richardzhng 发表于 2011-12-12 19:38 7 Y* C. x! ]8 U- }are you sure it is three phases and one neutral, not three phases and a ground?
+ w5 a. e7 R8 a* N" w"are you sure it is three phases and one neutral, not three phases and a ground?" 0 t5 p7 a1 C6 a/ j5 \ 7 I+ \+ _9 r5 b / ^: T7 `. f: e7 [' n PI am sure . Would you gave me some advice? thanks!