richardzhng 发表于 2011-12-12 19:38 1 g* [! L, X# F; ]4 ~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?"" `" M; H9 y' i1 ]0 Z# @0 C2 p) ~/ _, {
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! [( K$ D! \2 A' R4 L( ?: [I am sure . Would you gave me some advice? thanks!