Fire fighting of the hottest cable fire

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Cable fire fighting

due to the concealment, flammability and smoke toxicity of cable fire, it is very difficult to put out the fire

cables are mostly laid in cable tunnels, trenches and trough racks, which are relatively hidden, and it is extremely difficult and inconvenient for personnel to patrol. The best way to solve this problem is to install cable type temperature sensing alarm devices, which can detect the fire as soon as possible and identify the fire location, which is conducive to extinguishing the fire in the bud

the insulation and sheath of cables are mostly flammable materials, so the cable itself is also the easiest way to prolong and expand the fire in a fire. Flame retardant measures can be taken to solve this problem

generally, a large amount of flue gas will be produced when cables are burned, which contains HCl, Co, CO2 and other gases that are toxic to human body. When the concentration of HCl is higher than 0.1%, or the concentration of CO is higher than 1.3%, or the concentration of CO2 is higher than 10%, human inhalation will lead to coma and death. However, the content of these harmful gases in the smoke generated by cable fire accidents is generally higher than the above dangerous value, and the direct inhalation of this smoke by human body is bound to endanger life. Another hazard of smoke is to reduce the visibility of the fire scene, and the trapped people can't choose the right escape route because they lose their vision, and finally lose the chance to escape. For this reason, the production site should be equipped with sufficient positive pressure respirators and emergency hand lights for emergency use when saving people and fleeing

at present, most units are not equipped with cable automatic fire extinguishing system, and generally need to manually extinguish the fire after the cable is on fire. When fighting the fire, you must pay attention to the following matters and write them in the fire prevention plan:

(1) when the cable is on fire, you should identify the location of the fire area and give an alarm quickly according to the signal of the alarm device or on-site inspection. At the same time, the cables involved in the fire should be removed from operation by changing the operation mode as soon as possible

(2) the fire-fighting work can be carried out only after the power supply of the fire cable and other surrounding adjacent cables is cut off

(3) before the professional firefighters arrive, the person in charge of operation (shift supervisor and dispatcher) at the production site shall be responsible for the unified command of the firefighting work. After the firefighters arrive, When handing over the rescue "that's why our hybrid pocan af4130 has such amazing dimensional stability fire command, it should also explain the dangerous parts of the production site (such as the distribution of live, high-temperature, high-voltage equipment).

(4) In the process of fire fighting, personal safety should be put in the first place under the background of national policy biased towards high-energy density batteries, and attention should be paid to prevent derivative accidents of casualties such as electric shock, poisoning, collapse, fall and explosion. Sending special personnel to supervise the behavior safety of rescuers on the spot is an effective practice worthy of reference

(5) fire fighters entering cable interlayer, tunnel and trench should wear positive pressure air respirators to prevent poisoning and suffocation. When it is not certain that all the rescued cables have been powered off, the firefighters should also wear insulating boots and gloves. It is forbidden to touch the cable shell directly by hand or move the cable during rescue

(6) to extinguish the burning of cables, dry powder, carbon dioxide, 1211, 1301 and other fire extinguishing agents can be used, and loess, dry sand or fireproof bags can also be used for covering. If the fire is large, spray water can also be used to put it out. For tunnels equipped with fire doors, it is best to close the fire doors of the two sections in case of fire, so that the air in them cannot be replenished and suffocate to extinguish the fire. If the above methods can not effectively control and prevent the production and use of fire-fighting disasters according to the standards, it can be considered to use the method of filling water into the burning tunnel and ditch to seal the fire section with water, so that it can extinguish itself in order to improve its degradation performance

(7) during the fire fighting work, attention should be paid to protecting the fire scene as much as possible. After putting out the fire, the fire scene should be recorded, photographed, videotaped, etc. in a timely manner, and the remaining cable sections at the fire site should be saved, so as to analyze and judge the cause of the fire

(8) conduct fire drills regularly

train enterprise employees to master fire prevention facilities, and conduct fire drills regularly, so that on-the-job personnel can correctly and quickly implement fire prevention and fire fighting emergency measures, and be familiar with fire-fighting methods and evacuation routes. Only by carefully conducting fire drills at ordinary times can we avoid the rush of fire and reduce disaster losses

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