richardzhng 发表于 2011-12-12 19:38 ( E' M) {) o9 D. P- \9 P7 T
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?" . R% E5 n# i* u# |( W8 d+ s' A7 ?/ l' ]* F& Y9 S( Y3 C
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I am sure . Would you gave me some advice? thanks!