richardzhng 发表于 2011-12-12 19:38 ! i9 l+ x6 |$ j- n3 w/ J) k
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?"6 a8 \" u9 l( L$ H" c- S
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3 b) M7 b" p& _- l* [$ R/ G5 HI am sure . Would you gave me some advice? thanks!