richardzhng 发表于 2011-12-12 19:38 , I. R5 \! M. M! uare you sure it is three phases and one neutral, not three phases and a ground?
$ C2 B& v$ ^+ j, N. L5 |"are you sure it is three phases and one neutral, not three phases and a ground?" 4 I, j8 u9 a0 e' z ( h! R6 @0 {1 I* i) b$ h 1 P& _. Z& A6 o8 ~7 U% c ~2 jI am sure . Would you gave me some advice? thanks!