封閉式母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)（簡稱母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)）是由(you)金屬板（鋼(gang)板或(huo)鋁板）為(wei)保護外殼、導電(dian)排、絕(jue)(jue)(jue)緣材(cai)料及有關附(fu)件組成的(de)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)系(xi)統。它可(ke)(ke)制(zhi)成每(mei)隔一(yi)(yi)(yi)段距(ju)離設有插接分(fen)線(xian)(xian)(xian)(xian)(xian)(xian)盒的(de)插接型封閉母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)，也可(ke)(ke)制(zhi)成中(zhong)間不(bu)帶分(fen)線(xian)(xian)(xian)(xian)(xian)(xian)盒的(de)饋(kui)電(dian)型封閉式母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)。在高層建筑的(de)供(gong)電(dian)系(xi)統中(zhong)，動力和(he)照明(ming)線(xian)(xian)(xian)(xian)(xian)(xian)路(lu)往(wang)往(wang)分(fen)開(kai)設置(zhi)，母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)作為(wei)供(gong)電(dian)主干線(xian)(xian)(xian)(xian)(xian)(xian)在電(dian)氣(qi)豎井內沿墻(qiang)垂直安裝一(yi)(yi)(yi)趟(tang)或(huo)多趟(tang)。按用途(tu)一(yi)(yi)(yi)趟(tang)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)一(yi)(yi)(yi)般由(you)始端(duan)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)、直通(tong)(tong)(tong)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)（分(fen)帶插孔和(he)不(bu)帶插孔兩種）、L型垂直（水(shui)平）彎(wan)通(tong)(tong)(tong)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)、Z型垂直（水(shui)平）偏(pian)置(zhi)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)、T型垂直（水(shui)平）三通(tong)(tong)(tong)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)、X型垂直（水(shui)平）四通(tong)(tong)(tong)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)、變容(rong)母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)、膨脹母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)、終(zhong)(zhong)端(duan)封頭、終(zhong)(zhong)端(duan)接線(xian)(xian)(xian)(xian)(xian)(xian)箱(xiang)(xiang)、插接箱(xiang)(xiang)、母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)有關附(fu)件及緊固裝置(zhi)等組成。母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)按絕(jue)(jue)(jue)緣方式可(ke)(ke)分(fen)為(wei)空(kong)氣(qi)式插接母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)、密集(ji)絕(jue)(jue)(jue)緣插接母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)和(he)高強(qiang)度插接母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)三種。按其(qi)結(jie)構及用途(tu)分(fen)為(wei)密集(ji)絕(jue)(jue)(jue)緣、空(kong)氣(qi)絕(jue)(jue)(jue)緣、空(kong)氣(qi)附(fu)加絕(jue)(jue)(jue)緣、耐火、樹脂絕(jue)(jue)(jue)緣和(he)滑觸式母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)；按其(qi)外殼材(cai)料分(fen)為(wei)鋼(gang)外殼、鋁合金外殼和(he)鋼(gang)鋁混(hun)合外殼母(mu)線(xian)(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)(cao)。