richardzhng 发表于 2011-12-12 19:38 4 B3 c1 I6 j6 L R& r) U' m' c
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?" 5 x; b+ ^. x1 i4 k; H _8 M1 Q( n7 C+ d% C$ E# x' P' P
# V, d+ s$ u4 K; }# J+ VI am sure . Would you gave me some advice? thanks!