richardzhng 发表于 2011-12-12 19:38 : l, K1 k: H* C$ I4 H% D% ^& Jare 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?", h3 ?7 q% X6 f+ `. e
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2 \( J5 H# }7 S8 H; A/ iI am sure . Would you gave me some advice? thanks!