What should be paid attention to when installing fire-resistant wires?
2022-10-25(3497)Views
The fire-resistant wire can still maintain the normal operation of the circuit for a period of time under burning conditions, which means that in the event of a fire, the fire-resistant wire will not burn immediately, and it can still maintain normal power supply for a period of time. This characteristic determines that fire-resistant wires play an important role in modern urban and industrial buildings, as once a fire occurs, the power supply circuits of control, monitoring, guidance, and alarm systems must maintain normal operation. Next, what should we pay attention to when installing fire-resistant wires?
When installing fire-resistant wires, the following four issues need to be noted
1. When fire-resistant wires are used in densely packed wire tunnels, wire interlayers, or in flammable locations such as oil pipes and oil depots, Class A fire-resistant wires should be selected first. When these situations are eliminated and the number of wire configurations is relatively small, Class B fire-resistant wires should be selected.
2. Most fire-resistant wires are used as power supply circuits for emergency power supplies, requiring normal operation in case of fire. Due to the sharp increase in ambient temperature during a fire, in order to ensure the transmission capacity of the line and reduce voltage drop, for circuits with long power supply lines and strictly limited allowable voltage drop, the cross-section of the refractory wire should be enlarged by at least one level.
3. Refractory wires cannot be used as high-temperature resistant wires.
4. To reduce the probability of wire connector failure in fire accidents, the number of connectors should be minimized during installation to ensure that the line can work normally in a fire. If branch wiring is required, fire protection measures should be taken for the joints.
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