Electrical fire generally refers to as electrical wiring, electrical equipment, appliances and power supply equipment failure to release the heat energy; such as high temperature, energy release of the arc, spark. As the hot surface of the electrical heating appliances, have ignited combustion conditions ontology or other fuel caused by the fire, also including the fire caused by lightning and static electricity.

Electrical fire reason can be divided into:

1. Leakage fire: mechanical damage, insulation aging line leakage flow, the leakage flow, as a result of local high temperature, electric arc or spark electrical fires.

2. Short circuit fire: phase line to line and line and zero line (or ground) at some point due to causes such as insulation damage a collision or contact, cause the electric circuits of current increases suddenly, far more than the normal operating line of heat, and in the short-circuit point is easy to produce strong
Of spark and arc, cause near flammable fuel combustion, causing a fire.

3. Overload fire: when the conductor by electrical flow than the safety load flow, the temperature of the conductor is rising, the calorific value exceed the permitted limits, light insulation aging faster, or can make insulation layer combustion and cause a fire.

4. Poor contact cause fire: the joint of wire and wire, wires and electrical equipment due to the contact surface processing well, loose connection, poor contact, local produce high resistance, under the action of electric current to generate heat, which may cause electrical wiring insulation layer, near flammable materials and product combustible dust is on fire.