1、过载

    过载是指线路或者部件工作的负荷超过额定值,导致电器电流过大，用电设备发热。线路长期过载会降低线路绝缘水平，出现短路甚至烧毁设备或线路。

2、短路

      短路是指电流不流经用电器直接由导线接通(称闭合回路)，相当于直接连接电源两极。电源短路时电路上的电流非常大，使导线的温度升高，严重时有可能造成自燃。

3、熔断器与线路匹配影响

     熔断丝的选用需与导线线径匹配，位置应合理布置，否则会失去应有的电路保护作用。

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.