Is the device configured for two wire or fourwire systems?
设备是配置为二线制或四线制的系统吗？
2
In the Three phase and Fourwire circuit system, the neutral wire is very important.
在三相四线制供电系统中，中性线是非常重要的。
3
The equipment should be placed on the ground without violent vibration or on the working stage and connected in the power grid of 380v with three phase and fourwire.