richardzhng 发表于 2011-12-12 19:38 2 ?" s) E6 {7 W8 @( `! y4 Q+ t$ `
are 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?" ) W* l# y8 W% p0 | r3 @: P Q! Q) E& Z + q; {* O: @! r7 o9 G7 R, a# X% o" e
I am sure . Would you gave me some advice? thanks!