低压供用电系统中为了减少发生人身电击事故和接地故障切断电源时引起的停电，必须加装剩余电流动作保护装置。

In order to reduce the power cut off which caused by electric shock accident and earth-fault power cut off, it must install residual current operated protective device.

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文中详细论述了剩余电流动作保护装置的参数选用，安装要求，低压电网接地方式及安装施工要求等。

This paper introduces the parameter selection, installation, grounding mode of low-voltage power grid and construction method of residual current operated protective device.

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