richardzhng 发表于 2011-12-12 19:38 * O; N) I, u3 R$ a
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?"/ _7 p8 q, ]! V, I) y, ^, H
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I am sure . Would you gave me some advice? thanks!