richardzhng 发表于 2011-12-12 19:38 ) W X0 g7 D Q7 C
are you sure it is three phases and one neutral, not three phases and a ground?
) W) B# V/ D0 [9 N4 a' R) s"are you sure it is three phases and one neutral, not three phases and a ground?" ( Y5 q! U' @4 }) x5 [/ e$ w6 j: p4 S
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I am sure . Would you gave me some advice? thanks!