richardzhng 发表于 2011-12-12 19:38 + O. K1 g" X5 G% O' |# Z; d" A7 e
are you sure it is three phases and one neutral, not three phases and a ground?
) q5 Q/ V* [. }5 f9 J# U/ @. a0 q"are you sure it is three phases and one neutral, not three phases and a ground?" * T) I/ y( t; S3 r8 ?( q3 t# [+ P1 ~ }8 N/ l
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I am sure . Would you gave me some advice? thanks!