richardzhng 发表于 2011-12-12 19:38 , r5 _( ~+ f( s9 I! H; a) [) aare 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?" 2 g& Q1 F: @7 b/ K. a7 z/ s; y% [1 m5 ] 4 o3 P5 g" O6 p( Q# k4 ^- v' O/ q! G- f0 E
I am sure . Would you gave me some advice? thanks!