richardzhng 发表于 2011-12-12 19:38 & t1 ~5 W( a' N: q! ]7 r6 O) K# x
are you sure it is three phases and one neutral, not three phases and a ground?
- T" |0 b; Y: `4 O- x, d2 ]"are you sure it is three phases and one neutral, not three phases and a ground?" / G$ Q/ e5 D* M$ l- ^: F ! H8 n$ n7 s( M* U0 T) t6 ? r 1 D" p, J' ^2 v5 \% n3 r* T: LI am sure . Would you gave me some advice? thanks!