耐火電線電纜的結(jie)構特點
耐(nai)火(huo)電(dian)(dian)線電(dian)(dian)纜(lan)(lan)的(de)(de)(de)結(jie)構和普(pu)通電(dian)(dian)線電(dian)(dian)纜(lan)(lan)基本相(xiang)同，不(bu)同之處在(zai)于(yu)耐(nai)火(huo)電(dian)(dian)線電(dian)(dian)纜(lan)(lan)的(de)(de)(de)導(dao)(dao)體采用耐(nai)火(huo)性(xing)能好(hao)的(de)(de)(de)銅(tong)(tong)導(dao)(dao)體(銅(tong)(tong)的(de)(de)(de)熔點為(wei)1 083℃)，并在(zai)導(dao)(dao)體和絕緣層間增加耐(nai)火(huo)層。耐(nai)火(huo)層由多層云母(mu)帶(dai)繞(rao)包(bao)而成。因(yin)為(wei)不(bu)同云母(mu)帶(dai)的(de)(de)(de)允許工作溫(wen)度(du)差(cha)異較大，因(yin)此電(dian)(dian)纜(lan)(lan)耐(nai)火(huo)性(xing)能的(de)(de)(de)關鍵是云母(mu)帶(dai)。
耐(nai)火電(dian)線電(dian)纜和阻燃電(dian)線電(dian)纜的主要區別
因此耐(nai)火(huo)電(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)纜與阻燃電(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)纜的(de)主要區(qu)別(bie)是：耐(nai)火(huo)電(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)纜在火(huo)災發生時(shi)能(neng)維持一段時(shi)間的(de)正(zheng)常供電(dian)(dian)(dian)(dian)，而(er)阻燃電(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)纜不具(ju)備這(zhe)個(ge)特(te)性。這(zhe)個(ge)特(te)性決定了耐(nai)火(huo)電(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)纜在現(xian)代都市及工業(ye)建筑中起著重要的(de)作(zuo)用。
因為一旦(dan)火災發生，控制、監(jian)視、導(dao)引及報(bao)警等系統供(gong)電(dian)(dian)回路(lu)(lu)必(bi)須維持正常工(gong)作(zuo)。因此，該(gai)電(dian)(dian)纜主要使用在應(ying)急電(dian)(dian)源(yuan)至用戶消防設備(bei)、火災報(bao)警設備(bei)、通風排煙設備(bei)、導(dao)行燈、緊急電(dian)(dian)源(yuan)插座、緊急用電(dian)(dian)梯(ti)等供(gong)電(dian)(dian)回路(lu)(lu)。
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