richardzhng 发表于 2011-12-12 19:38 ) \9 g- o1 F! s$ oare 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?" ( [# l, s; V* z) o7 Z4 v. D8 W9 t% a9 c8 }/ k- ?. g2 F
( m; A' l; k& y' c$ Q* g7 SI am sure . Would you gave me some advice? thanks!