The ground connection of the light current system, mainly workinggrounding, aims to prevent electromagnetic noise and assures the equipment to work steadily and reliably.
弱电系统的接地以工作接地为主，目的是为了防止电磁干扰，保证弱电系统中设备稳定、可靠工作。
2
When the grounding switch is located at the switching-on state, the trolley cannot be entered into the working position to prevent switching on the grounding switch.
接地开关处于合闸状态，手车不能推到工作位置，防止带接地开关合闸。
3
According to related codes and standards the design method and some practice problems of grounding are discussed, combined with working principle of grounding of instrumentation and control system.