richardzhng 发表于 2011-12-12 19:38 % [; j( y* v: K" C) C4 T# j6 T
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?" ( b+ s. f- w1 o, w) B" J8 {/ U9 ~% P6 u Z
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I am sure . Would you gave me some advice? thanks!