richardzhng 发表于 2011-12-12 19:38 9 z B. a( V* U' m# p1 j7 Ware 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?") F. H' V: I9 y# {& o
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I am sure . Would you gave me some advice? thanks!