• Categories:Industry News
• Author:
• Origin:
• Time of issue:2023-03-14
• Views:0

(Summary description)The fire-resistant cable can still maintain the normal operation of the line for a period of time under combustion conditions, which means that in case of a fire, the fire-resistant cable will not burn immediately, 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, as once a fire occurs, the power supply circuits of control, monitoring, guidance, and alarm systems must maintain normal operation.
The main usage scenarios of fire-resistant cables are:
Fire-resistant cables are mainly used in power supply circuits from emergency power supply to user fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, guide lights, emergency power sockets, emergency elevators, etc.
When installing fire-resistant cables, staff should pay attention to the following issues:
1. When fire-resistant cables are used in densely packed cable tunnels, cable interlayers, or in flammable locations such as oil pipes and oil depots, Class A fire-resistant cables should be selected first. When these situations are eliminated and the number of cable configurations is relatively small, Class B fire-resistant cables should be selected.
2. Most fire-resistant cables 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 fire-resistant cable should be enlarged by at least one level.
3. Fire-resistant cables cannot be used as high-temperature resistant cables.
4. To reduce the probability of cable joint failure in fire accidents, the number of joints 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.