richardzhng 发表于 2011-12-12 19:38 , R4 \2 n2 y5 m" ~/ V
are you sure it is three phases and one neutral, not three phases and a ground?
& { A8 a1 n' L0 B& [2 V"are you sure it is three phases and one neutral, not three phases and a ground?" 0 g/ t( Q4 @ }6 {+ [! O7 [3 {8 f7 B. j E1 g3 A3 v
7 K/ M" W% R4 m/ {I am sure . Would you gave me some advice? thanks!