Test method for flexible fireproof performance of cables

Flexible fireproof cable means that the cable has certain fireproof performance and can maintain the continuity and reliability of power transmission in the event of a fire. In order to ensure that the flexible fireproof performance of the cable meets the requirements, corresponding performance tests are required. This article will introduce the method of cable flexible fire performance test and related precautions.

1. combustion performance test

The core of the flexible fire performance of the cable is the combustion performance. By testing the burning performance of the cable, the burning degree and burning speed of the cable under fire conditions can be evaluated, so as to judge whether its fire performance meets the requirements. Commonly used combustion performance test methods include vertical combustion test, horizontal combustion test and smoke density test.

1. Vertical burning test

The vertical burning test is to evaluate the burning performance of the cable in the vertical state. During the test, hang the cable vertically, ignite its lower end, and observe the burning. According to the burning time, burning length and burning speed and other indicators, evaluate the fire performance of the cable.

2. Horizontal combustion test

The horizontal combustion test is to evaluate the combustion performance of the cable in the horizontal state. During the test, place the cable horizontally, ignite one end and observe the burning. The fire performance of the cable is evaluated by measuring the burning length, burning speed and remaining length.

3. Smoke density test

The smoke density test is to evaluate the smoke density generated by the cable during combustion. During the test, the cable is placed in a closed combustion chamber, one end is ignited, and the smoke density generated during the combustion process is measured. The fire performance of the cable is judged by the evaluation of the smoke density value.

2. mechanical performance test

In addition to the burning performance, the cable flexible fire performance also includes mechanical properties. The mechanical performance test mainly evaluates the tensile, compressive and bending resistance of the cable under fire conditions. Through mechanical performance testing, it can be judged whether the cable can maintain its structural integrity and transmission function in the event of a fire.

1. Tensioned test

The tension test is to evaluate the cable's ability to resist tension under fire conditions. The tensile properties and breaking bearing capacity of the cable are measured by applying a certain tensile force during the test.

2. Compression test

The compression test is to evaluate the compression resistance of the cable under fire conditions. Apply a certain pressure during the test to observe the deformation and compressive properties of the cable.

3. Bending test

The bending test is to evaluate the ability of the cable to resist bending under fire conditions. During the test, a certain bending force is applied to observe the deformation and bending resistance of the cable.

In summary, the performance test methods for flexible fire protection of cables include combustion performance test and mechanical performance test. With these test methods, the fire performance of the cable can be fully evaluated to ensure that it can maintain reliable power transmission function in the event of a fire.