一、导体直流电阻超标。电线(xian)(xian)(xian)电缆(lan)的(de)(de)铜(tong)(tong)导线(xian)(xian)(xian)应(ying)该使(shi)用高纯度(du)电解(jie)铜(tong)(tong)，这样(yang)的(de)(de)材料(liao)(liao)拉出来的(de)(de)丝均匀且有光泽。有些(xie)生产企业(ye)为获取高额利润使(shi)用再生铜(tong)(tong)，或偷(tou)工(gong)减料(liao)(liao)减少铜(tong)(tong)线(xian)(xian)(xian)面积，导致电线(xian)(xian)(xian)的(de)(de)导体电阻严(yan)重超标，导线(xian)(xian)(xian)载流量(liang)大打(da)折(zhe)扣，使(shi)用时导体过热，影响(xiang)了电线(xian)(xian)(xian)的(de)(de)使(shi)用寿命，产生安全隐患。

　　二、绝(jue)缘和(he)护套材料的(de)机械(xie)性能（抗(kang)张强度、断裂伸长率）指标不合格。部分(fen)电(dian)线电(dian)缆的(de)绝(jue)缘和(he)护套材料使(shi)(shi)用(yong)再生塑料，其抗(kang)张强度和(he)断裂伸长率无法达(da)到使(shi)(shi)用(yong)要求。这种电(dian)缆在受力(li)过(guo)程中易断裂，致使(shi)(shi)带电(dian)导体裸露(lu)，造成短路和(he)漏放电(dian)。

　　三(san)、高压电缆绝缘热延(yan)伸(shen)项目(mu)不合格(ge)。个(ge)别产(chan)品的绝缘热延(yan)伸(shen)出现了熔断现象，在高温情况下易造(zao)成短路事故。

　　据万瑞通电缆质(zhi)(zhi)(zhi)检(jian)(jian)(jian)部工(gong)作人员介绍(shao)，首先(xian)，不要选(xuan)择(ze)价(jia)格(ge)(ge)过低(di)的(de)(de)(de)电(dian)(dian)缆，成(cheng)品(pin)(pin)电(dian)(dian)缆的(de)(de)(de)价(jia)格(ge)(ge)不可(ke)能(neng)低(di)于成(cheng)本销(xiao)售(shou)。其次要考虑生产(chan)(chan)企(qi)业的(de)(de)(de)资(zi)质(zhi)(zhi)(zhi)。我国对电(dian)(dian)线电(dian)(dian)缆实行(xing)3C认证(zheng)(zheng)(zheng)，部分产(chan)(chan)品(pin)(pin)采(cai)取(qu)生产(chan)(chan)许(xu)可(ke)证(zheng)(zheng)(zheng)的(de)(de)(de)管理，无证(zheng)(zheng)(zheng)企(qi)业的(de)(de)(de)产(chan)(chan)品(pin)(pin)没有(you)(you)质(zhi)(zhi)(zhi)量保证(zheng)(zheng)(zheng)可(ke)言。购买电(dian)(dian)线时(shi)，尽可(ke)能(neng)地向销(xiao)售(shou)方索取(qu)产(chan)(chan)品(pin)(pin)检(jian)(jian)(jian)验报告。电(dian)(dian)线电(dian)(dian)缆的(de)(de)(de)质(zhi)(zhi)(zhi)量不可(ke)能(neng)凭肉眼判断，只(zhi)有(you)(you)通过检(jian)(jian)(jian)测(ce)才能(neng)判断其是否合格(ge)(ge)。