What causes wire and cable fires and explosions?

I. What causes wire and cable fire and explosion? Power cable protection lead skin in the laying of the cable was damaged or in operation cable insulation by mechanical damage, caused by the cable phase or between the lead insulation breakdown, resulting in an arc so that the insulation material and the cable outside the protective layer of material combustion fire. 1. cable overloaded for a long time to run for a long time overloaded to run, the cable insulation material running temperature exceeds the normal heat *** high allowable temperature, so that the cable insulation aging dry, the cable insulation dry. This insulation aging dry phenomenon, usually occurs throughout the cable line. Due to the cable insulation aging and drying, so that the insulating material to lose or reduce the insulating properties and mechanical properties, and thus prone to breakdown fire burning, and even along the entire length of the cable at the same time in a number of combustion fire. 2. intermediate joint box insulation breakdown cable joint box intermediate joints due to the crimping is not tight, welded poorly, or improper selection of joint materials, running joint oxidation, heat, flow of glue; in the middle of the cable joints to do Infused in the middle of the joint box insulating agent quality does not meet the requirements, filling insulating agent, the box within the memory of the air holes and cable box sealing is poor, damaged and leakage into the moisture, the above factors can cause insulation breakdown, the formation of short-circuit, so that the cable explosion fire. 3. cable head burning due to the surface of the head of the cable moisture accumulation of pollution, the cable head of the ceramic casing rupture and the distance between the phases of the lead wire is too small, resulting in a flashover fire, resulting in the head of the surface insulation and lead wire insulation combustion. Insulation and lead wire insulation combustion. 4. External sources of fire and heat leading to cable fires, such as the spread of fire in the oil system, the spread of the oil circuit breaker explosion fire, boiler pulverizing system or coal system coal powder spontaneous combustion, high-temperature steam pipeline baking, chemical corrosion of acids and alkalis, welding sparks and other fires, can make the cable to produce a fire.

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