richardzhng 发表于 2011-12-12 19:38 2 i- ?( I& L% D$ M: F# q$ h `9 l- c
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 R$ C0 G0 m) D6 e+ ]8 Z- Q3 k4 B8 ^
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I am sure . Would you gave me some advice? thanks!