richardzhng 发表于 2011-12-12 19:38 " c) K2 ?( i# M+ _$ D
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?") w. I! q0 W' w7 J: H
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I am sure . Would you gave me some advice? thanks!