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各類防火電纜的概念區別和敷設要求

來源:www.vanjashop.com         發布時間:2020-12-03 返回列表
各類防火電纜的概念區別和敷設要求
目前國家沒有防火電纜的相應國標定義,電纜行業習慣將阻燃電纜、耐火電纜、礦物絕緣類不燃性電纜等具有一定防火性能的電纜統稱為防火電纜。
阻燃電纜是具有規定阻燃性能(如阻燃特性、煙密度、煙氣毒性、耐腐蝕性)的電纜。
阻燃性能是指在規定試驗條件下,試樣被燃燒,在撤去火源后,火焰在試樣上的蔓延僅在限定范圍內并且自行熄滅的特性,即具有阻止或延緩火焰發生或蔓延的能力。
耐火電纜是具有規定的耐火性能(如線路完整性、煙密度、煙氣毒性、耐腐蝕性)的電纜。
耐火性能是指在規定的火源和時間下燃燒時能持續地在指定狀態下運行的能力,即保持線路完整性的能力。

礦物絕緣類不燃性電纜由銅芯、礦物絕緣材料、銅等金屬護套組成,除具有良好的導電性能、機械物理性能、耐火性能外,還具有良好的不燃性,這種電纜在火災條件下不僅能保證火災延續時間內的消防供電,還不會延燃,不產生煙霧。


下面,我們再對一下照規范要求,看看對這幾種電纜在消防線路中有什么敷設要求

一、根據《建筑設計防火規范》GB50016-2014的要求,消防配電線路應符合下列規定:
1、當采用阻燃電纜或耐火電纜并敷設在電纜井、溝內時,可不用穿金屬導管或采用封閉式金屬槽盒保護。
2、當采用礦物絕緣類不燃性電纜時,可直接明敷。
3、消防配電線路與其他配電線路敷設在同一電纜井、溝內時,應采用礦物絕緣類不燃性電纜。

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