richardzhng 发表于 2011-12-12 19:38 ) f& L' u. g: d$ Jare you sure it is three phases and one neutral, not three phases and a ground?
4 R" l, S9 z- @$ k1 w/ O"are you sure it is three phases and one neutral, not three phases and a ground?". S2 {% [5 D$ u) A% V
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I am sure . Would you gave me some advice? thanks!