richardzhng 发表于 2011-12-12 19:38 ( a. \$ c8 Y8 z9 D3 g* K7 x
are you sure it is three phases and one neutral, not three phases and a ground?
+ u( Z# H8 ]' J/ a# i"are you sure it is three phases and one neutral, not three phases and a ground?" ) q8 i8 i$ G& ^* g) m 6 O5 d* V. k( c; g% A h# D+ G5 `' r* }7 v6 e8 | D
I am sure . Would you gave me some advice? thanks!