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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 ]
小蜜蜂
你讓我滾，我滾了。你讓我回來(lái)，對不起，滾遠了...
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1樓  發(fā)表于: 2009-07-28 22:06
這個(gè)太簡(jiǎn)單了，因為相線(xiàn)只承受1相的電流，而零線(xiàn)可能承受2相或3相的電流，換句說(shuō)有2相或3相的電流要經(jīng)過(guò)零線(xiàn)！
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