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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 ]
chenpingyg
機械是柱石,電氣是靈魂.
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1樓  發(fā)表于: 2009-07-31 19:30
因為宿舍樓一般都是單相負載，而零線(xiàn)是公用線(xiàn)，每一條流過(guò)相線(xiàn)的電流最后都要流到零線(xiàn)上去，零線(xiàn)要承受三跟相線(xiàn)電流的總和，所以零線(xiàn)要粗點(diǎn)。
自己的事情自己做.

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