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Several problems needing attention when installing fire-resistant cables

The fire-resistant cable can still maintain the normal operation of the line for a period of time under combustion conditions, that is, in case of fire, the fire-resistant cable will not burn at once, and it 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.

Main application occasions of fire-resistant cable:

Fire resistant cables are mainly used in power supply circuits from emergency power supply to users' fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, running lights, emergency power sockets, emergency elevators and so on.

Workers should pay attention to the following problems when installing fire-resistant cables:

1. When fire-resistant cables are used in cable tunnels and cable interlayer with dense cables, or in flammable places such as oil pipes and oil depots, class a fire-resistant cables shall be selected first. In addition to these conditions, and when the number of cables is small, class B fire-resistant cables shall be selected.

2. Fire resistant cables are mostly used as the power supply circuit of emergency power supply, which requires normal operation in case of fire. Due to the sharp rise of ambient temperature in case of fire, in order to ensure the transmission capacity of the line and reduce the voltage drop, for the circuit with long power supply line and strictly limited allowable voltage drop, the section of fire-resistant cable shall be enlarged by at least one gear.

3. Fire resistant cables cannot be used as high temperature resistant cables.

4. In order to reduce the failure probability of cable joints in fire accidents, the number of joints shall be reduced as far as possible during installation to ensure that the line can work normally in fire. If branch wiring is required, the joint shall be fireproof.

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