richardzhng 发表于 2011-12-12 19:38 + j0 Q. f W( L0 yare you sure it is three phases and one neutral, not three phases and a ground?
: i! V; z! n& }3 ]4 E7 V"are you sure it is three phases and one neutral, not three phases and a ground?" , W U6 L# Q7 a' f( b* w2 u& m* d/ A" ~7 X2 j& ?
b/ v4 Y M) U! L- _; F$ VI am sure . Would you gave me some advice? thanks!