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　　密(mi)集母線槽通(tong)(tong)常是測(ce)量外殼和穿芯螺栓的(de)溫升、進線箱的(de)接頭溫升等，電(dian)(dian)(dian)纜因(yin)其材料(liao)易于磨(mo)損、易老(lao)化、壽命較短等因(yin)素限(xian)制，需要定期進行檢查(cha)和維護，甚(shen)至更換。但凡是低壓線穿墻(qiang)敷設時，必需用穿墻(qiang)套(tao)管。穿墻(qiang)套(tao)管分(fen)室內(nei)和露天兩種，也部分(fen)叫戶內(nei)和戶外穿墻(qiang)套(tao)管。數據中心列頭柜(ju)形式(shi)(shi)的(de)供配電(dian)(dian)(dian)系統是典型的(de)放射式(shi)(shi)供配電(dian)(dian)(dian)系統,總配電(dian)(dian)(dian)柜(ju)直接供電(dian)(dian)(dian)給(gei)列頭柜(ju)與負(fu)載的(de)配電(dian)(dian)(dian)方式(shi)(shi)。優(you)點(dian)是各負(fu)荷獨(du)立(li)受電(dian)(dian)(dian),一旦發生故障只(zhi)局限(xian)于本身而(er)不影(ying)響其他回路,充分(fen)滿足現行規范(fan)對重(zhong)要用電(dian)(dian)(dian)負(fu)荷的(de)技術(shu)要求。缺(que)點(dian)是線路多、金屬導(dao)體消(xiao)耗(hao)量大(da)、施工復雜(za)。列頭柜(ju)通(tong)(tong)常以放射式(shi)(shi)的(de)配電(dian)(dian)(dian)形式(shi)(shi)連(lian)接到上游(you)配電(dian)(dian)(dian)柜(ju)或(huo)與采用樹干狀配電(dian)(dian)(dian)形式(shi)(shi)采用主干母線與上游(you)電(dian)(dian)(dian)源配電(dian)(dian)(dian)柜(ju)連(lian)接。