Flame-retardant wire means that the experimental circuit is in a burning state in a specified environmental environment. When the fire source is extinguished, the spread of the fire will be limited to the specified range, and the residual flame on the cable can be extinguished by itself within the specified time. The characteristic of the flame-retardant cable is that the cable in the fire environment will stop running due to being burned out, and it will also prevent the fire from spreading, and control the combustion range to a local extent to ensure the safety of other equipment and avoid further seriousness. s consequence.
How to test the flame retardant performance of the cable?
In fact, the flame-retardant wire does not look too different from the ordinary wire in appearance, and the relevant parameters and ZR characters are printed on the domestic standard flame-retardant cable. There are three main methods for testing the performance of flame-retardant wires.
1. Single cable does not burn test
Take a single cable, if you have the conditions, you can use a professional burner. If you don't have the equipment, you can also put the cable directly to the fire source to ignite. When the temperature of the fire source exceeds the ignition temperature, extinguish it for a few minutes. Source, if the flame on the cable is automatically extinguished, the cable is a qualified cable with flame retardant properties.
2. Material oxygen index test
Place a section of flame-retardant cable sample in the container, inject nitrogen into the container, then slowly inject oxygen, observe and record the change of oxygen content in the burning process of the cable sample in the container after ignition in the container under different oxygen content. This is also known as the material's oxygen index experiment.
3. Cable through hole fire test
This test method needs to be carried out with the help of professional tools. The flame retardant rating of the cable through-hole sealing material is different in the standard test methods specified in different countries. According to the standard temperature curve in the special heating furnace, the changing speed temperature acts on the plugging treatment method of the cable passing through the cable at one end of the sample cable. After waiting for 1-3h heating, it is judged by observing whether the connecting cable outside the heating furnace is intact. Flame resistant properties of flame retardant cable materials.