richardzhng 发表于 2011-12-12 19:38 " _# `0 N; ~( Dare 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?" - i. u+ g: ]7 l4 ^1 Q- q" e 1 B3 G0 P6 t( u/ I6 u! M7 `( y) G8 q( H" U& Q H; v
I am sure . Would you gave me some advice? thanks!