Electrical fire caused by line failure is common for many reasons, mainly below for everyone to resolve the main cause of electric lines caught fire and prevention measures.
A main cause of the fire, electrical lines:
(A) short circuit. So-called short circuit is the circuit of communication two wires touch each other, current does not pass through the line of electrical equipment, and form a loop. Due to the resistance of the wire itself is relatively small, if only throughthe wires of the circuit current will increase rapidly, dozens of times, hundreds of times times greater than normal. Such a large current through a thin wire, due to greater resistance, generated more heat, in a very short period of time the wire has reached thousands of degrees Celsius temperature enough to ignite nearby flammablematerial, causing fire. Is caused by short circuit due to transmission lines used for too long, insulation aging, cracking, loss of insulation, two dash lines; or because thewiring, wire “coat” mechanical damage, causing a short circuit.
(B) poor contact. Due to poor wire joints, causing the line to excessive contact resistance heating fires. Every circuit connector or wire is connected between, or wires and switches, insurance or using equipment. If the connector is not good, would impede the flow of electric charge in the wire, and generate a lot of heat. When these hot enough to melt the wires insulation layer, the insulation would burst into flames and ignited nearby combustibles.
(C) circuit overload. Certain material and cross-sectional area of the wire and have some safe carrying capacity. If the current exceeds its safe carrying capacity of the wire, wires will heat up. Than the more heat the more. When the heat wire temperature exceeding 250 ℃, wire and rubber or plastic insulation fire burning. If a wire “jacket” damage, will cause a short circuit, the greater risk of fire. In addition, if a substandard fuse, circuit overload not found in time, risk becomes a reality.
(D) line leakage. Due to poor insulation of the wire insulation or on scaffolds, wiresand conductors or conductors and the Earth between trace current through. Peopleoften say, leak electricity is a serious phenomenon of leakage. Leakage when Miss spark and temperature can also be the ignition source of the fire.
(E) the spark and arc. Electric spark discharge between the extremes results; arc is formed by the huge swarms of EDM, temperatures can reach 3,000 degrees Celsius or more. Overhead wires swing in the wind, or in case of tree branches slapping, or in case of vehicle when hanging, make two lines touch, discharge, spark, ARC will occur.In addition, the leakage current of insulated wires, wire breakage, short circuit, grounding point and loose wire connections will spark, arc. These electric spark, electric arc, if falling on the combustible, inflammable and may cause a fire.
(F) the cable caught fire. Cable is will burning, is because laying cable Shi its protection lead skin by injury; or in run in the cable of insulation body by mechanical damage, caused cable core and cable core Zhijian or cable core and lead skin Zhijian of insulation body was breakdown and produced arc, led cable of insulation material jute cover occurred burning; or for cable long time overload makes cable insulation performance reduced even lost insulation performance, occurred insulation breakdown and makes cable burning; or because three-phase power system will be three core cable as single core cable using, That Vortex, lead, aluminum skin heating or melting, caused by burning.
Second, the measures to prevent electrical wiring caught fire
(A) in accordance with the required lines. Install electrical wiring must be installed instrict accordance with the electrical regulations, specifically laying electrical lines. Electricians must be certified.
(B) select the correct electrical line. According to the work-life needs, possible loadof suitable specification of electrical lines, don’t over ground for cheap or poor quality wire. Selection of wiring to check whether is a qualified product.
(C) the safe use of electrical wiring. Installed electrical wiring, you cannot just pull, loaded, power out GE, increase the amount of electricity load of the entire line. Note about using the maximum load of the circuit, during use must not exceed this limit, or likely to cause an accident.
(D) always check the electrical circuit. Insist on regular checks, every once in a while is to consult a specialized electrician to help check the electrical wiring, insulation damage found and repaired in a timely manner. Wire age is 10-20 years, and found that age must be replaced immediately.
(E) choose safe electrical switches. To use factor high air switch, try not to use the knife switch. Knife switch on the switch will spark, prone to danger. Choose air switchpower protection role. When fuses are used, to choose the right fuse to avoid failure, the current increases, which can shut off the current.