richardzhng 发表于 2011-12-12 19:38 1 t# @$ z; C) x, b0 {+ h
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?" ( R2 m8 n G1 T/ d0 t/ f9 H4 ]1 C3 H9 P7 U5 S; H
, M H' s. e, ?- }3 ?I am sure . Would you gave me some advice? thanks!