richardzhng 发表于 2011-12-12 19:38 - P, T6 l, g$ L* Z8 u* Y, Sare 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?"7 C! F3 m* ]' q6 o0 T
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I am sure . Would you gave me some advice? thanks!