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 the event of a fire, the fire resistant cable will not burn at once, and it can still maintain normal power supply for a period of time. This feature determines that fire resistant cable plays 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 the normal operation.
The main application occasions of fire resistant cable:
The fire resistant cable is mainly used in the power supply circuit from the emergency power supply to the user's fire fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guide lights, emergency power sockets, and emergency elevators.
Workers need to pay attention to the following issues when installing fire resistant cables:
- When fire resistant cable is used in cable-intensive cable tunnels, cable interlayers, or in flammable places such as oil pipes and oil depots, class A fire resistant cable should be selected first. In addition to these cases, and when the number of cable configurations is small, Class B fire resistant cable should be used.
- Fire resistant cable is mostly used as the power supply circuit of emergency power supply, and it is 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, the cross-section of the fire resistant cable should be enlarged by at least one level for a circuit with a long power supply line and a strictly limited allowable voltage drop.
- The fire resistant cable cannot be used as a high-temperature resistant cable.
- In order to reduce the failure probability of fire resistant cable connectors in fire accidents, the number of connectors should be minimized during installation to ensure that the lines can work normally in fires. If branch wiring is required, fireproof treatment should be performed on the joints.
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