richardzhng 发表于 2011-12-12 19:38 * `7 V9 q' y: i, O6 Rare you sure it is three phases and one neutral, not three phases and a ground?
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"are you sure it is three phases and one neutral, not three phases and a ground?"2 T7 Z/ M) G' M) u* V
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I am sure . Would you gave me some advice? thanks!