How to Properly Care for and Maintain Fire-Resistant Cables
Release date:
2022-09-08 10:48
Source:
Fire-resistant cable Use it in daily life. To keep it in better condition, wires and cables should be regularly maintained and cared for. However, many people don’t have a thorough understanding of how to maintain wires and cables. So, how should fire-resistant cables be properly maintained and serviced?
1. Check the surface of the fire-resistant cable for any damage or cracks. If found, it is recommended to return it directly to the manufacturer.
2. Try to avoid storing wires and cables in open-air or damp locations.
3. Installed cables must not be flattened.
4. It is strictly prohibited to store electrical wires and cables together with acids, alkalis, or corrosive gases and substances. Additionally, no deductible hazardous gases or corrosive metals should be kept in the warehouse.
5. When storing wires and cables, they must be kept isolated from the ground. You can place a wooden block beneath the wires to prevent moisture from reaching the floor.
6. Ensure the seal head is intact.
7. Regularly check your skin for injuries, abrasions, or signs of overheating due to excessive load. Always ensure that the electrical load stays within the capacity of your home wiring. In cases of severe overloading, short circuits may occur.
8. Check the bending radius, operating temperature, and cable length.
Under normal circumstances, maintaining fire-resistant cables offers two main benefits. First, regular maintenance and upkeep of power lines not only help reduce waste of electrical resources but also minimize unnecessary expenses. Moreover, proper care ensures smoother operation and significantly lowers the risk of malfunctions. This approach effectively prevents energy waste while extending the lifespan of the insulation.
Precautions for Fire-Resistant Cables
1. The main difference between fire-resistant cables and flame-retardant cables is that fire-resistant cables can maintain normal power supply for a certain period during a fire, whereas flame-retardant cables do not have this capability. They are primarily used in the power circuits of users' fire-fighting equipment, fire alarm systems, ventilation and smoke exhaust systems, emergency lighting, emergency power outlets, and emergency elevators.
2. Ordinary fire-resistant cables are classified into Type A and Type B: Type B cables can withstand at least 90 minutes of burning in flames ranging from 750°C to 800°C under rated voltage without the cable being punctured (i.e., a 3A fuse will not melt). Building upon improved manufacturing processes for the insulation layer and enhanced fire-resistant coatings, Type A fire-resistant cables have been developed. These cables can endure at least 90 minutes of continuous burning in flames between 950°C and 1000°C, while maintaining their integrity under rated voltage.
3. Precautions regarding the superior fire-resistant performance of Class A fire-resistant cables compared to Class B fire-resistant cables: 1. When fire-resistant cables are used in cable tunnels, areas with densely packed cables, or flammable locations such as oil pipelines and oil depots, Class A fire-resistant cables should be selected. In all other cases—particularly when the number of cables is relatively small—Class B fire-resistant cables may be used instead. 2. Fire-resistant cables are typically employed as emergency power supply circuits, requiring them to function normally even during a fire. Given the rapid rise in ambient temperature during a fire, it is crucial to ensure the cable circuit maintains its intended current-carrying capacity, minimizes voltage drop, and supports long-term power delivery by strictly limiting allowable voltage reductions.
4. Fire-resistant cables cannot be used as high-temperature cables. To reduce the failure rate of cable joints during fire incidents, the number of joints should be minimized during installation, ensuring that the circuit remains functional even in the event of a fire.
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