richardzhng 发表于 2011-12-12 19:38 $ g4 C5 I7 P& Pare 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?" - x' O; i; W! I" S) Z; S4 g5 U2 ^. t8 h) f2 G v- n
+ }# b( h* y6 q, d/ y6 SI am sure . Would you gave me some advice? thanks!