richardzhng 发表于 2011-12-12 19:38 ; s3 f1 R8 u, L0 c4 bare you sure it is three phases and one neutral, not three phases and a ground?
1 V0 W$ G' B2 z) e, F; H
"are you sure it is three phases and one neutral, not three phases and a ground?" ( ?2 F+ F' H6 l }, B: u: e " g, B B; O" F' A5 G, Z5 I5 i$ l: Z6 N* G
I am sure . Would you gave me some advice? thanks!