richardzhng 发表于 2011-12-12 19:38 & ~$ }6 \" K0 ?6 h6 e2 f# Z3 ~are 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?"! L \3 h, j* s- A
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I am sure . Would you gave me some advice? thanks!