richardzhng 发表于 2011-12-12 19:38 & V6 Z$ I% H6 ~0 {
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?"$ t) u0 s0 V3 c9 |4 q
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% i. l7 p) ^ Y- s* a& G- l+ f. jI am sure . Would you gave me some advice? thanks!