richardzhng 发表于 2011-12-12 19:38 9 i n4 B- i& ?0 O; A* Fare you sure it is three phases and one neutral, not three phases and a ground?
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"are you sure it is three phases and one neutral, not three phases and a ground?" 4 l c1 `1 i9 L0 L d6 J$ |% V% F U! B, J/ G0 w1 s6 x
! @# P- `& l! `& Z6 AI am sure . Would you gave me some advice? thanks!