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薛名海強
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樓主  發(fā)表于: 2009-07-28 21:36
各位大哥，我宿舍的三相四線(xiàn)，相線(xiàn)１５０mm2,為什么零線(xiàn)卻用２４０mm2��？
急！急！急！
[ 此帖被sjm213在2009-07-30 21:30重新編輯 ]
aabbcc296
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1樓  發(fā)表于: 2009-10-13 17:58
零線(xiàn)電流是不會(huì )超過(guò)相線(xiàn)的.我想設計著(zhù)的初衷是是這樣的:鑒于民用電零線(xiàn)的重要性.零線(xiàn)小于相線(xiàn)理論是行的,但在實(shí)際生活中,零線(xiàn)因線(xiàn)細,接頭過(guò)熱,不抗拉,接觸不好,斷線(xiàn)常有.當短路時(shí),斷路器設置再大,先燒壞的就是零線(xiàn).我見(jiàn)過(guò)3次,電SHI\燈\電扇很多家用電器都燒了.我的TV也燒了.
零線(xiàn)大于相線(xiàn)可靠性要高!

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