richardzhng 发表于 2011-12-12 19:38 0 ~! n4 u9 Z; m6 t& k! R, Z; ~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?" 1 s$ f* `7 f8 K& @ + }$ i! i ~& m! n 4 |" L0 Y) `* l6 M0 nI am sure . Would you gave me some advice? thanks!