richardzhng 发表于 2011-12-12 19:38 3 d0 z3 _8 L# o- A/ v Vare 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?"* D5 g2 I; ]: _7 ?2 _5 a
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I am sure . Would you gave me some advice? thanks!