richardzhng 发表于 2011-12-12 19:38 & k/ e- J: ?/ R" }! Y0 pare 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 {( Q/ ?/ Q& c0 l% w; {6 C0 H0 k0 \6 j# ^
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I am sure . Would you gave me some advice? thanks!