三稱重量(liang)(liang)。質(zhi)量(liang)(liang)好的(de)電(dian)線(xian)(xian)電(dian)纜，電(dian)纜廠(chang)家(jia)排名，一般每100m重量(liang)(liang)都(dou)在規(gui)定(ding)的(de)重量(liang)(liang)范(fan)圍(wei)內。質(zhi)量(liang)(liang)差的(de)電(dian)線(xian)(xian)重量(liang)(liang)不足(zu)，要(yao)么長度不夠，要(yao)么電(dian)線(xian)(xian)銅(tong)(tong)芯(xin)雜質(zhi)過多(duo)。四比(bi)價(jia)格。購(gou)買(mai)時，要(yao)當(dang)心，別為商家(jia)標(biao)榜(bang)的(de)''沖昏了頭腦，終(zhong)上當(dang)受騙。五看(kan)銅(tong)(tong)質(zhi)。合格的(de)銅(tong)(tong)芯(xin)電(dian)線(xian)(xian)銅(tong)(tong)芯(xin)應該是紫(zi)紅色、有光澤、手感軟。而(er)的(de)銅(tong)(tong)芯(xin)線(xian)(xian)銅(tong)(tong)芯(xin)為紫(zi)黑色、偏(pian)黃或偏(pian)白，雜質(zhi)多(duo)，機械強(qiang)度差，韌(ren)性不佳，稍(shao)用力即會(hui)折斷，而(er)且電(dian)線(xian)(xian)內常(chang)有斷線(xian)(xian)現象。

而劣質電線用手能(neng)撕下(xia)或掐下(xia)來一塊；5。看(kan)燃燒。按規定(ding)電線電纜(lan)的(de)(de)絕(jue)(jue)緣(yuan)(yuan)層都具(ju)有一定(ding)的(de)(de)阻燃性。剝下(xia)一段(duan)絕(jue)(jue)緣(yuan)(yuan)層，電纜(lan)，用打(da)火機進行(xing)點(dian)燃，離開明火后能(neng)繼續自燃的(de)(de)是(shi)劣質線。6。驗厚(hou)度。截取一段(duan)絕(jue)(jue)緣(yuan)(yuan)層，看(kan)絕(jue)(jue)緣(yuan)(yuan)層的(de)(de)斷(duan)面是(shi)否(fou)有肉眼可見的(de)(de)氣孔，其線芯(xin)是(shi)否(fou)位于絕(jue)(jue)緣(yuan)(yuan)層的(de)(de)正中(zhong)。不(bu)居(ju)中(zhong)的(de)(de)是(shi)因為工(gong)藝不(bu)高而造成的(de)(de)偏(pian)芯(xin)現象(xiang)，有氣孔說(shuo)明使(shi)用的(de)(de)絕(jue)(jue)緣(yuan)(yuan)料不(bu)合格。

電(dian)(dian)(dian)線(xian)(xian)(xian)(xian)電(dian)(dian)(dian)纜因(yin)導(dao)線(xian)(xian)(xian)(xian)過載(zai)而(er)起(qi)火(huo)(huo)(huo)的(de)原因(yin)。過載(zai)使(shi)雙股(gu)導(dao)線(xian)(xian)(xian)(xian)間(jian)(jian)(jian)絕緣層(ceng)(ceng)破(po)壞引(yin)起(qi)短(duan)路(lu)，燒毀設備，引(yin)發(fa)(fa)火(huo)(huo)(huo)災。雙股(gu)導(dao)線(xian)(xian)(xian)(xian)靠其間(jian)(jian)(jian)絕緣層(ceng)(ceng)隔開，過載(zai)使(shi)絕緣層(ceng)(ceng)軟化(hua)破(po)壞，電(dian)(dian)(dian)線(xian)(xian)(xian)(xian)電(dian)(dian)(dian)纜批(pi)發(fa)(fa)廠家，從而(er)導(dao)致兩股(gu)導(dao)線(xian)(xian)(xian)(xian)直接接觸引(yin)起(qi)短(duan)路(lu)，燒損設備。同時(shi)短(duan)路(lu)瞬間(jian)(jian)(jian)大(da)(da)電(dian)(dian)(dian)流1產(chan)生(sheng)的(de)高(gao)溫(wen)(wen)使(shi)線(xian)(xian)(xian)(xian)路(lu)起(qi)火(huo)(huo)(huo)、熔斷，產(chan)生(sheng)的(de)熔珠落至可(ke)燃(ran)物(wu)(wu)引(yin)發(fa)(fa)火(huo)(huo)(huo)災。過載(zai)溫(wen)(wen)升(sheng)還(huan)(huan)能(neng)直接引(yin)燃(ran)附近(jin)可(ke)燃(ran)物(wu)(wu)。過載(zai)導(dao)線(xian)(xian)(xian)(xian)傳熱使(shi)附近(jin)可(ke)燃(ran)物(wu)(wu)溫(wen)(wen)度升(sheng)高(gao)，對附近(jin)燃(ran)點(dian)較低的(de)可(ke)燃(ran)物(wu)(wu)來講，將其引(yin)燃(ran)造成火(huo)(huo)(huo)災是有可(ke)能(neng)的(de)。在貯存物(wu)(wu)品(pin)的(de)庫(ku)房和使(shi)用(yong)易、可(ke)燃(ran)裝(zhuang)修的(de)建筑中(zhong)，這(zhe)種危(wei)險性(xing)尤(you)為突(tu)出。過載(zai)還(huan)(huan)使(shi)線(xian)(xian)(xian)(xian)路(lu)中(zhong)的(de)連接處(chu)在過熱的(de)條件下，這(zhe)加速了其氧(yang)化(hua)的(de)過程。氧(yang)化(hua)使(shi)連接點(dian)處(chu)產(chan)生(sheng)不易導(dao)電(dian)(dian)(dian)的(de)薄薄一層(ceng)(ceng)氧(yang)化(hua)膜，鋁合金電(dian)(dian)(dian)纜型號(hao)，氧(yang)化(hua)膜加大(da)(da)了接觸點(dian)間(jian)(jian)(jian)的(de)電(dian)(dian)(dian)阻，從而(er)產(chan)生(sheng)打火(huo)(huo)(huo)等現象，引(yin)起(qi)火(huo)(huo)(huo)災。