而(er)劣質電線(xian)用手(shou)能(neng)撕(si)下或掐下來一塊(kuai)；5。看燃(ran)燒。按規定電線(xian)電纜(lan)的(de)絕(jue)緣(yuan)層(ceng)都具有(you)一定的(de)阻燃(ran)性。剝下一段(duan)(duan)絕(jue)緣(yuan)層(ceng)，用打火(huo)機進行點(dian)燃(ran)，離開(kai)明火(huo)后能(neng)繼續自燃(ran)的(de)是(shi)劣質線(xian)。6。驗厚度(du)。截取一段(duan)(duan)絕(jue)緣(yuan)層(ceng)，看絕(jue)緣(yuan)層(ceng)的(de)斷面是(shi)否有(you)肉(rou)眼可見的(de)氣(qi)孔，其線(xian)芯(xin)是(shi)否位于絕(jue)緣(yuan)層(ceng)的(de)正中。不居中的(de)是(shi)因為工(gong)藝(yi)不高而(er)造成的(de)偏芯(xin)現象，有(you)氣(qi)孔說明使用的(de)絕(jue)緣(yuan)料不合格。

電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)纜的(de)(de)區別電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)線是(shi)由(you)一根(gen)或(huo)(huo)幾根(gen)柔軟的(de)(de)導線組成，外面包以輕軟的(de)(de)護(hu)(hu)(hu)層，用于承載(zai)電(dian)(dian)(dian)(dian)流的(de)(de)導電(dian)(dian)(dian)(dian)金屬線材。有(you)實心的(de)(de)、絞合的(de)(de)或(huo)(huo)箔(bo)片編織的(de)(de)等(deng)各種形式。按(an)絕緣狀況分(fen)(fen)為裸電(dian)(dian)(dian)(dian)線和絕緣電(dian)(dian)(dian)(dian)線兩大類。電(dian)(dian)(dian)(dian)纜由(you)一根(gen)或(huo)(huo)多根(gen)相互絕緣的(de)(de)導電(dian)(dian)(dian)(dian)線心置(zhi)于密封護(hu)(hu)(hu)套(tao)中構(gou)成的(de)(de)絕緣導線。其外可加(jia)保(bao)護(hu)(hu)(hu)覆蓋層﹐用于傳輸、分(fen)(fen)配電(dian)(dian)(dian)(dian)能(neng)或(huo)(huo)傳送電(dian)(dian)(dian)(dian)信號。它與普通電(dian)(dian)(dian)(dian)線的(de)(de)差(cha)別主要是(shi)電(dian)(dian)(dian)(dian)纜尺寸較大，結構(gou)較復雜。電(dian)(dian)(dian)(dian)纜主要由(you)導電(dian)(dian)(dian)(dian)線心、絕緣層、密封護(hu)(hu)(hu)套(tao)以及保(bao)護(hu)(hu)(hu)覆蓋層四個部分(fen)(fen)組成。按(an)其用途可分(fen)(fen)為電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜﹑通信電(dian)(dian)(dian)(dian)纜和控制(zhi)電(dian)(dian)(dian)(dian)纜等(deng)。

焊(han)接(jie)塑(su)料時，注意焊(han)熱(re)風溫度不要太高，以免(mian)修補處塑(su)料焦燒。修好后的(de)缺陷處經火(huo)花(hua)機試(shi)驗，不擊(ji)穿為(wei)合(he)格。2。斷(duan)膠、裂紋(wen)、凹陷、口子(zi)(zi)等修補方法用(yong)刀在塑(su)料層缺陷部位割(ge)成45°角的(de)坡(po)形(xing)，去形(xing)狀(zhuang)、顏色、厚度一致的(de)塑(su)料塊(kuai)或(huo)條，綠寶電(dian)線電(dian)纜(lan)價格，用(yong)鉗子(zi)(zi)或(huo)螺絲刀固定好后，用(yong)熱(re)風速焊(han)接(jie)好，然后用(yong)銅片(pian)壓(ya)實、壓(ya)緊、壓(ya)平，后經火(huo)花(hua)機試(shi)驗，不擊(ji)穿為(wei)合(he)格。