Fire-resistant cables are designed to maintain functionality even when exposed to fire, preventing immediate failure and ensuring continued operation of critical systems for a certain period. This makes them essential in modern urban and industrial environments, where maintaining power to control, monitoring, alarm, and guidance systems during emergencies is crucial. As a result, these cables have become widely adopted in buildings that prioritize safety and reliability.
Currently, fire-resistant cables are commonly used in emergency power supply systems for fire-fighting equipment, fire alarms, ventilation systems, smoke extraction units, emergency lighting, power outlets, and elevators. Their ability to function under extreme heat conditions ensures that vital operations can continue during a fire, giving people more time to evacuate and reducing the risk of further damage.
When installing fire-resistant cables, workers must pay close attention to several key factors. First, in areas with high cable density—such as tunnels, interlayers, or locations near flammable materials like oil pipes and depots—it's important to use Class A fire-resistant cables. If the environment is less hazardous and the number of cables is lower, Class B cables may be sufficient.
Second, since fire-resistant cables are often used in emergency power circuits, they need to operate reliably during fires. The temperature in such scenarios can rise rapidly, so it's necessary to ensure that the cable’s cross-sectional area is adequate to maintain power transmission efficiency and minimize voltage drop. For long-distance lines with strict voltage limits, the cable size should be increased by at least one step to guarantee performance.
Third, it's important to note that fire-resistant cables are not the same as high-temperature resistant cables. While both offer some level of heat protection, their design and application differ significantly.
Lastly, to reduce the risk of failure during a fire, the number of cable joints should be minimized during installation. This helps maintain the integrity of the circuit. If branching is necessary, all joints must be properly protected with fireproofing measures to ensure the system remains operational in an emergency.
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Changzhou Kingsun New Energy Technology Co., Ltd. , https://www.aioconn.com