richardzhng 发表于 2011-12-12 19:38 6 b x7 T3 ]5 x0 rare 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?" 9 e9 w; N2 k* R4 q# o ' }/ x5 P4 o4 Q0 v- s6 I* Q4 M& `% y$ M! T% @! k& h
I am sure . Would you gave me some advice? thanks!