richardzhng 发表于 2011-12-12 19:38 " O! I8 I. Y% @9 B/ g+ Y# }( |( ^
are you sure it is three phases and one neutral, not three phases and a ground?
5 L/ f: m4 u) l. Q9 j"are you sure it is three phases and one neutral, not three phases and a ground?" " J; v5 K) Y* r9 T ' K8 ]2 x0 W5 ~ |% D4 F1 K$ Z2 a/ ~4 w1 |" \
I am sure . Would you gave me some advice? thanks!