richardzhng 发表于 2011-12-12 19:38 2 [5 L0 T" P3 g6 I" j3 k, ~/ ~, j
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?" 3 c( X* |1 Y5 K2 t& |! j7 L# }0 { 5 c3 H$ u" O* |) C l a, s9 ^ , @6 v% P6 V2 @, Y7 w- BI am sure . Would you gave me some advice? thanks!