richardzhng 发表于 2011-12-12 19:38 , @, K. {6 L& i- I* J
are 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?" U1 D+ n/ s0 p1 E% ]7 V5 \& R8 @( E/ `/ a
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I am sure . Would you gave me some advice? thanks!