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1. Overload. Overload is when a line or component is operating under a load greater than its rated value, causing excessive current in an electrical appliance and heating of electrical equipment. Long-term overload will reduce the line insulation level, short-circuit or even burn out equipment or lines. 2, short-circuit, short-circuit refers to the current does not flow through the electrical appliances directly connected by the closed circuit wires, equivalent to a direct connection between the power supply poles. When the power supply is short-circuited, the electric current on the circuit is very large, causing the temperature of the conductor to rise, which may cause spontaneous combustion in severe cases. 3. The influence of fuse and line matching, the selection of fuse wire should match with the wire diameter, the position should be arranged reasonably, otherwise it will lose the function of circuit protection.