在一條距離比較長的(de)(de)線(xian)路(lu)上有多根(gen)小面積電(dian)(dian)(dian)(dian)(dian)纜往往會造成電(dian)(dian)(dian)(dian)(dian)纜使(shi)用浪費，于是(shi)在出(chu)線(xian)到用電(dian)(dian)(dian)(dian)(dian)負(fu)荷中，往往使(shi)用主干大電(dian)(dian)(dian)(dian)(dian)纜出(chu)線(xian)，然后在接近(jin)負(fu)荷的(de)(de)時候，使(shi)用電(dian)(dian)(dian)(dian)(dian)纜分(fen)支箱(xiang)將主干電(dian)(dian)(dian)(dian)(dian)纜分(fen)成若干小面積，電(dian)(dian)(dian)(dian)(dian)纜，由小面積電(dian)(dian)(dian)(dian)(dian)纜接入負(fu)荷。這樣的(de)(de)接線(xian)方(fang)式廣泛(fan)用于城市電(dian)(dian)(dian)(dian)(dian)網中的(de)(de)路(lu)燈(deng)等供電(dian)(dian)(dian)(dian)(dian)、小用戶供電(dian)(dian)(dian)(dian)(dian)。

配(pei)(pei)電(dian)(dian)箱具有體積(ji)小、安裝簡便，技術(shu)性(xing)能特殊、位置固定(ding)，配(pei)(pei)置功能獨特、不受場地(di)限制，應(ying)用比較(jiao)普遍(bian)，操(cao)(cao)作穩(wen)定(ding)可靠，空間利用率高(gao)，占地(di)少且具有環保效應(ying)的(de)(de)特點(dian)。是(shi)指揮供電(dian)(dian)線(xian)路(lu)中(zhong)各種(zhong)元(yuan)器件(jian)合理分配(pei)(pei)電(dian)(dian)能的(de)(de)控(kong)制中(zhong)心，是(shi)可靠接納上端電(dian)(dian)源，正確饋(kui)出(chu)荷載電(dian)(dian)能的(de)(de)控(kong)制環節，也是(shi)獲取用戶對供電(dian)(dian)質量滿意與否的(de)(de)關鍵(jian)。提高(gao)動(dong)力配(pei)(pei)電(dian)(dian)箱的(de)(de)操(cao)(cao)作可靠性(xing)，是(shi)創優(you)質工程的(de)(de)目標。

配電箱的進出線選用低壓電纜，普洱開關柜電纜的選擇應符合技術要求。生產開關柜例如30kVA、50kVA變壓器的(de)(de)(de)配(pei)電箱(xiang)(xiang)的(de)(de)(de)進線(xian)使用(yong)VV22-35×4電纜(lan)，分路(lu)(lu)出線(xian)使用(yong)同(tong)規(gui)格的(de)(de)(de)VLV22-35×4電纜(lan)；80kVA、100kVA變壓器的(de)(de)(de)配(pei)電箱(xiang)(xiang)的(de)(de)(de)進線(xian)分別使用(yong)VV22-50×4、VV22-70×4電纜(lan)，分路(lu)(lu)出線(xian)分別使用(yong)VLV22-50×4、VLV22-70×4電纜(lan),其電纜(lan)與銅鋁(lv)接線(xian)鼻壓接后再用(yong)螺(luo)栓(shuan)與配(pei)電箱(xiang)(xiang)內接線(xian)樁頭連(lian)接。

指除安(an)(an)裝(zhuang)面外，其它所有側面都被(bei)封閉(bi)起來的一(yi)種低壓開(kai)關(guan)(guan)柜。這種柜子的開(kai)關(guan)(guan)、保護和(he)監測控(kong)制(zhi)等(deng)電氣元件，均(jun)安(an)(an)裝(zhuang)在(zai)一(yi)個用(yong)鋼或(huo)絕緣(yuan)材(cai)料制(zhi)成的封閉(bi)外殼內，可(ke)靠(kao)墻或(huo)離墻安(an)(an)裝(zhuang)。柜內每條(tiao)回路之間(jian)可(ke)以(yi)不加隔離措(cuo)施，也可(ke)以(yi)采用(yong)接(jie)地(di)的金屬板(ban)或(huo)絕緣(yuan)板(ban)進行隔離。通常門與主開(kai)關(guan)(guan)操作(zuo)有機械聯(lian)鎖。另外還有防護式臺(tai)型開(kai)關(guan)(guan)柜（即控(kong)制(zhi)臺(tai)）】面板(ban)上(shang)裝(zhuang)有控(kong)制(zhi)、測量、信號等(deng)電器。防護式開(kai)關(guan)(guan)柜主要(yao)用(yong)作(zuo)工藝現場的配(pei)電裝(zhuang)置。

1.了解用(yong)(yong)(yong)戶所需(xu),根據實(shi)際情(qing)況選(xuan)擇(ze)最適合用(yong)(yong)(yong)戶的柜(ju)型(xing)。2.盡量采用(yong)(yong)(yong)國(guo)內知名廠家的國(guo)產柜(ju)型(xing),不能盲目選(xuan)擇(ze)技術參(can)數(shu)比較高的進(jin)口(kou)(kou)配電柜(ju),這樣易(yi)造(zao)成資源浪費(fei)。3.由(you)于(yu)進(jin)口(kou)(kou)配電柜(ju)中所采用(yong)(yong)(yong)的主要(yao)元器件的品牌與柜(ju)體是一致的。所以(yi)選(xuan)擇(ze)進(jin)口(kou)(kou)配電柜(ju)時,應(ying)注意(yi)主要(yao)元器件的參(can)數(shu),它必(bi)須能滿足用(yong)(yong)(yong)戶需(xu)要(yao)。