What to do in the event of an electrical fire

The first thing you should do is try to cut off the power supply, preferably with an insulated tool. Prevent personal accidents caused by the firefighting process. If you need to cut the wire, you should cut it at different parts, and be careful of the wire that has fallen.

Do not use a foam fire extinguisher when extinguishing a fire. Foam fire extinguishers have conductive properties and cannot be used for electrical fires, so they should be kept away from live objects when extinguishing fires. If the fire is too big to save itself, you should call the fire department as soon as possible to prevent the spread of the fire.

Electrical fire generally refers to the heat energy released due to the failure of electrical lines, electrical equipment, appliances and power supply and distribution equipment; e.g. high temperatures, arcs, electric sparks, and non-faulty energy releases; For example, the red-hot surface of an electric heating appliance ignites the main body or other combustibles under the condition of combustion, and also includes fires caused by lightning and static electricity.

There are many causes of electrical fires. In addition to design and construction reasons such as equipment defects and improper installation, heat and sparks or arcs generated by electric currents are the direct causes of fires and accidents.

The main thing is to do a good job in the following aspects of daily life:

Inspect the power lines so that problems can be detected in time.

When designing and installing electrical circuits, the dielectric strength of wires and cables should not be lower than the rated voltage of the network, and the insulators should also be selected according to the different voltages of the power supply.

During the installation of the line and the construction process, it is necessary to prevent scratching, wearing, and touching the wire insulation, and pay attention to the quality of the wire connection joint and the quality of insulation and wrapping.

In particularly humid, high temperature or corrosive substance places, it is strictly forbidden to insulate the wire open, should use casing wiring, in dusty places, lines and insulators should be cleaned frequently, do not accumulate oil.

It is strictly forbidden to connect and pull the wires indiscriminately, and when installing the lines, the wires of the corresponding sections should be reasonably selected according to the load of electrical equipment. In addition, the spacing between wires and wires, between wires and building components, and between insulators used to fix wires should meet the requirements of the regulations.

Regularly check the circuit fuse, select a suitable fuse, do not adjust the fuse at will, and do not use aluminum wire and copper wire to replace the fuse.

Check whether all connection points on the line are firm and reliable, and require that no flammable and combustible materials are stored nearby.

Cut off the power supply and extinguish the fire with a fire extinguisher suitable for electrical fires, such as four-recorded carbon.

First cut off the power supply, it is better to extinguish the fire with sand. Nowadays, electrical fire monitoring is generally installed. Because now there are more and more household appliances. Electrical fire monitoring.

When it happens, you immediately cut off the power supply and then extinguish the fire. It is advisable to install an electrical fire monitoring system.

There are three possible causes of an electrical fire:1. Leakage:

When the leakage occurs, the leakage current will flow into the earth on the way, if it encounters a part with a large resistance, it will produce a local high temperature, causing the nearby combustibles to catch fire, thus causing a disaster. In addition, the leakage spark generated at the leakage point will also cause disaster.

2. Short circuit: due to the sudden decrease of resistance and the sudden increase of current during short circuit, the instantaneous heat generation is also very large, which greatly exceeds the heat generation of the normal operation of the line, so that the insulation layer burns rapidly, and can melt the metal, causing the burning of nearby flammable combustibles and causing fire.

3. Overload:

When the conductor is overloaded, the aging and deterioration of the conductor insulation layer is accelerated. When severely overloaded, the temperature of the wire will continue to rise, and even cause the insulation of the wire to burn, and can ignite the combustibles near the wire, thus causing a fire.

The causes of electrical fires can be as follows:

1. Leakage:The use of wires for different times for too long may affect the aging of some lines or the problem that the insulation technology ability of the wire insulation skin can be weakened, so that the relationship between the wire and the wire or between the wire and the development of the earth will produce a leakage current beyond the normal business scope of the enterprise. With the accumulation of social time, the contact resistance value of the leakage point continues to increase, and the system causes the wire to heat up, and it is very easy to ignite the surrounding combustibles due to excessive temperature. When the leakage phenomenon is serious, there is also a risk of electric sparks, which is very simple and easy to cause electrical fires.

2. Short circuit. Damage to the conductor insulation can lead to short circuits in the line, such as direct contact between the phase wires or between the phase wires and the neutral or ground wires, resulting in a sharp increase in drag reduction currents and an instantaneous increase in the temperature of the line and the surrounding environment. In addition to igniting short-circuits in the line insulation, the heat generated by the wires can cause fault arcs that can ignite surrounding combustible materials and cause disasters.

3. Overload.

If the circuit breaker and wire cross-section are not reasonable, or if the circuit continuously operates beyond the rated ampacity, the wire temperature will continue to rise. When the overload phenomenon is serious, it can cause the insulation layer of the conductor and the objects around the conductor to burn, causing an electrical fire. Overload can also accelerate short-circuit faults caused by the aging of wire insulation.

4. The contact resistance is too large.

The contact resistance is the resistance that is formed at the joint, and if the contact society is well developed and can be contacted, the temperature that produces relatively little heat and maintains a working normal temperature is maintained. However, there are often problems such as poor welding and mixed impurities at the contact points, which makes the students' contact resistance too large and causes the joint to heat up, which may cause the occurrence of electrical fires in China.

The causes of electrical fires can be as follows:

1. Leakage:The use of wires for different times for too long may affect the aging of some lines or the problem that the insulation technology ability of the wire insulation skin can be weakened, so that the relationship between the wire and the wire or between the wire and the development of the earth will produce a leakage current beyond the normal business scope of the enterprise. With the accumulation of social time, the contact resistance value of the leakage point continues to increase, and the system causes the wire to heat up, and it is very easy to ignite the surrounding combustibles due to excessive temperature. When the leakage phenomenon is serious, there is also a risk of electric sparks, which is very simple and easy to cause electrical fires.

2. Short circuit.

In the event of an electrical fire, dry chemical fire extinguishers, carbon dioxide and carbon tetrachloride fire extinguishers can be used. However, sufficient distance must be maintained during use, for example, for equipment below 10kv, it must be kept at a safe distance of more than 40cm. In addition, if the electrical equipment catches fire during operation, it is necessary to extinguish the fire after the power supply is staged.

Electrical fire refers to the fire caused by electric energy as a fire source, mainly occurs in the building, and is easy to evolve into a major fire accident.

The types of fire extinguishers are:

1. Portable foam fire extinguisher. Foam fire extinguishers are suitable for extinguishing the initial disaster of oil and general substances.

2. Portable carbon dioxide fire extinguisher. Carbon dioxide fire extinguishers are suitable for extinguishing the initial disaster of precision instruments, electronic equipment and electrical appliances below 600 volts.

3. Portable dry powder fire extinguisher. Dry powder fire extinguishers are suitable for extinguishing initial disasters such as oil, combustible gas, and electrical equipment.

4. Portable "1211" fire extinguisher. The "1211" fire extinguisher is suitable for extinguishing the initial disaster of valuable items such as oil, instruments and cultural relics and archives.