richardzhng 发表于 2011-12-12 19:38 0 l% c/ n5 k+ M R9 a/ Z* x
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?" 8 T% q9 ]" I2 P6 n1 s* P: y) o! @+ a( \5 b3 @
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I am sure . Would you gave me some advice? thanks!