Fire-resistant cables can still maintain normal operation of the line for a period of time under burning conditions. That is to say, in the event of a fire, the fire-resistant cables will not burn all at once, and they can still maintain normal power supply for a period of time. This characteristic determines that fire-resistant cables play an important role in modern urban and industrial buildings, because once a fire occurs, the power supply circuits of control, monitoring, guidance, and alarm systems must maintain normal operation.
The main use occasions of fire-resistant cables:
Fire-resistant cables are mainly used in power supply circuits from emergency power supply to user fire protection equipment, fire alarm equipment, ventilation and smoke exhaust equipment, navigation 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 and cable mezzanines with dense cables, or in flammable places such as oil pipes and oil depots, Class A fire-resistant cables should be selecte first. Except for these situations and when the number of cable configurations is small, Class B fire-resistant cables should be selecte.
2. Fire-resistant cables are mostly used as power supply circuits for emergency power supplies and are required to work normally in case of fire. Since 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 resistant cables.
4. In order to reduce the probability of cable joint failure in a fire accident, the number of joints should be reduced as much as possible during installation to ensure that the line can work normally in a fire. If branch wiring is required, fireproofing should be done at the joints.
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