richardzhng 发表于 2011-12-12 19:38 . F; G+ E4 G# q& G% N3 U9 B9 ^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?"( ]# I/ k' a- z R) l8 V) f
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I am sure . Would you gave me some advice? thanks!