Quality control during maintenance of high-voltage electrical equipment. The maintenance personnel of high-voltage electrical equipment must be professionally trained and familiar with the internal structure of the equipment

Low-voltage electrical equipment: refers to the low-voltage electrical equipment we refer to in daily life refers to equipment that undertakes on-off control in the 380/220V power grid

Switching appliances: such as circuit breakers, isolating switches, load switches, grounding switches, etc.

There are many types of low-voltage electrical appliances, and there are many classification methods.