richardzhng 发表于 2011-12-12 19:38 8 F3 S( t5 u# p" n; L T t& |are you sure it is three phases and one neutral, not three phases and a ground?
9 v( P5 d* x {"are you sure it is three phases and one neutral, not three phases and a ground?" " a8 I; Q+ O, B 1 ^: u& O! q/ q7 x$ x% d; k+ ?9 F& K9 c
I am sure . Would you gave me some advice? thanks!