低电压电路（即使它们是低电压）必须和保护地连接，这样危险电压才能被检测出来。
The low voltage circuit (even with low voltage on it) shall also be connected with protective earth, thus the dangerous voltage can be detected.
低电压电路（即使它们是低电压）必须和保护地连接，这样危险电压才能被检测出来。
The low voltage circuit (even with low voltage on it) shall also be connected with protective earth, thus the dangerous voltage can be detected.
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