Views: 0 Author: Site Editor Publish Time: 2022-08-26 Origin: Site
At present, the cable industry is accustomed to collectively refer to cables with certain fire resistance, such as flame retardant, halogen-free low-smoke, low-halogen low-smoke, and fire resistance, as fire-resistant cables.
Flame retardant cable
The feature of flame retardant cable is to delay the spread of flame along the cable so that the fire will not expand. Because of its low cost, it is a cable variety that is widely used in fireproof cables. Whether it is a single cable or laid in bundles, when the cable is burned, the flame spread can be controlled within a certain range, so it can avoid major disasters caused by cable fire and prolong combustion, thereby improving the fire protection level of the cable line. .
Halogen Free Low Smoke Flame Retardant Cable
The characteristics of halogen-free low-smoke cables are that they not only have excellent flame retardant properties, but also the materials constituting the low-smoke halogen-free cables do not contain halogens, so they have low corrosion and toxicity during combustion, and produce a very small amount of smoke, thus reducing the damage to the human body and equipment. As well as equipment damage, it 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
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. The material of low halogen cable also contains halogen, but the content is lower.
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 cable
Fire-resistant cables can maintain normal operation for a certain period of time under the condition of flame combustion, and can maintain the integrity of the line. When the fire-resistant and flame-retardant cable is burned, the amount of acid gas smoke is small, and the fire-resistant and flame-retardant performance is greatly improved. Especially when it is burned, the cable can still maintain the complete operation of the line with water spray and mechanical shock and vibration.
Flame retardant cable standards and grades
The main technical indicators of cables involved in fire safety are the flame retardancy of CO2 cables, the density of smoke and the toxicity of gas. US fire protection standards focus more on the first two issues, but Europe and the US have completely different views on fire.
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