Why does the wire spark when it has been used for a long time?

The insulation selection is not suitable, such as high voltage level and low insulation level; The insulation layer loses its insulation ability due to high temperature, humidity and corrosion; Tie the wire with wire or hang the insulation on a metal object; Over time, the insulation layer is worn and aged; Lightning strikes overvoltage, voltage rises when the line is not loaded, etc., so that the wire insulation layer is hit and causes a short circuit. Wire insulation needs to have a certain ability to withstand voltage, if the wire current exceeds the current carrying capacity, the wire heating will be intensified, its insulation capacity will be rapidly reduced, the insulation will accelerate aging, and finally lead to the loss of insulation ability, broken down by voltage, so that the metal core is directly in contact or through the arc and conducted, which is called short circuit. When the wire is short-circuited, it produces abnormal high temperature or arc electric sparks, causing nearby combustible substances**, which is often referred to as electrical fire.

Electrical short circuits can also cause electrical equipment to carry dangerous voltages, which can cause electric shock accidents.

If the contact at the line joint is poor, there will be contact resistance, and the larger the current, the greater the voltage drop at the contact, and the more severe the heating, the easier it is to burn. Direct lap joints can cause poor contact and can easily burn. The standard practice is to fix it with a terminal block or solder it at the joint.

Wires are easy to ignite when they are in contact and non-contact, but if they are fixed with terminal blocks or soldered well with solder at the joints, they will never ignite.

This is a normal phenomenon, when the latch and the socket are not in contact, an arc and a strong current will be formed, and in severe cases, the fuse may be blown or the appliance destroyed. The solution is to make this contact gap disappear as soon as possible and you'll be fine. Insert quickly after aligning the socket, do not insert slowly.

No sparks are guaranteed (because it's too late to discharge).

The plug is inserted into the socket and the spark is because the electrical appliance carried by the plug is not completely closed, so that the plug is inserted when the human hand shakes, and the intermittent virtual connection current forms a flash fire, if the inductive load will also be attached to the self-inductive voltage, the spark is stronger, in order to avoid sparks, when using this type of electrical appliances, you can choose a socket with a switch.

The two conductors are constantly coming closer together and there is a voltage on one of the conductors. Then, when the distance between the two of them is close to a certain extent, but not yet in contact, the air between the two conductors will be penetrated, causing the air to burn. In this way, what we see with the naked eye is an electric spark.

This should be the result of poor wire contact. It may be caused by the aging of the circuit, or it may be caused by the wires that are not connected securely.

Therefore, when connecting, especially where it is fixed with screws, be sure to tighten the screws. Otherwise, if the connection is not firm, it will cause the wiring to ignite, which is the phenomenon of sparks.

Also, you should always check the circuit condition at home, and pay attention to the hidden danger of aging circuits, which may cause fires and other situations, so pay attention.

The reasons for the sparks of the wires at home are: aging wires, excessive electrical load of wires, poor contact of wire joints, poor contact between wires and circuit breakers (empty opening or leakage protection), etc

Common causes of wire sparks are:

1. Damage to the wire insulator is a fault that will lead to a short circuit in the wire.

2. If the wire is overloaded for a long time, it will also have the problem of high temperature, which will lead to the wire.

3. There will be great potential safety hazards after the wire is aged, including poor contact, leakage, etc., so that the possibility of fire in the wire will be relatively large.

The main reason for the spark of the wire is because the wire is aging, the wire has a certain service life, and after the outer protective skin is aged, the wire is particularly easy to spark when it is exposed.

The spark of the wire indicates that the contact between the wire connection points is not tight, resulting in a false ignition. Sometimes, useful electrical appliances consume a lot of electricity and exceed the power of the wires, and they will also ignite at the wiring point.

It means that the wire is not firmly connected, and the contact is poor, so just tighten it.

If there is a fire in the wires in the home, then it may be because the fire wire and the neutral line collide, and the phenomenon of ignition and short circuit will occur.

1. Cut off the power supply.

When there are abnormal phenomena such as smoke and sparks in household appliances or wires such as TVs and microwave ovens, the power supply should be cut off as soon as possible, the cause of the fault should be identified, and the fire should be extinguished.

2. Fire extinguishing. When a fire occurs, if the fire is small and does not pose a great threat to people, when there are enough fire-fighting equipment around, the fire should be controlled and extinguished, and the small fire should not be ignored and cause a catastrophe.

If the fire is fierce and tends to expand, and it is too late or impossible to cut off the power supply, it is necessary to extinguish the fire with electricity. Charged fire extinguishing requires the use of carbon dioxide, carbon tetrachloride or dry powder fire extinguishers, or sand, dry soil, etc. Remember, do not use water to extinguish fires, because water conducts electricity and can easily be electrocuted and injure people.

3. Call the police immediately.

Once the flames are found to have jumped to the ceiling and the fire is difficult to control, the people trapped in it should be calm, stop fighting, evacuate quickly and evacuate the danger, and immediately report the fire.

