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。

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This article analysed the reason of dangerous voltage merging into from the connection way of ground connection system and equivalent circuit aspects, and put forward a solution.

从接地系统的连接方式和等效电路两个方面分析了危险电压串入的原因，并提出了解决办法。

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Never assume low voltage cannot be dangerous.

决不能认为低压电没危险。

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