封闭式(shi)母(mu)线(xian)(xian)(xian)(xian)(xian)槽(cao)简称母(mu)线(xian)(xian)(xian)(xian)(xian)槽(cao)，封闭式(shi)母(mu)线(xian)(xian)(xian)(xian)(xian)槽(cao)和母(mu)线(xian)(xian)(xian)(xian)(xian)槽(cao)指(zhi)的都是同(tong)一种东(dong)西。封闭式(shi)母(mu)线(xian)(xian)(xian)(xian)(xian)槽(cao)是由金属板(ban)（钢板(ban)或铝板(ban)）为保护(hu)外壳、导(dao)电(dian)排、绝(jue)缘材料(liao)及有(you)关附(fu)件组成的母(mu)线(xian)(xian)(xian)(xian)(xian)系(xi)统。它可(ke)制(zhi)成每隔(ge)一段距(ju)离设有(you)插接分线(xian)(xian)(xian)(xian)(xian)盒(he)的插接型(xing)封闭母(mu)线(xian)(xian)(xian)(xian)(xian)，也(ye)可(ke)制(zhi)成中间(jian)不(bu)带分线(xian)(xian)(xian)(xian)(xian)盒(he)的馈电(dian)型(xing)封闭式(shi)母(mu)线(xian)(xian)(xian)(xian)(xian)。