richardzhng 发表于 2011-12-12 19:38 9 z1 g3 M; o6 q" m$ h3 F
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?" # O' @0 J5 w4 k }! L" O % U) O: F2 }" A3 ?. t, b 9 c4 l+ v! p* h: ^I am sure . Would you gave me some advice? thanks!