richardzhng 发表于 2011-12-12 19:38 8 |8 c* W3 m- r |$ q
are you sure it is three phases and one neutral, not three phases and a ground?
8 ^" s# a! u& @1 Z$ a: b"are you sure it is three phases and one neutral, not three phases and a ground?"( T/ D+ t0 | f. S
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I am sure . Would you gave me some advice? thanks!