In the spontaneous combustion accident caused by line fault, the main reason is taking iron. In particular, many new car users, they just bought a love of the car. There may be added burglar alarms, high-end video and audio systems, modified or added lights to improve the shape of the vehicle, and a number of on-board appliances. However, due to the lack of professional modification shops, the route layout and specific structure of the vehicle were not analyzed, and the power of the line was not checked. For this reason also appeared random random lead wire, the place that loads big does not add insurance, easy friction place also did not fix effectively wait for a variety of error to refit. Once the aging of the line, overload, short circuit, poor contact or wear and tear tie iron problems, tie iron will produce a lot of heat, plus poor wire quality or surrounding flammable goods, spontaneous combustion accident will be inevitable.
　　Common faults are: cable and frame, wire clip between the friction caused by vibration skin; Tail light, brake light wire and other friction due to vibration caused by skin breaking; Lamp holder installation place due to vibration, connector damage and insulation parts loose, damage; Will be in the vehicle driving or parking when their own iron and for a long time jump fire, produce high temperature, cause electrical appliances, switches, wire insulation damage, and then increase the jump fire range, expand the high temperature area, and finally lead to paint, leakage of gasoline, flammable items and other contact and spontaneous combustion fire.