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xiaobo2009
態(tài)度決定一切,細節決定完美
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樓主  發(fā)表于: 2011-07-15 12:14
那們大蝦能告訴我,50臺1.5匹的空調,總電纜多大,零線(xiàn)要用多大?
dujiang100
我是一只小小鳥(niǎo)
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1樓  發(fā)表于: 2011-07-15 17:10
如果是單相負荷,電流從火線(xiàn)進(jìn),零線(xiàn)出,那么零線(xiàn)和火線(xiàn)的電流是一樣的,所以零線(xiàn)要和火線(xiàn)一樣粗。當不同相得零線(xiàn)接到一起后,由于各相電流的方向在同一時(shí)刻是不一樣的,所以公共零線(xiàn)的電流不一定會(huì )比任意一根單相零線(xiàn)的電流大。如果三相負荷平衡,即性質(zhì)一樣,且大小一致時(shí),公共零線(xiàn)基本沒(méi)有電流或者電流很小。

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