而劣(lie)質電(dian)(dian)線(xian)用(yong)手能撕(si)下(xia)或(huo)掐下(xia)來一塊；5。看(kan)(kan)燃燒。按規定(ding)電(dian)(dian)線(xian)電(dian)(dian)纜的(de)絕(jue)(jue)緣(yuan)(yuan)層都具有一定(ding)的(de)阻燃性。剝下(xia)一段絕(jue)(jue)緣(yuan)(yuan)層，用(yong)打火機(ji)進行點燃，高低壓電(dian)(dian)纜，離開明火后(hou)能繼(ji)續自燃的(de)是劣(lie)質線(xian)。6。驗厚度(du)。截取一段絕(jue)(jue)緣(yuan)(yuan)層，看(kan)(kan)絕(jue)(jue)緣(yuan)(yuan)層的(de)斷面是否有肉(rou)眼(yan)可見的(de)氣孔(kong)，耐火電(dian)(dian)線(xian)電(dian)(dian)纜，其線(xian)芯是否位于絕(jue)(jue)緣(yuan)(yuan)層的(de)正中。不(bu)居中的(de)是因為工藝不(bu)高而造成的(de)偏芯現象(xiang)，電(dian)(dian)纜橋(qiao)架報價，有氣孔(kong)說明使用(yong)的(de)絕(jue)(jue)緣(yuan)(yuan)料不(bu)合格。

電(dian)纜線路的(de)接(jie)地(di)(di)(di)(di)(di)有哪(na)些要求？1、當電(dian)纜在(zai)地(di)(di)(di)(di)(di)下敷設(she)時(shi)，其兩端(duan)均(jun)應接(jie)地(di)(di)(di)(di)(di)；2、低壓電(dian)纜除在(zai)特別危險(xian)的(de)場所（潮濕、腐蝕性(xing)氣(qi)體導(dao)電(dian)塵埃）需要接(jie)地(di)(di)(di)(di)(di)外其它環境均(jun)可(ke)不(bu)接(jie)地(di)(di)(di)(di)(di)；3、高壓電(dian)纜在(zai)任何(he)情況下都要接(jie)地(di)(di)(di)(di)(di)；4、金(jin)屬外皮與支架(jia)可(ke)不(bu)接(jie)地(di)(di)(di)(di)(di)，電(dian)纜外皮如果是非金(jin)屬材料如塑(su)料橡皮管(guan)以及電(dian)纜與支架(jia)間有絕緣層時(shi)其支架(jia)必須接(jie)地(di)(di)(di)(di)(di)；5、截(jie)面在(zai)16平方毫米及以下的(de)單(dan)芯電(dian)纜為消(xiao)除渦流(liu)外的(de)一(yi)端(duan)應進行接(jie)地(di)(di)(di)(di)(di)。

電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)放(fang)(fang)線過程(cheng)(cheng)破損(sun)部(bu)位具(ju)有隨機(ji)性，在(zai)一(yi)(yi)般的(de)(de)(de)城市和平(ping)原地區，此項工(gong)作比(bi)較好(hao)開展，但是在(zai)一(yi)(yi)些山區地帶，由于(yu)收到(dao)復(fu)雜地形的(de)(de)(de)影響，電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)的(de)(de)(de)修補工(gong)作其實(shi)是很艱難的(de)(de)(de)。因此要(yao)減少相應(ying)方面(mian)的(de)(de)(de)投入和快速解決問題(ti)，一(yi)(yi)個很關鍵的(de)(de)(de)問題(ti)是電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)敷設(she)過程(cheng)(cheng)人員的(de)(de)(de)配備(bei)數(shu)量必須足夠，電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)，而(er)且采用正規的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)敷設(she)設(she)備(bei)進(jin)行正規放(fang)(fang)線，避免和減少電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)放(fang)(fang)線過程(cheng)(cheng)中出(chu)現(xian)護(hu)套(tao)(tao)破損(sun)的(de)(de)(de)現(xian)象。電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)的(de)(de)(de)現(xian)場修補方面(mian)需要(yao)的(de)(de)(de)技術不是很高，電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)敷設(she)施(shi)工(gong)單位，在(zai)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)發生破損(sun)后，一(yi)(yi)定(ding)要(yao)在(zai)確認電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)內(nei)部(bu)沒有受到(dao)損(sun)傷(shang)的(de)(de)(de)前提下，然后在(zai)對電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)進(jin)行修補，否(fou)則電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)護(hu)套(tao)(tao)修補的(de)(de)(de)實(shi)際意義不大。