电缆桥架防火规范的测试方法主要包括以下几种：

The testing methods for fire prevention regulations of cable trays mainly include the following:

外观检查：用目视检查和手感检查的方式，查看桥架表面有无裂纹、变形、锈蚀、划伤等缺陷，尤其要注意防火涂层是否有脱落、起皮、起泡等情况，以及桥架连接处是否紧密，连接螺栓有无松动，连接处的密封胶条是否完好。

Appearance inspection: Use visual inspection and tactile inspection to check for defects such as cracks, deformation, rust, scratches, etc. on the surface of the bridge, especially paying attention to whether the fireproof coating has peeled off, peeled off, foamed, etc., as well as whether the bridge connections are tight, whether the connecting bolts are loose, and whether the sealing strips at the connections are intact.

尺寸与厚度测量：使用卡尺、千分尺等工具测量电缆桥架的尺寸，确保尺寸精度符合标准。采用厚度测量仪测量桥架板材厚度以及防火涂层厚度，保证其满足设计要求和相关标准。不同类型的防火电缆桥架对防火涂层厚度有相应规定，如涂层厚度一般应不小于 60μm。

Measurement of Dimensions and Thickness: Use tools such as calipers and micrometers to measure the dimensions of cable trays, ensuring that the dimensional accuracy meets the standards. Use a thickness measuring instrument to measure the thickness of the bridge plate and the thickness of the fireproof coating, ensuring that they meet the design requirements and relevant standards. Different types of fire-resistant cable trays have corresponding regulations on the thickness of fire-resistant coatings, such as coating thickness should generally not be less than 60 μ m.

机械性能测试：包括撞击试验和机械载荷试验。撞击试验是使用撞击试验机模拟实际工况，评估电缆桥架在受到撞击时的抗冲击能力和结构稳定性，要求桥架经撞击试验后不应出现影响使用的变形和裂纹。机械载荷试验则是利用载荷试验机模拟实际负载，检测电缆桥架在承受一定机械负载时的性能，要求桥架在承受工作载荷时，其相对挠度值≤10，卸载后不应有明显变形。

Mechanical performance testing: including impact testing and mechanical load testing. Impact testing is the use of an impact testing machine to simulate actual working conditions, evaluate the impact resistance and structural stability of cable trays when subjected to impact, and require that the trays should not exhibit deformation or cracks that affect safe use after impact testing. Mechanical load testing is the use of a load testing machine to simulate actual loads and test the performance of cable trays under certain mechanical loads. It is required that the relative deflection value of the tray should be ≤ 10 when subjected to safe working loads, and there should be no significant deformation after unloading.

表面防护层性能测试：通过涂层测厚仪测量表面防护层厚度，使用附着力测试仪进行表面防护层附着力试验，以评估防护层在长期使用过程中是否会脱落；采用均匀性测试仪进行表面防护层均匀性试验，确保防护层整体防腐和耐火性能良好。

Surface protective layer performance testing: Measure the thickness of the surface protective layer using a coating thickness gauge, and conduct adhesion tests on the surface protective layer using an adhesion tester to evaluate whether the protective layer will peel off during long-term use; Use a uniformity tester to conduct uniformity tests on the surface protective layer, ensuring that the overall anti-corrosion and fire resistance performance of the protective layer is good.

耐火等级试验：这是电缆桥架防火规范测试的关键项目。试验在特定的耐火试验炉中进行，需使炉内少含有一个桥架接头且有足够的与实际使用情况相符的连接件，并确保实现四面受火。试验过程中，要严格按照标准时间 - 温度曲线升温，即（其中t为炉内的平均温度，单位为℃；

Fire resistance rating test: This is a key item in the fire protection specification testing of cable trays. The experiment is conducted in a specific fire-resistant testing furnace, which must have at least one bridge joint and sufficient connectors that match the actual usage situation, and ensure that all four sides are exposed to fire. During the experiment, the temperature should be strictly raised according to the standard time temperature curve, where t is the average temperature inside the furnace, measured in ℃;

为时间，单位为 min），同时控制炉内压力。试验开始后，按频次要求及时对炉内温度及压力进行测量与记录，随时观察 3A 熔断器情况，当桥架内电缆泄漏电流达到 3A 时，表明该桥架已不能维持其内部电缆继续工作，丧失耐火能力，此时即为桥架的维持工作时间。若试验中桥架仍能维持其内部电缆正常工作，但试验已达到预定的维持工作时间时，也可终止试验。

For time, in minutes, while controlling the pressure inside the furnace. After the experiment begins, the temperature and pressure inside the furnace should be measured and recorded in a timely manner according to the frequency requirements, and the condition of the 3A fuse should be observed at any time. When the leakage current of the cables in the bridge reaches 3A, it indicates that the bridge can no longer maintain its internal cables and lose its fire resistance ability. At this time, it is the maintenance working time of the bridge. If the bridge can still maintain the normal operation of its internal cables during the test, but the test has reached the predetermined maintenance time, the test can also be terminated.

此外，对于一些有条件的场所，还可定期委托机构对防火电缆桥架进行的防火性能检测，确保其防火性能符合相关标准。

In addition, for some places with conditions, professional organizations can be regularly commissioned to conduct comprehensive fire performance testing on fire-resistant cable trays to ensure that their fire performance meets relevant standards.