richardzhng 发表于 2011-12-12 19:38 3 r6 W. Y6 u; X4 l, [) w: ~
are 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 q- |: ]# `8 v4 K, W" U4 g3 A3 L6 \# Q& E4 X9 Y4 ]
2 S+ I0 W, \! U7 XI am sure . Would you gave me some advice? thanks!