richardzhng 发表于 2011-12-12 19:38 ! W+ I4 e& y1 z, B! [) Q
are you sure it is three phases and one neutral, not three phases and a ground?
% }) ?7 D( S f, t6 e) U4 R; v# B"are you sure it is three phases and one neutral, not three phases and a ground?" $ S$ h! V( J# H$ U4 [" S& l 1 N+ ^, h g T c/ V! ~/ Y R3 ~% `3 W
I am sure . Would you gave me some advice? thanks!