在正常情况下，所有的通电导体包括线路和各种电气设备、装置，都有阻止电流的流动而产生热量的特性，而一旦在配电系统中发生故障，就会打出火花、电弧引起可燃物着火。而在电气火灾中，以电气线路引起的火灾事故为多，主要原因有短路、过负荷、接触电阻过大等等。一般是由于 Under normal circumstances, all current conductors, including wiring and various electrical equipment and devices, have the property of preventing the flow of current and generating heat. Once a fault occurs in the power distribution system, a spark will be generated and the arc will cause combustibles on fire. In the electrical fire, the electrical circuit caused by fire accidents are more, the main reason for a short circuit, overload, contact resistance is too large and so on. Generally due to