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Distinguish the two types of cables

source:Industry News     Popular:adapter     release time:2021-06-18 09:29:50     Article author:sznbone    

  In recent years, in the global power system fire accidents, the proportion of power system power supply interruptions caused by power cables on fire has been on the rise. Therefore, it is increasingly important to use flame-retardant cables to prevent fire from spreading in places where there are a large number of electrical equipment and densely laid large amounts of cables in power plants, substations, and so on. It is increasingly important to use flame-resistant cables to ensure uninterrupted power supply for important circuits. However, some electrical designers are not clear about the concept of flame-retardant cables and fire-resistant cables, and do not know much about the structure and characteristics of the two, which leads to the failure to correctly design and select these two cables according to the power supply requirements, and conduct design agency or supervision on site The laying workers of these two types of cables cannot be properly guided during work. Therefore, a comprehensive and correct understanding of flame-retardant and fire-resistant cables is the first condition for the correct selection of them.

Distinguish the two types of cables(图1)

  Flame retardant cable

  Flame-retardant cable refers to a cable whose sample is burned under specified test conditions, and after the test fire source is removed, the flame spreads only within a limited range, and the residual flame or residual burn can be extinguished by itself within a limited time. Flame-retardant cables are self-extinguishing while maintaining the electrical and physical and chemical properties of ordinary cables, that is, they are not easy to burn, or when the cable is on fire for some reason or an external source of fire ignites, the cable will not continue after the fire is extinguished. Burning, or the burning time is very short (within 60 minutes), or the extended burning length is very short.

  Features: In the event of a fire, it may be burned out and cannot be operated, but it can prevent the spread of the fire. In layman's terms, if the cable catches a fire, it can limit the combustion to a local area without spreading, and protect other equipment and avoid greater losses.

  Structural features: The structure of the flame-retardant cable is basically the same as that of the ordinary cable. The difference is that all or part of its insulating layer, sheath, outer sheath and auxiliary materials (banding and filling) are made of flame-retardant materials.

  Fire-resistant cable

  Fire-resistant cable refers to the operation that can maintain a certain period of time when the flame is burning, that is, to maintain the integrity of the circuit. This type of cable has a certain period of power supply capacity in the flame. When a fire occurs, it can continue to work (transmit current and signal), and whether it will continue to burn is not included in the assessment. The flame-retardant cable stops working quickly when a fire occurs, and its function is to be non-flammable and self-extinguishing without spreading. The fire-resistant cable maintains normal operation for 90 minutes while the flame is burning at 750~800℃.


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