richardzhng 发表于 2011-12-12 19:38 - o# c) a$ s2 ]$ gare you sure it is three phases and one neutral, not three phases and a ground?
( q$ R8 u2 C, O. ~6 _4 C' A1 P"are you sure it is three phases and one neutral, not three phases and a ground?" H7 r O1 h: c2 @/ s0 ?" d4 V5 J- b! t# F
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I am sure . Would you gave me some advice? thanks!