richardzhng 发表于 2011-12-12 19:38 % l' o: G! V1 \' h4 \( J
are you sure it is three phases and one neutral, not three phases and a ground?
& @$ h# q- t' z"are you sure it is three phases and one neutral, not three phases and a ground?" p) H* Q5 i- a$ S/ n
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I am sure . Would you gave me some advice? thanks!