richardzhng 发表于 2011-12-12 19:38 7 _' E- C# }/ g: {6 j' n
are you sure it is three phases and one neutral, not three phases and a ground?
! q6 O; _# U- u* i0 e"are you sure it is three phases and one neutral, not three phases and a ground?"' s4 G/ Z r$ Y$ S! D, w
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I am sure . Would you gave me some advice? thanks!