電線
電纜
電(dian)(dian)(dian)纜(lan)與電(dian)(dian)(dian)線(xian)(xian)一(yi)般都由芯線(xian)(xian)、絕(jue)緣包皮和保護外(wai)皮三個組(zu)成部分組(zu)成。 “電(dian)(dian)(dian)線(xian)(xian)”和“電(dian)(dian)(dian)纜(lan)”并沒(mei)有嚴格的界限。通常(chang)將芯數少(shao)、產(chan)品(pin)直徑小(xiao)(xiao)、結構簡單的產(chan)品(pin)稱為(wei)電(dian)(dian)(dian)線(xian)(xian)，沒(mei)有絕(jue)緣的稱為(wei)裸電(dian)(dian)(dian)線(xian)(xian)，其他的稱為(wei)電(dian)(dian)(dian)纜(lan)；導體(ti)截面(mian)積較(jiao)大的(大于(yu)6平(ping)方毫米(mi))稱為(wei)大電(dian)(dian)(dian)線(xian)(xian)，較(jiao)小(xiao)(xiao)的(小(xiao)(xiao)于(yu)或等于(yu)6平(ping)方毫米(mi))稱為(wei)小(xiao)(xiao)電(dian)(dian)(dian)線(xian)(xian)。電(dian)(dian)(dian)纜(lan)一(yi)般有2層以上(shang)的絕(jue)緣，多數是多芯結構，繞在(zai)電(dian)(dian)(dian)纜(lan)盤上(shang)，長(chang)度一(yi)般大于(yu)100米(mi)。電(dian)(dian)(dian)線(xian)(xian)一(yi)般是單層絕(jue)緣，單芯，100米(mi)一(yi)卷，無(wu)線(xian)(xian)盤。
家中(zhong)哪些地方需(xu)(xu)要(yao)(yao)用到(dao)電(dian)纜？電(dian)話信號(hao)也需(xu)(xu)要(yao)(yao)電(dian)纜線、電(dian)力傳輸也需(xu)(xu)要(yao)(yao)電(dian)纜線、寬帶也需(xu)(xu)要(yao)(yao)電(dian)纜線等等很(hen)多都(dou)需(xu)(xu)要(yao)(yao)電(dian)纜線。此外電(dian)源線也有部份是用電(dian)纜做成(cheng)的。
注(zhu)：B（B）—第(di)(di)一個字(zi)母表(biao)示(shi)布線(xian)，第(di)(di)二個字(zi)母表(biao)示(shi)玻璃(li)絲(si)編制；V（V）—第(di)(di)一個字(zi)母表(biao)示(shi)聚乙(yi)烯（塑料）絕緣，第(di)(di)二個字(zi)母表(biao)示(shi)聚乙(yi)烯護套；L（L）—鋁，無L則表(biao)示(shi)銅(tong)；F（F）—復合(he)型(xing)；R—軟線(xian)；S—雙(shuang)絞；X—絕緣橡膠。
vv電纜和yjv電纜的區(qu)別
首先，產品的命名不同，所代表的含義也不同：YJV絕緣用的是交聯聚乙烯，而VV絕緣用的是聚氯乙烯。
其次，二者在(zai)生產設(she)備和工(gong)藝制造上也有區別的(de)：VV為(wei)(wei)塑力(li)(li)纜(lan)，YJV即交(jiao)聯(lian)電(dian)(dian)纜(lan)，其絕(jue)緣(yuan)(yuan)層性能優于塑力(li)(li)纜(lan)。YJV只(zhi)是在(zai)絕(jue)緣(yuan)(yuan)材料上做了交(jiao)聯(lian)處理提(ti)高(gao)(gao)了耐熱溫度(du)(du)(du)(du)(du),而(er) VV沒有。YJV電(dian)(dian)纜(lan)工(gong)作(zuo)溫度(du)(du)(du)(du)(du)達90度(du)(du)(du)(du)(du)，而(er)VV只(zhi)有70度(du)(du)(du)(du)(du)，同截面積YJV電(dian)(dian)纜(lan)載(zai)流量大。VV類(lei)電(dian)(dian)纜(lan)導體(ti)運(yun)行最(zui)高(gao)(gao)額(e)(e)定(ding)溫度(du)(du)(du)(du)(du)為(wei)(wei)攝(she)氏(shi)(shi)70度(du)(du)(du)(du)(du)，短(duan)路時(shi)（持續時(shi)間小于5秒）最(zui)高(gao)(gao)溫度(du)(du)(du)(du)(du)不(bu)超過攝(she)氏(shi)(shi)160度(du)(du)(du)(du)(du)。YJV類(lei)電(dian)(dian)纜(lan)導體(ti)運(yun)行最(zui)高(gao)(gao)額(e)(e)定(ding)溫度(du)(du)(du)(du)(du)為(wei)(wei)攝(she)氏(shi)(shi)90度(du)(du)(du)(du)(du)，短(duan)路時(shi)（持續時(shi)間小于5秒）最(zui)高(gao)(gao)溫度(du)(du)(du)(du)(du)不(bu)超過攝(she)氏(shi)(shi)250度(du)(du)(du)(du)(du)。YJV從(cong)長遠看(kan)比VV好(hao)（使(shi)用壽命長等），但比VV貴。從(cong)短(duan)路允許的(de)最(zui)高(gao)(gao)度(du)(du)(du)(du)(du)看(kan)：YJV為(wei)(wei)250度(du)(du)(du)(du)(du)，VV為(wei)(wei)160、140。從(cong)技術(shu)經濟指(zhi)標(biao)看(kan)，三芯(xin)的(de)YJV比VV電(dian)(dian)纜(lan)的(de)各項參數都要高(gao)(gao)。在(zai)民用建筑中推薦使(shi)用YJV，其載(zai)流量比VV的(de)大，更為(wei)(wei)主要的(de)是在(zai)電(dian)(dian)氣火災時(shi)，由(you)于其絕(jue)緣(yuan)(yuan)材料不(bu)含氯，燃燒時(shi)不(bu)會產生有毒氣體(ti)。
所以也(ye)就是(shi)說VV的(de)(de)環保(bao)性能差些。在民用(yong)，核電等(deng)領域VV已基本被YJV取代，但是(shi)在很多(duo)的(de)(de)工業(ye)企(qi)業(ye)，VV應(ying)用(yong)還是(shi)非常廣(guang)泛(fan)的(de)(de)，原(yuan)因是(shi)它的(de)(de)價格便宜。
