Power cables are essential materials for transmitting electrical energy and are widely used in economic production. In modern buildings, the complexity and density of wires and cables have increased significantly, providing great convenience. However, this has also led to a rise in cable fire accidents, causing considerable challenges. If a cable catches fire, what should be done? Below, Pearl EES Cable introduces six effective fire extinguishing methods.
- Cut Off the Power Supply
Immediately disconnect the power supply to the burning cable. After cutting off the power, carefully inspect the cable to identify the fault point and organize personnel to extinguish the fire quickly.
- Disconnect Power to Adjacent Cables
In the event of a fire in a cable trench, cut off the power supply to non-faulty cables that are at risk of catching fire. If the cables are arranged in layers, first disconnect the power to the cables above the burning cable, then to those adjacent, and finally to the cables below.
- Seal the Cable Trench
To prevent air circulation and contain the fire, close the fire isolation doors of the cable trench or block both ends. This method, known as the asphyxiation technique, helps suppress the fire by limiting oxygen.
- Ensure Personal Safety
Cable fires produce large amounts of smoke and toxic gases. Firefighters should wear gas masks, rubber gloves, and insulated boots to protect against electric shock. For high-voltage cables, maintain a safe distance of 4 meters indoors and 8 meters outdoors from the fault point to avoid step voltage and contact voltage injuries. Rescue operations for injured personnel are exempt from these restrictions but must still follow safety protocols.
- Use Appropriate Fire Extinguishing Equipment
To extinguish cable fires, use fire extinguishers such as dry powder, “1211,” or carbon dioxide types. Alternatively, cover the fire with dry sand or loess. If water is used, a water spray gun is recommended. In extreme cases, after cutting off the power, water can be injected into the cable trench to seal the fault.
- Avoid Direct Contact with Cables
During firefighting, avoid direct contact with the cable’s steel armor or moving the cable by hand to prevent additional risks.
Preventing Cable Fires
To minimize the risk of cable fires, conduct regular safety inspections of electrical lines and equipment at least once a year. Pay special attention to aging, damaged, or poorly insulated wires, and replace them promptly. Always purchase cables from reputable manufacturers to ensure quality and safety.
About Fire-Resistant Cables
Fire-resistant cables outperform standard cables in fire conditions. They can maintain power supply for several hours under high-voltage conditions and withstand temperatures up to 1,000°C for short periods. These cables are ideal for use in environments requiring high safety standards.
Fire-resistant cables are constructed with highly conductive metals, ensuring low resistance, reduced energy loss, and efficient voltage utilization. The insulation is made of mineral materials with high ignition points, enhancing safety. The separation between the cable core and the outer sheath prevents direct contact, further reducing fire risks.
Even under external flames, fire-resistant cables continue to operate stably without emitting toxic gases. After a fire, these cables often remain functional, eliminating the need for replacement and ensuring reliable line operation.
Materials Used in Fire-Resistant Cables
The intermediate joints and terminals of fire-resistant cables are critical for stable operation. Key requirements include:
Secure connections between the cable core and the connecting tube to ensure low and stable contact resistance.
Insulation structures with sufficient margins for long-term stability.
Metal shells that provide both insulation protection and mechanical support.
