richardzhng 发表于 2011-12-12 19:38 % R( O( }2 m2 S5 } l; S, l& w
are you sure it is three phases and one neutral, not three phases and a ground?
+ X' b2 k6 H" p8 u"are you sure it is three phases and one neutral, not three phases and a ground?" , @- _* I* `/ e6 h1 V y; {2 p8 X0 C( P4 J& l5 H( Z, R/ }) p' z7 K0 I
I am sure . Would you gave me some advice? thanks!