電(dian)(dian)(dian)纜(lan)(lan)如(ru)果(guo)要(yao)長期存放，根據電(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)放置(zhi)位置(zhi)，應(ying)作以(yi)下(xia)考(kao)(kao)慮：1、屋檐下(xia)。電(dian)(dian)(dian)纜(lan)(lan)只在(zai)不直接(jie)(jie)暴露在(zai)陽光(guang)照射或超高溫(wen)下(xia)，電(dian)(dian)(dian)纜(lan)(lan)橋架(jia)價格，標準(zhun)局域網電(dian)(dian)(dian)纜(lan)(lan)就可以(yi)應(ying)用，建議使(shi)用管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)。2、外墻(qiang)上。避免陽光(guang)直接(jie)(jie)照射墻(qiang)面及人為損壞(huai)。3、管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)里(li)(塑料或金屬(shu)的(de)(de)(de))。如(ru)在(zai)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)里(li)，注意塑料管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)的(de)(de)(de)損壞(huai)及金屬(shu)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)的(de)(de)(de)導(dao)熱(re)。4、懸空應(ying)用/架(jia)空電(dian)(dian)(dian)纜(lan)(lan)。考(kao)(kao)慮電(dian)(dian)(dian)纜(lan)(lan)的(de)(de)(de)下(xia)垂和壓力(li)，打算采用哪種捆綁方式，電(dian)(dian)(dian)纜(lan)(lan)是否被陽光(guang)直接(jie)(jie)照射。5、直接(jie)(jie)在(zai)地下(xia)電(dian)(dian)(dian)纜(lan)(lan)溝(gou)中鋪設(she)，這種環境(jing)是控制(zhi)范圍1小的(de)(de)(de)。電(dian)(dian)(dian)纜(lan)(lan)溝(gou)的(de)(de)(de)安裝要(yao)定(ding)期進行干燥(zao)或潮濕程(cheng)度的(de)(de)(de)檢(jian)查。6、地下(xia)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)。為便于今后的(de)(de)(de)升級(ji)，耐高溫(wen)電(dian)(dian)(dian)纜(lan)(lan)生產(chan)廠(chang)家，電(dian)(dian)(dian)纜(lan)(lan)更換以(yi)及與表面壓力(li)和周圍環境(jing)隔離，輔(fu)設(she)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)相隔離，輔(fu)設(she)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)是一個較好(hao)的(de)(de)(de)方法(fa)。但(dan)不要(yao)寄希望于管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)會(hui)永遠保持(chi)干燥(zao)，這將影響(xiang)對電(dian)(dian)(dian)纜(lan)(lan)種類的(de)(de)(de)選(xuan)擇。

1kV及以下(xia)的(de)(de)(de)(de)(de)4芯(xin)(xin)(xin)電(dian)(dian)纜（3+1電(dian)(dian)纜），其(qi)中(zhong)的(de)(de)(de)(de)(de)第4芯(xin)(xin)(xin)除作為保(bao)(bao)護接地外，還(huan)要輸(shu)送電(dian)(dian)力系(xi)統(tong)在不平(ping)衡電(dian)(dian)流及短路(lu)電(dian)(dian)流。它的(de)(de)(de)(de)(de)大(da)小(xiao)(xiao)由不平(ping)衡電(dian)(dian)流及短路(lu)電(dian)(dian)流來確定，但(dan)一般不得小(xiao)(xiao)于相線(xian)的(de)(de)(de)(de)(de)1/2。1kV及其(qi)以下(xia)三(san)相四線(xian)制(zhi)低(di)壓配電(dian)(dian)系(xi)統(tong)，當(dang)保(bao)(bao)護線(xian)和中(zhong)性線(xian)合用(yong)(yong)同(tong)一導體時，應(ying)采用(yong)(yong)4芯(xin)(xin)(xin)電(dian)(dian)纜，電(dian)(dian)力電(dian)(dian)纜廠，而不得采用(yong)(yong)3芯(xin)(xin)(xin)電(dian)(dian)纜加單芯(xin)(xin)(xin)電(dian)(dian)纜組合成一回(hui)路(lu)的(de)(de)(de)(de)(de)方式，合肥電(dian)(dian)纜，甚至直接利(li)用(yong)(yong)3芯(xin)(xin)(xin)電(dian)(dian)纜的(de)(de)(de)(de)(de)金屬護套或(huo)鎧裝層等作中(zhong)性線(xian)的(de)(de)(de)(de)(de)方式。否(fou)則(ze)，當(dang)3相電(dian)(dian)流不平(ping)衡時，相當(dang)于單芯(xin)(xin)(xin)電(dian)(dian)纜的(de)(de)(de)(de)(de)運行狀(zhuang)態，容(rong)易引起工(gong)頻干擾。

而劣質(zhi)電(dian)線用(yong)手能撕下或掐(qia)下來一(yi)塊；5。看燃(ran)燒。按規定電(dian)線電(dian)纜的(de)(de)絕(jue)緣(yuan)層都(dou)具有一(yi)定的(de)(de)阻(zu)燃(ran)性(xing)。剝下一(yi)段絕(jue)緣(yuan)層，用(yong)打火(huo)機進行(xing)點燃(ran)，離開明火(huo)后能繼續自燃(ran)的(de)(de)是劣質(zhi)線。6。驗厚度。截取一(yi)段絕(jue)緣(yuan)層，看絕(jue)緣(yuan)層的(de)(de)斷面是否有肉眼可見的(de)(de)氣孔(kong)，其線芯是否位于絕(jue)緣(yuan)層的(de)(de)正(zheng)中(zhong)。不居中(zhong)的(de)(de)是因為工(gong)藝(yi)不高(gao)而造成的(de)(de)偏芯現(xian)象，有氣孔(kong)說明使用(yong)的(de)(de)絕(jue)緣(yuan)料不合格。