richardzhng 发表于 2011-12-12 19:38 + m& T( _8 f: @6 M8 J) o
are you sure it is three phases and one neutral, not three phases and a ground?
& K) J: {0 P) p! {& ]"are you sure it is three phases and one neutral, not three phases and a ground?" ( P7 d7 p4 J: _( z; h8 a- s" ` / l! K# `; M/ n" U) {: G6 k" [ ! H+ O* V9 ~/ D" ^% VI am sure . Would you gave me some advice? thanks!