什么是阻燃電線電纜?和耐火電線電纜有什么區別?
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來源:金環宇電線發布日期:2020-03-31 14:44
1.阻燃電線電纜,
它的(de)阻(zu)燃是指(zhi)在(zai)電線(xian)(xian)電纜(lan)火(huo)(huo)災(zai)事故(gu)發生時(shi)(shi),能夠阻(zu)滯、推遲火(huo)(huo)焰沿(yan)著電線(xian)(xian)電纜(lan)的(de)擴散(san)和延(yan)伸,盡量減少電線(xian)(xian)電纜(lan)火(huo)(huo)災(zai)范圍擴展(zhan),該(gai)(gai)類型(xing)(xing)的(de)電纜(lan)具有著火(huo)(huo)后自熄的(de)特(te)性。大體可理解為該(gai)(gai)電線(xian)(xian)電纜(lan)產(chan)品(pin)在(zai)因(yin)自身著火(huo)(huo)或(huo)因(yin)外部熱源而自身著火(huo)(huo)時(shi)(shi),在(zai)火(huo)(huo)源平息后,電線(xian)(xian)電纜(lan)產(chan)品(pin)不再繼續燃燒,或(huo)燃燒時(shi)(shi)間(jian)很(hen)短等。在(zai)電線(xian)(xian)電纜(lan)類別中,常用符號-ZR來標明該(gai)(gai)類型(xing)(xing)。
同時,阻(zu)燃電線電纜(lan)分為(wei)無(wu)鹵阻(zu)燃電線電纜(lan)和含鹵阻(zu)燃電線電纜(lan)。無(wu)鹵相(xiang)對于含鹵阻(zu)燃電線電纜(lan),具有低毒、低煙的優(you)點。其產品型號表(biao)示為(wei)-WDZR。
2.耐火電線電纜
耐火電(dian)(dian)(dian)線電(dian)(dian)(dian)纜是指在電(dian)(dian)(dian)線電(dian)(dian)(dian)纜火災(zai)事故中,該電(dian)(dian)(dian)線電(dian)(dian)(dian)纜產品能夠在外部火焰依(yi)然燃燒的(de)(de)情況下,能夠堅持一定(ding)時間的(de)(de)正常運(yun)作,保持電(dian)(dian)(dian)線電(dian)(dian)(dian)纜線路完整性并保持線路設備的(de)(de)正常運(yun)轉的(de)(de)山東電(dian)(dian)(dian)線電(dian)(dian)(dian)纜廠家產品。
耐火電線電纜按國家標準可分為(wei)二個等級(ji):A級(ji)和(he)B級(ji)。通常表示為(wei)NHA類 以(yi)及NHB類。
判斷一個電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan)產品是否屬于(yu)耐(nai)火(huo)(huo)電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan),與(yu)電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan)產品自(zi)身(shen)是否具有自(zi)熄性(xing)(xing)無關。阻燃(ran)電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan)的最(zui)大功能在(zai)于(yu)電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan)產品自(zi)身(shen)的難(nan)燃(ran)性(xing)(xing)。耐(nai)火(huo)(huo)電(dian)(dian)線(xian)(xian)(xian)(xian)(xian)電(dian)(dian)纜(lan)(lan)通(tong)常(chang)能夠(gou)在(zai)750~800℃的火(huo)(huo)焰溫度下至少(shao)保持180分鐘(zhong)的正常(chang)運轉。
耐火電纜中還有一(yi)種特(te)殊(shu)的(de)特(te)種電(dian)纜(lan)(lan),稱(cheng)為防火電(dian)線(xian)(xian)電(dian)纜(lan)(lan)。它是(shi)以無縫銅(tong)管作(zuo)為護套,以氧化鎂做(zuo)為絕(jue)緣材料(liao)制造而成。因其材料(liao)的(de)特(te)殊(shu)性,防火電(dian)線(xian)(xian)電(dian)纜(lan)(lan)既不燃(ran)燒,也不延燃(ran)。經實驗表明:在800~900℃中2小時,防火電(dian)線(xian)(xian)電(dian)纜(lan)(lan)依然正常運(yun)作(zuo),在1000℃下30分(fen)鐘內依然持續(xu)正常運(yun)轉。
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