diciembre 21, 2020
2149
The characteristics of flame-retardant cables can be seen from the name that it has fire-resistant characteristics. In fact, fire-resistant cables are what people call for such special cables. Fire prevention is an inaccurate description. Strictly speaking, it delays the spread of flame along the cable. The fire will not expand. The flame-retardant cable can control the flame within a certain range, whether it is single or bundled, which can effectively reduce the loss of the cable after a fire, and will not cause a large fire, causing a large number of people and property damage , Improve the fire protection level of the cable.
Halogen-free low-smoke flame-retardant cables have excellent flame-retardant properties, and this type of cable is also safe and environmentally friendly, does not contain halogen, does not release toxic gases when burned, and the amount of smoke generated is very low. Therefore, in some densely populated buildings, On construction sites, the use of low-smoke and halogen-free cables can effectively improve safety and facilitate the escape of personnel in the event of a fire.
Fire-resistant cable is different from flame-retardant cable. It can maintain normal operation for a period of time under the condition of flame burning. This can ensure normal operation and reduce loss in the event of a fire. The amount of acid gas smoke generated when fire-resistant cable is The combustion performance is greatly improved, especially in the case of combustion, accompanied by water spray and mechanical blow, the cable can still maintain the complete operation of the line.
Many people can’t distinguish between flame-retardant cables and fire-resistant cables. More people refer to the two collectively as fire-resistant cables. In fact, the two are still different in terms of fire-resistant characteristics. To distinguish them from the definition, flame-retardant cables refer to : Under the specified test conditions, the sample is burned. After the test fire source is removed, the flame spread is only within a limited range, and the residual flame or residual burn can be extinguished by itself within a limited time. Fire-resistant cable refers to: under the specified test conditions, the sample is burned in the flame and can still maintain the performance of normal operation for a certain period of time.
In the event of a fire, flame-retardant cables may be burnt out and stop running. However, its flame-retardant properties can effectively control the spread of fire and control the fire within a certain range. It can continue to work for a long time under burning conditions. Fire cables can maintain normal power supply for a period of time when a fire occurs, but flame retardant cables do not have this feature. This characteristic determines that fire-resistant cables play an important role in modern cities and industrial buildings. Because once a fire occurs, the power supply circuits of the control, monitoring, guidance and alarm systems must maintain normal operation. Therefore, the cable is mainly used for power supply circuits from emergency power supply to user fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guide lights, emergency power sockets, and emergency elevators.
