1、 电表箱上的全部电器开关，应动作灵活可靠，无显着噪声，连接线结头和接线柱应无松动现象，动触头连接线结头处钢丝应无断裂现象。
1. All the electrical switches on the meter box shall be flexible and reliable without significant noise, no looseness of the connecting wire knot and the terminal, and no fracture of the steel wire at the connecting wire knot of the moving contact.
2、更换熔丝时，应使熔断电流与该回路的电流相匹配。
2. When replacing the fuse, make the fuse current match the current of the circuit.
3、控制箱上有不同性质的电压，在维修保养时必须分清电路，防止发生短路事故。
3. There are different types of voltage on the control box. The circuit must be distinguished during maintenance to prevent short circuit accident.
4、断开电源，检查控制柜的机架是否有可靠的接地，并使接地电阻不大于4Ω。
4. Disconnect the power supply, check whether the frame of the control cabinet has reliable grounding, and make the grounding resistance not greater than 4 Ω.
5、用软刷或吹风清楚屏板插件和全部电磁开关零件的积尘，并检查控制箱内电器开关触头的状态，接触情况，线圈外表的绝缘以及机械部件的动作是否可靠。
5. Use a soft brush or blower to clear the dust accumulation of the panel plug-in and all electromagnetic switch parts, and check the status and contact condition of the electrical switch contact in the control box, the insulation of the coil surface and the action of the mechanical parts.