richardzhng 发表于 2011-12-12 19:38 ) ?5 M6 M$ N M7 T% g
are you sure it is three phases and one neutral, not three phases and a ground?
: O) D3 L8 K8 \& c) M M"are you sure it is three phases and one neutral, not three phases and a ground?") U+ R. B [7 f% F6 ?4 U7 s
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I am sure . Would you gave me some advice? thanks!