The difference between flame retardant cable, halogen-free cable and fire resistant cable：
The flame-retardant cable is characterized by delaying the spread of the flame along the cable so that the fire does not expand. Whether it is a single cable or a bundle of laying conditions, the cable can control the spread of the flame within a certain range when burning, so it can avoid major disasters caused by the fire spreading. Thereby improving the fire prevention level of the cable line. Commonly used flame retardant materials include flame retardant tape, flame retardant filler rope and PVC or PE material containing flame retardant additives.
The characteristics of the halogen-free low-smoke flame retardant cable are not only that it has good flame retardant performance, but also that the material constituting the low-smoke halogen-free cable does not contain halogen, the corrosion and toxicity of the combustion is low, and the smoke is produced in a very small amount, thus reducing the damage to the person, instruments and equipment, and making timely rescue easier in the event of a fire. Its commonly used materials are low smoke halogen-free (LSZH) material and halogen-free flame retardant tape.
Fire-resistant cables can maintain normal operation for a certain time in the case of flame combustion to ensure the integrity of the line. The amount of acid gas and smoke produced during fire retardant cable combustion is less, and the fire retardant performance is greatly improved. Especially in the case of combustion accompanied by water spray and mechanical impact, the cable can still maintain the complete operation of the line. Refractory cables mainly use high-temperature refractory materials such as phlogopa tape and synthetic mica tape.
1.What is flame retardant cable?
Flame retardant cable refers to: under specified test conditions, the sample is burned, after removing the test fire source, the spread of the flame is only within a limited range, and the residual flame or residual burn can the cable can self-extinguish within a limited time.
Its basic characteristics are: in the case of fire, it may be burned and cannot run, but it can prevent the spread of the fire. In popular terms, once the cable is on fire, it can limit the combustion to a local scope, do not spread, protect other equipment, and avoid causing greater losses.
2. Structure characteristics of flame retardant cable.
The structure of the flame-retardant cable is basically the same as that of the ordinary cable, the difference is that its insulation layer, sheath, outer sheath and auxiliary materials (such as tape and filling materials) are completely or partially made of flame-retardant materials.
Commonly used materials include flame retardant PVC (for general flame retardant scenarios), halogenated or halogen-free flame retardant tape (for places with high environmental requirements), and high-performance ceramic silicone rubber materials (for high-end scenarios that require both flame retardant and fire resistance). In addition, helps round the cable structure and prevents flame spread along gaps, thereby improving the overall flame retardant performance.
3. What is fire-resistant cable?
Fire-resistant cable refers to: under specified test conditions, the sample is burned in the flame, and the can still maintain normal operation for a certain period of time.
Its fundamental characteristic is that the cable can still maintain the normal operation of the line for a period of time under the burning condition. Generally speaking, in case of fire, the cable will not burn at once, and the circuit is safer.
4. Structural characteristics of refractory cable.
The structure of the fire-resistant cable is basically the same as that of the ordinary cable, the difference is that the conductor uses the copper conductor with good fire resistance (the melting point of copper is 1083℃), and the fire-resistant layer is added between the conductor and the insulation layer.
The refractory layer is typically wrapped with multiple layers of phlogopite or synthetic mica tape. The high temperature resistance of different mica belts varies greatly, so the selection of mica belts is the key factor affecting the fire resistance.
The main difference between fire-resistant cable and flame-retardant cable:
Fire-resistant cables can maintain normal power supply for a period of time in the event of a fire, while fire-retardant cables do not have this feature.
Because fire-resistant cables can maintain the operation of key circuits during a fire, they play a particularly important role in modern urban and industrial buildings. They are often used in power supply circuits connecting emergency power sources to fire protection equipment, fire alarm systems, ventilation and smoke exhaust equipment, guiding lights, emergency power sockets, and emergency elevators.
Post time: Dec-11-2024