richardzhng 发表于 2011-12-12 19:38 u$ f9 Q# }; g
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?" & U3 Q8 P4 P6 \6 d ; p$ N' K+ {# @+ N( q+ Z( Q) u' i
I am sure . Would you gave me some advice? thanks!