richardzhng 发表于 2011-12-12 19:38 / b# t; f7 I$ {3 f
are you sure it is three phases and one neutral, not three phases and a ground?
4 Q0 F. P4 e& q4 V"are you sure it is three phases and one neutral, not three phases and a ground?" % x i3 y' j3 Z _; h% F % D" J1 g3 @$ ^* m3 C8 E7 U# y: n- P) D! W% ?/ q. S" b# \
I am sure . Would you gave me some advice? thanks!