richardzhng 发表于 2011-12-12 19:38 % q- A& f) K, S$ Y `/ p: Qare 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?" $ ?* ~$ k* E: r! N& L/ `' n4 e- i6 f8 r2 k2 s) q
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I am sure . Would you gave me some advice? thanks!