絕(jue)緣層的材料必須具有良好(hao)的電(dian)(dian)氣絕(jue)緣性(xing)能，主要表現為承受電(dian)(dian)壓的大(da)小。一般地講，同(tong)一質量的絕(jue)緣層愈(yu)厚(hou)，耐(nai)電(dian)(dian)壓也越高(gao)。引(yin)起電(dian)(dian)纜(lan)導體(ti)本身(shen)發熱，引(yin)起包覆導體(ti)的絕(jue)緣老(lao)化開(kai)裂，造(zao)成(cheng)供(gong)電(dian)(dian)線路漏(lou)電(dian)(dian)、短路，甚至造(zao)成(cheng)火災，危及(ji)人身(shen)、財產的安全。標(biao)準(zhun)對不(bu)同(tong)規格電(dian)(dian)纜(lan)的導體(ti)直流電(dian)(dian)阻值均有嚴(yan)格的規定(ding)，不(bu)得大(da)于標(biao)準(zhun)規定(ding)的值。WDZ電(dian)(dian)纜(lan)比(bi)WDZN電(dian)(dian)纜(lan)價格略低10~20%。這個看每家電(dian)(dian)纜(lan)廠工(gong)藝和成(cheng)本價格不(bu)一，綠(lv)寶電(dian)(dian)纜(lan)為您提供(gong)，安全的電(dian)(dian)線電(dian)(dian)纜(lan)。

引起(qi)電(dian)(dian)纜(lan)(lan)導體(ti)本身(shen)發熱(re)(re)，引起(qi)包覆(fu)導體(ti)的(de)(de)(de)(de)絕緣老化(hua)開裂，低(di)壓電(dian)(dian)力電(dian)(dian)纜(lan)(lan)，造成供電(dian)(dian)線路(lu)漏電(dian)(dian)、短路(lu)，甚至(zhi)造成火災，危及人身(shen)、財產的(de)(de)(de)(de)安全。標(biao)準對不同(tong)規格電(dian)(dian)纜(lan)(lan)的(de)(de)(de)(de)導體(ti)直流電(dian)(dian)阻值(zhi)均有嚴格的(de)(de)(de)(de)規定，不得大(da)于標(biao)準規定的(de)(de)(de)(de)值(zhi)。為(wei)了檢驗(yan)(yan)是否漏焊，生產廠家又加了一項中間檢驗(yan)(yan)裝置，將整盤(pan)焊接后的(de)(de)(de)(de)電(dian)(dian)纜(lan)(lan)進行浸(jin)水氣密性(xing)(xing)試驗(yan)(yan)，且進行的(de)(de)(de)(de)檢驗(yan)(yan)。電(dian)(dian)纜(lan)(lan)通電(dian)(dian)以后，導體(ti)要(yao)發熱(re)(re)。因(yin)此(ci)，比較理想的(de)(de)(de)(de)絕緣材(cai)料(liao)，應(ying)有良好的(de)(de)(de)(de)絕緣性(xing)(xing)能，和良好的(de)(de)(de)(de)熱(re)(re)傳(chuan)導性(xing)(xing)能。絕緣在電(dian)(dian)和熱(re)(re)的(de)(de)(de)(de)作(zuo)用下，內部會產生變(bian)化(hua)，天長日久，絕緣性(xing)(xing)能就要(yao)降低(di)。

電(dian)(dian)(dian)(dian)纜(lan)(lan)就是利用導(dao)(dao)(dao)(dao)體來傳導(dao)(dao)(dao)(dao)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)，因而(er)電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)規(gui)格(ge)都以導(dao)(dao)(dao)(dao)體的(de)(de)截面(mian)表(biao)示(shi)。電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)導(dao)(dao)(dao)(dao)體，可以制成(cheng)整根(gen)實心的(de)(de)，或是由多根(gen)單線絞合而(er)成(cheng)，形(xing)狀可以是圓形(xing)的(de)(de)和(he)扇(shan)形(xing)的(de)(de)結構。引(yin)起(qi)電(dian)(dian)(dian)(dian)纜(lan)(lan)導(dao)(dao)(dao)(dao)體本身發(fa)熱(re)，引(yin)起(qi)包(bao)覆導(dao)(dao)(dao)(dao)體的(de)(de)絕(jue)緣老化開裂，造(zao)成(cheng)供電(dian)(dian)(dian)(dian)線路(lu)漏電(dian)(dian)(dian)(dian)、短路(lu)，甚至造(zao)成(cheng)火(huo)災，危及人身、財產的(de)(de)安全。標準(zhun)對(dui)不(bu)同規(gui)格(ge)電(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)導(dao)(dao)(dao)(dao)體直流(liu)電(dian)(dian)(dian)(dian)阻(zu)值均有嚴格(ge)的(de)(de)規(gui)定，不(bu)得大于標準(zhun)規(gui)定的(de)(de)值。導(dao)(dao)(dao)(dao)體是指能傳導(dao)(dao)(dao)(dao)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)物體，又(you)稱為導(dao)(dao)(dao)(dao)電(dian)(dian)(dian)(dian)線芯(xin)。用作(zuo)電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)纜(lan)(lan)導(dao)(dao)(dao)(dao)體的(de)(de)材料，首先要(yao)有良好的(de)(de)導(dao)(dao)(dao)(dao)電(dian)(dian)(dian)(dian)性能，即電(dian)(dian)(dian)(dian)阻(zu)要(yao)小，以減少電(dian)(dian)(dian)(dian)流(liu)在線路(lu)上(shang)(shang)的(de)(de)損(sun)耗(hao)。損(sun)耗(hao)與電(dian)(dian)(dian)(dian)流(liu)大小、電(dian)(dian)(dian)(dian)阻(zu)大小有直接(jie)關系，并表(biao)現(xian)在導(dao)(dao)(dao)(dao)體的(de)(de)發(fa)熱(re)上(shang)(shang)。