Welcome to Jiexi Kunlian Cable Co.,Ltd , in this article, we will discuss the fire cable’s fire resistance.
The fire-resistant cable can still maintain the normal operation of the line for a period of time under burning conditions, that is to say, in case of fire, the fire-resistant cable will not burn all at once, and it can still maintain normal power supply for a period of time. This feature determines that fire-resistant cables play an important role in modern cities and industrial buildings, because once a fire occurs, the power supply loops of the control, monitoring, guidance and alarm systems must maintain normal operation. The main use occasions of fire-resistant cables: Fire-resistant cables are mainly used for power supply circuits from emergency power to user fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guide lights, emergency power sockets, emergency elevators, etc.
Workers need to pay attention to the following issues when installing fire-resistant cables:
1. When fire-resistant cables are used in cable tunnels, cable interlayers with dense cables, or in flammable places such as oil pipes, oil depots, etc., Class A fire-resistant cables should be selected first. Excluding these conditions, and when the number of cables is small, class B fire-resistant cables should be used.
2. Fire-resistant cables are mostly used as power supply circuits for emergency power supplies and require normal operation in case of fire. As the ambient temperature rises sharply during a fire, in order to ensure the transmission capacity of the line and reduce the voltage drop, for circuits with long power supply lines and strictly limited allowable voltage drops, the cross-section of the fire-resistant cable should be enlarged by at least one level.
3. Fire-resistant cables cannot be used as high-temperature cables.
4. In order to reduce the failure rate of cable joints in fire accidents, the number of joints should be reduced as much as possible during installation to ensure that the lines can work normally in a fire. If branch wiring is needed, fire-proof the joints should be done.