richardzhng 发表于 2011-12-12 19:38 9 Z$ U' d/ L- T. M1 _% T% W j0 Q& n, z
are you sure it is three phases and one neutral, not three phases and a ground?
& m) b* T w/ p" f"are you sure it is three phases and one neutral, not three phases and a ground?" 8 ]1 @7 G2 n/ l, B" }, i * G' n, T/ J( {" U6 i8 Z" P$ m) u& E! G. s3 N
I am sure . Would you gave me some advice? thanks!