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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 ]
ai625
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1樓  發(fā)表于: 2009-07-29 21:58
三樓說(shuō)法是比較正確的   民用電是單項電  但在電表總表處大部分都配用三相四線(xiàn)制電表  其零線(xiàn)電流是流經(jīng)A  B C三相電流之和  所以零線(xiàn)截面積要至少 比火線(xiàn) 大一個(gè)等級的
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