在电气工程领域，电缆桥架的防火性能直接关系到火灾蔓延风险与人员财产。判断其是否具备防火特性，需从标准认证、材料特性、检测报告及实际应用四方面综合评估。

　　In the field of electrical engineering, the fire resistance performance of cable trays is directly related to the risk of fire spread and the safety of personnel and property. To determine whether it has fire resistance characteristics, a comprehensive evaluation should be conducted from four aspects: standard certification, material characteristics, testing reports, and practical applications.

　　标准认证是首要依据

　　Standard certification is the primary basis

　　防火桥架需通过消防产品质量监督检验中心检测，符合GB 8624《建筑材料及制品燃烧性能分级》标准。其中，A级不燃材料与B1级难燃材料是核心指标，A级桥架在800℃火焰下持续燃烧时间为0，B1级则要求续燃时间≤5秒，且无燃烧滴落物。某检测机构数据显示，合规防火桥架在30分钟耐火试验中，背火面温度升幅仅85℃，远低于普通桥架的320℃。

　　Fireproof cable trays must pass the testing of the National Fire Product Quality Supervision and Inspection Center and comply with the GB 8624 "Classification of Burning Behavior of Building Materials and Products" standard. Among them, Class A non combustible materials and Class B1 non combustible materials are the core indicators. Class A bridge frames have a continuous combustion time of 0 under 800 ℃ flames, while Class B1 requires a continuous combustion time of ≤ 5 seconds and no combustion droplets. According to data from a testing agency, the temperature rise of the back fire surface of compliant fire-resistant cable trays during a 30 minute fire resistance test was only 85 ℃, far lower than the 320 ℃ rise of ordinary cable trays.

　　材料特性决定防火本质

　　The material properties determine the essence of fire prevention

　　钢制桥架需采用冷轧钢板，厚度≥1.5mm，表面涂覆防火涂料后，其氧指数可提升35%以上，形成炭化隔热层。铝合金桥架则通过添加镁硅合金元素，使熔点从660℃提升800℃，某产品实测显示，在1000℃火场中仍保持结构完整性。对于复合材料桥架，玻璃钢基材中需掺入20%阻燃剂，使垂直燃烧等级达到FV-0级，烟气毒性指数低于0.5。

　　Steel bridge frames should be made of cold-rolled steel plates with a thickness of ≥ 1.5mm. After surface coating with fireproof coating, their oxygen index can be increased to over 35%, forming a carbonized insulation layer. Aluminum alloy bridge frames are made by adding magnesium silicon alloy elements to increase their melting point from 660 ℃ to 800 ℃. A certain brand's product has been tested and shown to maintain structural integrity even in a 1000 ℃ fire scene. For composite cable trays, 20% flame retardant should be added to the fiberglass substrate to achieve a vertical combustion level of FV-0 and a smoke toxicity index below 0.5.

　　检测报告验证核心参数

　　Testing report verifies core parameters

　　关键检测数据包括：耐火极限≥90分钟、热辐射通量≤15kW/m²、烟密度等级≤50。某电厂项目采购时发现，标注“防火”的桥架实际耐火时间仅45分钟，经复检后退货。对于涂层类产品，需核查附着力测试结果，百格法检测应达到1级标准，即脱落面积＜5%。

　　The key detection data includes: fire resistance limit ≥ 90 minutes, heat radiation flux ≤ 15kW/m ², and smoke density level ≤ 50. During the procurement of a certain power plant project, it was found that the bridge frame labeled as "fireproof" had an actual fire resistance time of only 45 minutes. After re inspection, it was returned. For coating products, it is necessary to verify the adhesion test results, and the hundred grid method should meet the level 1 standard, that is, the peeling area should be less than 5%.

　　现场简易检测方法

　　Simple on-site testing method

　　采购环节可通过三步初判：

　　The procurement process can be preliminarily judged through three steps:

　　灼烧试验：用喷枪对准样片灼烧10秒，防火涂层应无明火且炭化层完整；

　　Burning test: Aim the spray gun at the sample and burn it for 10 seconds. The fireproof coating should have no open flame and the carbonized layer should be intact;

　　厚度测量：游标卡尺检测钢板基材厚度，误差应≤0.1mm；

　　Thickness measurement: Use a vernier caliper to measure the thickness of the steel plate substrate, with an error of ≤ 0.1mm;

　　密度测试：防火涂料密度需≥800kg/m³，浮于水面的产品可能掺入轻质填料。

　　Density test: The density of fireproof coating should be ≥ 800kg/m ³, and products floating on the water surface may be mixed with lightweight fillers.

　　判断电缆桥架防火性能需建立“标准认证-材料检测-报告核查-现场验证”四级体系。通过关注氧指数、耐火极限等核心参数，结合灼烧试验等简易手段，可有效甄别产品优劣。在消防要求严苛的场景中，建议委托第三方机构进行二次检测，确保防火设施发挥实效。

　　To determine the fire resistance performance of cable trays, a four level system of "standard certification material testing report verification on-site verification" needs to be established. By focusing on core parameters such as oxygen index and fire resistance limit, combined with simple methods such as burning tests, product quality can be effectively identified. In scenarios with strict fire safety requirements, it is recommended to commission a third-party organization to conduct secondary inspections to ensure the effectiveness of fire prevention facilities.

　　本文由济南电缆桥架友情奉献.更多有关的知识请点击  http://www.sdhangfeng.com   真诚的态度.为您提供为的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　This article is a friendly contribution from Jinan Cable Bridge For more related knowledge, please click http://www.sdhangfeng.com Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.山东电缆桥架