richardzhng 发表于 2011-12-12 19:38 9 M9 t- m" F. j. R
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?" 9 V1 w1 w! ]6 B# m & C7 L% f' W8 L1 r. _) u9 X( X- t7 D2 r. _3 E' q3 _
I am sure . Would you gave me some advice? thanks!