richardzhng 发表于 2011-12-12 19:38 ; _/ i" a/ P: y' ~2 E m* M! Hare you sure it is three phases and one neutral, not three phases and a ground?
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"are you sure it is three phases and one neutral, not three phases and a ground?" 3 {: S9 L. k0 I1 F3 v& ` # g: W$ g& `/ a. }0 W0 _; I7 B6 l) P" D
I am sure . Would you gave me some advice? thanks!