The Five Major Reasons That Easily Cause A Cable Fire And Explosion?

1. Short circuit fault caused by insulation damage

When the power cable is laid, the protective layer is damaged or the cable insulation is mechanically damaged during operation, resulting in the breakdown of the cable phase or the protective layer, and the arc generated causes the cable insulation material and the outer protective layer to burn and ignite.

2. Long-term overload operation of the cable

Under long-term overload operation, the operating temperature of cable insulation material exceeds the maximum allowable temperature for normal heating, which accelerates cable insulation aging. This insulation aging phenomenon usually occurs throughout the cable line. Due to the aging of the cable insulation layer, the insulation material loses or reduces the insulation performance and mechanical properties, so it is easy to fire and burn, and even burn and fire along the length of the cable.

3, intermediate connector box insulation breakdown

The middle joint of the cable joint box is not tightly crimped, welded firmly or the joint material is not properly selected, and the joint is oxidized, heated and bonded during operation; When making the middle connector of cable, the quality of the insulating agent poured into the middle connector box does not meet the requirements. When the insulating agent is poured, there are pores in the box, and the cable box is badly sealed, damaged, and the water leakage. The above factors will cause insulation breakdown, short circuit formation, resulting in cable explosion and fire.

4, cable head burned

Because the surface of the cable head is contaminated with moisture, the porcelain bushing of the cable head is broken, and the lead wire is too thin, which causes arc flying and fire, and causes the insulation combustion between the cable head and the lead wire surface.

5. External fire source and heat source cause cable fire

Such as oil system fire spread, oil circuit breaker explosion fire spread, boiler pulverizing system or coal conveying system coal spontaneous combustion, high temperature steam pipe baking, acid and alkali chemical corrosion, electric welding spark fire, can make the cable fire.