richardzhng 发表于 2011-12-12 19:38 8 r+ `7 x1 G) ]/ g/ ~+ Dare 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?" : S7 q) f% v# w 2 p' B( i" j$ w. s% X- L6 e7 { L) q# ]4 k0 B
I am sure . Would you gave me some advice? thanks!