richardzhng 发表于 2011-12-12 19:38 / w8 X) n" b' ^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?" ' @4 E& U6 B$ r+ L4 w$ d6 E$ u d! `$ d9 J/ D
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I am sure . Would you gave me some advice? thanks!