting" the cable? Rong Xiaobian made a brief introduction for everyone.
Wire and cable “spraying†means that a short circuit occurs inside the cable or the connector part of the cable for a short time, which in turn generates a large amount of heat, resulting in a cracked or burned part at the fault. If the fault occurs at a higher voltage line, the short circuit will generate enough heat. And a very strong burst occurred, and along with a loud explosion, the formation of the so-called "shot gun" accident.
Knowing what is the "shot" of the cable, we have to understand what causes the cable to "fire". The reason is very large. The main reasons are as follows -
1. Insulation reasons: The use of unqualified insulation sheaths in the process of cable formulation, too many impurities in the insulation, and bubbles, etc., or the aging of the cable for a long time in disrepair, resulting in the cable insulation can not be very good protection conductor, resulting in burst;
2. Causes of conductors: Unqualified cables use more conductive impurities. Long-time power-on will generate large amounts of heat, causing bursts.
3, external causes: cable moisture or water, causing internal cable short circuit, burst;
4. Reasons for wiring: The operator does not have a standard operation during the cable connection, resulting in burst at the connection area.
5, the bending radius is too small, external mechanical damage, DC resistance test ion release is not complete, rated current overload, resulting in burst.
The accident of the cable “blasting†is a very serious danger. The lighter ones break the power and damage the cables, and the others seriously injure the safety of people. Therefore, it is necessary to avoid them as much as possible.
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