richardzhng 发表于 2011-12-12 19:38 , f% j. m) i3 U: Y Y. rare 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?" 0 i% H% X+ E. `; x5 v& A4 A# A7 {+ h) o3 r) b0 H# W: f1 C
# L: [. x- o* |& g' E, `; R5 ?I am sure . Would you gave me some advice? thanks!