電纜橋架防火規(guī)范的測(cè)試方法主要包括以下幾種：

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

外觀檢查：用目視檢查和手感檢查的方式，查看橋架表面有無裂紋、變形、銹蝕、劃傷等缺陷，尤其要注意防火涂層是否有脫落、起皮、起泡等情況，以及橋架連接處是否緊密，連接螺栓有無松動(dòng)，連接處的密封膠條是否完好。

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.

尺寸與厚度測(cè)量：使用卡尺、千分尺等工具測(cè)量電纜橋架的尺寸，確保尺寸精度符合標(biāo)準(zhǔn)。采用厚度測(cè)量儀測(cè)量橋架板材厚度以及防火涂層厚度，保證其滿足設(shè)計(jì)要求和相關(guān)標(biāo)準(zhǔn)。不同類型的防火電纜橋架對(duì)防火涂層厚度有相應(yīng)規(guī)定，如涂層厚度一般應(yīng)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.

機(jī)械性能測(cè)試：包括撞擊試驗(yàn)和機(jī)械載荷試驗(yàn)。撞擊試驗(yàn)是使用撞擊試驗(yàn)機(jī)模擬實(shí)際工況，評(píng)估電纜橋架在受到撞擊時(shí)的抗沖擊能力和結(jié)構(gòu)穩(wěn)定性，要求橋架經(jīng)撞擊試驗(yàn)后不應(yīng)出現(xiàn)影響使用的變形和裂紋。機(jī)械載荷試驗(yàn)則是利用載荷試驗(yàn)機(jī)模擬實(shí)際負(fù)載，檢測(cè)電纜橋架在承受一定機(jī)械負(fù)載時(shí)的性能，要求橋架在承受工作載荷時(shí)，其相對(duì)撓度值≤10，卸載后不應(yīng)有明顯變形。

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.

表面防護(hù)層性能測(cè)試：通過涂層測(cè)厚儀測(cè)量表面防護(hù)層厚度，使用附著力測(cè)試儀進(jìn)行表面防護(hù)層附著力試驗(yàn)，以評(píng)估防護(hù)層在長期使用過程中是否會(huì)脫落；采用均勻性測(cè)試儀進(jìn)行表面防護(hù)層均勻性試驗(yàn)，確保防護(hù)層整體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.

耐火等級(jí)試驗(yàn)：這是電纜橋架防火規(guī)范測(cè)試的關(guān)鍵項(xiàng)目。試驗(yàn)在特定的耐火試驗(yàn)爐中進(jìn)行，需使?fàn)t內(nèi)少含有一個(gè)橋架接頭且有足夠的與實(shí)際使用情況相符的連接件，并確保實(shí)現(xiàn)四面受火。試驗(yàn)過程中，要嚴(yán)格按照標(biāo)準(zhǔn)時(shí)間 - 溫度曲線升溫，即（其中t為爐內(nèi)的平均溫度，單位為℃；

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 ℃;

為時(shí)間，單位為 min），同時(shí)控制爐內(nèi)壓力。試驗(yàn)開始后，按頻次要求及時(shí)對(duì)爐內(nèi)溫度及壓力進(jìn)行測(cè)量與記錄，隨時(shí)觀察 3A 熔斷器情況，當(dāng)橋架內(nèi)電纜泄漏電流達(dá)到 3A 時(shí)，表明該橋架已不能維持其內(nèi)部電纜繼續(xù)工作，喪失耐火能力，此時(shí)即為橋架的維持工作時(shí)間。若試驗(yàn)中橋架仍能維持其內(nèi)部電纜正常工作，但試驗(yàn)已達(dá)到預(yù)定的維持工作時(shí)間時(shí)，也可終止試驗(yàn)。

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，對(duì)于一些有條件的場所，還可定期委托機(jī)構(gòu)對(duì)防火電纜橋架進(jìn)行的防火性能檢測(cè)，確保其防火性能符合相關(guān)標(biāo)準(zhǔn)。

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.