richardzhng 发表于 2011-12-12 19:38 & q# M" f+ m& Care you sure it is three phases and one neutral, not three phases and a ground?
1 O F1 c/ R; g3 K7 D"are you sure it is three phases and one neutral, not three phases and a ground?"3 d% q7 N" Y. h R/ R; R3 z
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I am sure . Would you gave me some advice? thanks!