richardzhng 发表于 2011-12-12 19:38 ! m/ |$ U2 j$ f' Q0 A. Z' E
are you sure it is three phases and one neutral, not three phases and a ground?
. J% q2 l6 i! S* Q# _1 d3 ]) |' e
"are you sure it is three phases and one neutral, not three phases and a ground?"- W$ I) H% q" b. n9 g/ C
: Q; X! i0 \4 U! W# K' F- E- ?
, |& g0 ?, S Z* s( {
I am sure . Would you gave me some advice? thanks!