richardzhng 发表于 2011-12-12 19:38 ' }* f. z5 L( b- w( j2 L9 fare you sure it is three phases and one neutral, not three phases and a ground?
) W+ [, C- Y5 e$ W; B8 W( g
"are you sure it is three phases and one neutral, not three phases and a ground?" : V# [# E( z1 l7 k. g4 q: Q' [, i* \; O/ z; ]) H
- N3 g' k" Q) w5 n& }8 z. J* JI am sure . Would you gave me some advice? thanks!