Earthing connector of socket will not connect to neutral connector. 3 phase socket at the same place connect wires in same way.
插座的接地端子不与零线端子连接。同一场所用的三相插座，接线的相序一致；
Turn on the phase meter and touch each plug of the socket;
打开相位计，并碰触插座的每个插孔；
Turn on the phase meter and touch each plug of the socket;
打开相位计，并碰触插座的每个插孔；
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