封閉母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)（簡(jian)稱母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)）是由作(zuo)為(wei)保護(hu)殼(ke)的(de)金屬板（鋼板或鋁板）、導電(dian)條、絕(jue)緣(yuan)材(cai)料及(ji)相關(guan)附(fu)件組成(cheng)的(de)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)系統。可(ke)制成(cheng)間隔插入(ru)接線(xian)(xian)(xian)(xian)(xian)盒的(de)插入(ru)式(shi)(shi)封閉母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)，或中間不帶接線(xian)(xian)(xian)(xian)(xian)盒的(de)饋(kui)電(dian)式(shi)(shi)封閉母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)。在(zai)高層(ceng)建(jian)筑的(de)供(gong)電(dian)系統中，電(dian)源線(xian)(xian)(xian)(xian)(xian)和(he)照明線(xian)(xian)(xian)(xian)(xian)往(wang)往(wang)分開設置(zhi)(zhi)，母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)沿墻體(ti)垂直安裝(zhuang)在(zai)電(dian)氣豎井(jing)內(nei)作(zuo)為(wei)主供(gong)電(dian)線(xian)(xian)(xian)(xian)(xian)一(yi)(yi)次或多次。根(gen)據用途，母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)一(yi)(yi)般由起始母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)、直通(tong)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)（有千(qian)(qian)斤(jin)頂和(he)無千(qian)(qian)斤(jin)頂）、L型(xing)垂直（水(shui)平）彎通(tong)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)、Z型(xing)垂直（水(shui)平）偏(pian)(pian)置(zhi)(zhi)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)、 T型(xing)立(li)式(shi)(shi)（臥式(shi)(shi)）偏(pian)(pian)置(zhi)(zhi)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)、T型(xing)立(li)式(shi)(shi)（臥式(shi)(shi)）三通(tong)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)、X型(xing)立(li)式(shi)(shi)（臥式(shi)(shi)）四通(tong)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)、變容(rong)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)、擴展母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)、端子頭、接線(xian)(xian)(xian)(xian)(xian)盒、插件箱體(ti)、母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)相關(guan)配件及(ji)緊固(gu)裝(zhuang)置(zhi)(zhi)等。按絕(jue)緣(yuan)方式(shi)(shi)，母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)可(ke)分為(wei)空氣式(shi)(shi)插入(ru)式(shi)(shi)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)、密絕(jue)緣(yuan)插入(ru)式(shi)(shi)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)和(he)高強度插入(ru)式(shi)(shi)母(mu)(mu)(mu)(mu)(mu)線(xian)(xian)(xian)(xian)(xian)槽(cao)(cao)(cao)(cao)三種。

密集母(mu)線(xian)的(de)溫(wen)升(sheng)和受熱后(hou)的(de)膨脹變(bian)形對其(qi)性(xing)能和可(ke)靠(kao)性(xing)影響很大(da)，因為當母(mu)線(xian)本身的(de)溫(wen)度上升(sheng)到極限值時，會加速絕(jue)緣老化(hua)，甚(shen)至破壞(huai)絕(jue)緣，并且可(ke)能發生熱膨脹變(bian)形，直接(jie)(jie)影響密集母(mu)線(xian)的(de)使用壽命和相關設備的(de)可(ke)靠(kao)性(xing)。國標GB 7251《母(mu)線(xian)槽(cao)(cao)(cao)（母(mu)線(xian)槽(cao)(cao)(cao)系統(tong)）》規定，密集母(mu)線(xian)槽(cao)(cao)(cao)的(de)母(mu)線(xian)槽(cao)(cao)(cao)本體(ti)和母(mu)線(xian)槽(cao)(cao)(cao)連接(jie)(jie)處的(de)溫(wen)升(sheng)不得超(chao)過60℃。

密集母(mu)線(xian)(xian)槽進水如何(he)(he)處理：取決于(yu)母(mu)線(xian)(xian)槽的(de)防護(hu)等(deng)級(ji)。如果防護(hu)等(deng)級(ji)高，少(shao)量(liang)的(de)水不會對它(ta)造成太(tai)大(da)的(de)傷害。如果防護(hu)等(deng)級(ji)低，則必須(xu)將水清理干凈。使用，否則會出現短路。防護(hu)等(deng)級(ji)為IP，如：IP65 數字越大(da)，防塵防水越高。如果保護(hu)等(deng)級(ji)低，直接(jie)找廠家(jia)，測試(shi)各母(mu)線(xian)(xian)的(de)相(xiang)間電(dian)阻(zu)和相(xiang)與(yu)外殼之間的(de)電(dian)阻(zu)。如果任何(he)(he)部分(fen)不在(zai)指定范圍內，則必須(xu)全部替(ti)換(huan)。因(yin)為不容(rong)易(yi)曬干，估計更(geng)換(huan)價格是(shi)原母(mu)線(xian)(xian)槽。大(da)約是(shi)價格的(de)30%-40%。

集中(zhong)走(zou)線(xian)槽（CMC）的(de)(de)防潮、散熱效果(guo)較差。在(zai)耐濕(shi)性方面，母(mu)(mu)線(xian)在(zai)施(shi)工過(guo)程(cheng)中(zhong)容易受潮和滲水，導(dao)致相(xiang)間(jian)絕緣電(dian)阻下(xia)降。母(mu)(mu)線(xian)的(de)(de)散熱主要靠(kao)外殼。由(you)于線(xian)間(jian)布置和安裝緊湊，L2、L3相(xiang)的(de)(de)熱能散失緩(huan)慢，導(dao)致母(mu)(mu)線(xian)溫升(sheng)較高。密絕緣插(cha)入式(shi)母(mu)(mu)線(xian)槽受殼板限制，只(zhi)能產生不大(da)于3m的(de)(de)水平截面。由(you)于母(mu)(mu)線(xian)之間(jian)的(de)(de)氣隙很小(xiao)，當母(mu)(mu)線(xian)通過(guo)大(da)電(dian)流時，會產生強大(da)的(de)(de)電(dian)力，使磁振蕩頻率形成疊加狀(zhuang)態，導(dao)致噪聲過(guo)大(da)。插(cha)入式(shi)母(mu)(mu)線(xian)槽為(wei)樹干系統，具有體積小(xiao)、結構緊湊、運行可靠(kao)、傳輸電(dian)流大(da)、分接饋電(dian)方便、維護方便、能耗低、動熱穩定性好(hao)等(deng)優點。廣(guang)泛應用于高層建筑。廣(guang)泛使用。