richardzhng 发表于 2011-12-12 19:38 / c+ r! l3 A l; Bare 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?"$ j+ v; ?" _, l) {
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9 l# E# }# g6 o7 b9 RI am sure . Would you gave me some advice? thanks!