richardzhng 发表于 2011-12-12 19:38 , i& m% x j/ W( Y
are you sure it is three phases and one neutral, not three phases and a ground?
) u, p" @* [0 D: Y9 L"are you sure it is three phases and one neutral, not three phases and a ground?" # l2 e2 O0 w8 ~1 P! J1 ^: R! N$ E; g& E0 |& }) g
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I am sure . Would you gave me some advice? thanks!