richardzhng 发表于 2011-12-12 19:38 0 \9 b- C) E2 S) i
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?"0 D/ C1 k8 w% N3 G7 H5 k) K9 u
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I am sure . Would you gave me some advice? thanks!