richardzhng 发表于 2011-12-12 19:38 $ W6 U! f. T) J8 S) ?9 t6 rare 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?" 8 S3 {/ ~ d2 V) V& A* s: k7 p5 G# D, J
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I am sure . Would you gave me some advice? thanks!