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thor206400
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樓主  發(fā)表于: 2011-04-26 09:58
  三相 四線(xiàn) 主線(xiàn)路            當主開(kāi)關(guān)關(guān)斷時(shí)    什么情況下N線(xiàn)該斷開(kāi)  什么情況不需斷開(kāi)   請有大蝦們 賜教。。。。
艾禮富
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1樓  發(fā)表于: 2011-04-26 13:20
引用
引用第6樓lu831226于2011-04-26 13:07發(fā)表的  :
在斷電后,N線(xiàn)斷不斷開(kāi)沒(méi)有關(guān)系,但是上電運行中N線(xiàn)就絕對不能斷開(kāi)!

正解

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