Four major causes of cable fire and explosion

Today, Shanghai flexible cable manufacturers to tell you the four causes of cable fire and explosion:

First, insulation damage caused by short circuit fault

The protective layer of the power cable is damaged when laying or the cable insulation is damaged by mechanical damage during operation, which causes the breakdown of the interphase or protective layer of the cable. The electric arc generated will cause the insulation material and the protective layer material of the cable to burn and catch fire.

2. Cable overload operation for a long time

Long time overload operation, the operation temperature of the cable insulation material exceeds the maximum allowable temperature of normal heating, accelerate the cable insulation aging, this insulation aging phenomenon, usually occurs in the entire cable line. Due to the aging of cable insulation, the insulation material loses or reduces the insulation and mechanical properties, so it is easy to break down, burn and burn, or even burn and fire simultaneously at many places along the entire length of the cable.

3. Insulation breakdown of the middle connector box

Because the middle joint of the cable joint box is not tight, welding is not strong or the joint material is not selected properly, the joint oxidation, heating and glue flow in operation; In the middle of the cable joint, the quality of the insulating agent injected in the middle of the joint box does not meet the requirements. When the filling of the insulating agent, the box memory has pores and the cable box is sealed badly, damaged and leaked into the moisture. The above factors can cause the insulation breakdown, the formation of short circuit, the cable explosion and fire.

Four, cable head combustion

As the surface of the cable head is contaminated by moisture, the porcelain bushing of the cable head is cracked and the distance between the leading wires is too small, which leads to flasshy fire, causing the insulation of the cable head surface and the leading wires to burn.