Views: 0 Author: Site Editor Publish Time: 2022-02-23 Origin: Site
Fireproof cable, that is, under the specified test conditions, the sample is burned, after the test fire source is removed, the spread of the flame is only within a limited range, and the residual flame or residual burning can be extinguished within a limited time. There is a chance that it will burn out and become inoperable, but it will prevent the spread of the fire. In layman's terms, in the event of a fire on the wire, the burning can be limited to a local area without spreading, and other various equipment can be protected to avoid greater losses. At present, the cable industry is accustomed to using flame retardant (Fire Retardant), halogen-free low smoke (Low Smoke Halogen Free, LSOH) or low halogen low smoke (Low Smoke Fume, LSF), fire resistance (Fire Resistant) and other cables with certain fire performance Collectively referred to as fire cables.
Fireproof cable classification
The characteristic of flame retardant cable is to delay the spread of flame along the cable so that the fire does not expand. Because of its low cost, it is a variety of cables widely used in fireproof cables. Whether it is a single cable or a bundled laying condition, when the cable is burned, the spread of the flame can be controlled within a certain range, so it can avoid major disasters caused by the fire and prolong the burning of the cable, thereby improving the fire protection level of the cable line. .
Halogen Free Low Smoke Flame Retardant Cable (LSOH)
The characteristics of halogen-free and low-smoke cables are that they not only have excellent flame retardant properties, but also the materials that constitute the low-smoke halogen-free cables do not contain halogens, so they have low corrosiveness and toxicity when burning, and produce a very small amount of smoke, thereby reducing the risk to the human body. , damage to instruments and equipment, is conducive to timely rescue in the event of a fire. Although halogen-free low-smoke flame-retardant cables have excellent flame retardancy, corrosion resistance and low smoke concentration, their mechanical and electrical properties are slightly worse than ordinary cables.
Low Halogen Low Smoke Flame Retardant Cable (LSF)
The hydrogen chloride emission and smoke concentration indicators of the low-halogen low-smoke flame-retardant cable are between those of the flame-retardant cable and the halogen-free low-smoke flame-retardant cable. Low halogen (Low Halogen) cables also contain halogens, but at lower levels. The characteristics of this cable are not only flame retardant properties, but also less smoke and hydrogen chloride released during combustion. This low-halogen low-smoke flame-retardant cable is generally made of polyvinyl chloride (PVC) as the base material, and then processed with high-efficiency flame retardant, HCL absorbent and smoke suppressant. Therefore, this flame retardant material significantly improves the combustion performance of common flame retardant polyvinyl chloride materials.
Fire-resistant cables can maintain normal operation for a certain period of time under the condition of flame burning, and can maintain the integrity of the circuit (Circuit Integrity). The fire-resistant and flame-retardant cable produces less acid gas smoke when it is burned, and the fire-resistant and flame-retardant performance is greatly improved, especially when it is burned, accompanied by water spray and mechanical shock and vibration, the cable can still maintain the complete operation of the line.
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