4. Escape. When escaping from a fire, don't blindly follow each other, crowd each other, and rush around. When evacuating, be careful and run towards a bright place or an open area outside. **Do not take the elevator to escape, and take the stairs through the fire escape to escape.

When there are children and the elderly indoors, make a simple life-saving rope with bed sheets, curtains, etc., and slowly descend from the window sill to the floor or ground below along the rope so that they can get out of danger as soon as possible. After escaping from the fire, if the clothes on your body are on fire, you should take them off as soon as possible, and if you don't have time to take them off, you can roll on the spot to extinguish the fire.

If the wire is sparkling and crackling, it is very dangerous, first you need to cut off all the gates of the power supply, then extinguish the fire, and then check the cause of the fire, if it is because of the poor contact of the line joint, then you need to replace the original line, and then connect and fix the wire.

Answer: If the wire is sparking, stop using it and find an electrician to repair it.

What causes sparks in electrical wiring at home? Kiss! Hello, I am happy to answer the problem of poor contact at the joint of <>the wire at home that may be due to the sparkling wires at home.

First, what to do if the wire sparks crackles, first need to cut off all the gates of the power supply, then extinguish the fire, and then check the cause of the fire, if it is because of the poor contact of the line joint, then the original line needs to be replaced, and then the wire is connected and fixed. 2. What are the causes of wire fire 1. The phenomenon of wire fire may be due to the wrong connection during wiring, which leads to electric shock. 2. If the line contact is poor, it is easy to cause fire, so it must be tested first when wiring, and it is likely to cause a safety accident when using it normally.

3. Precautions for installing wires 1. When installing wires, the first thing to pay attention to is to turn off the main gate before installation, otherwise there will be certain dangers. 2. At the same time, it is also necessary to pay attention to the power of the wire, which should be selected according to the power of household electricity, if the power of the wire is too small, the phenomenon of tripping may occur when using it in the later stage, so we must consider this aspect of the problem. 3. The choice of the form of wire installation is also very important, whether it is indoor or outdoor, it can be installed in the way of surface installation or concealed installation, but certain protective measures must be taken, so as to avoid leakage or electric shock.

Hope mine can help you <>

Do you have any other questions?

Causes of sparks in wires:

1) Poor contact between the wire and the wire.

Among all the causes of poor contact fires, the fire nucleus caused by excessive contact resistance at the line joint is the first.

At the junction of the electrical line, if there is a loose contact between the contacts, the voltage between the contacts is enough to break through the air gap to form an arc, burst out sparks, and ignite nearby combustibles to form a fire.

2) The connection between the wire and the electrical equipment is not in good contact.

Electrical equipment violates the wiring method, the connection is not firm, or the maintenance is poor, or the oxide film with poor conductivity is produced at the joint during the operation of the long branch's socks, or the joint is loosened and oxidized due to vibration and heat, resulting in excessive contact resistance.

3) The plug is in poor contact with the plugging part of the socket.

All kinds of power supplies, electrical equipment, devices, lighting fixtures, electric heating appliances, household appliances and other plugs are in loose contact with the plugging parts of the socket.

Or poor contact will produce arcs, sparks and lead to disasters.

4) The connection between the wire and the terminal of the switch is not in good contact.

Poor contact between the wire and the automatic air switch or manual knife switch of power supply and electrical equipment, loose connection points, excessive contact resistance, local overheating, and the ignition of combustibles by breakdown arcs or electric sparks**.

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You can go to the physical store and take a look.

The wire will spark due to the instability of the circuit, which is very dangerous. The circuit is unstable, and sparks will come out of the wires, so please don't touch him. Power off in time.

Summary. Hello! Dear, I'm glad to answer for you!

Hello, in the case of a short circuit in the wire, the wire will ** oh. Damage to the wire insulator is a fault that causes a short circuit in the wire. 2. The cable will also have the problem of high temperature after long-term operation, which will lead to the wire**.

Hello! Dear, I'm glad to answer for you! Hello, in the case of a short circuit in the wire, the wire will ** oh. Damage to the wire insulator is a fault that causes a short circuit in the wire. 2. The cable will also have the problem of high temperature after long-term operation, which will lead to the wire**.

The so-called short circuit is that the two wires of the AC circuit touch each other, and the current does not pass through the electrical equipment in the line, but directly forms a loop. The short circuit of the line is caused by the fact that the transmission line has been used for too long, the insulation layer is aging and ruptured, and the insulation effect is lost, resulting in the collision of the two lines; Or is it due to the random pulling of wires, making wires"Coats"Mechanical damage, causing short circuits. Due to the defective wire joint, the line contact resistance is too large and heats up**.

Every circuit has connectors, or wires are connected to each other, or wires are connected to switches, fuses, or electrical appliances. If these connectors are not connected properly, they can block the flow of electricity through the wires and generate a lot of heat. When this heat is sufficient to melt the insulation of the wire, the insulation will ignite nearby combustibles.

Wires of a certain material and a certain size of cross-sectional area have a certain safe current carrying capacity. If the current passing through the wire exceeds its safe current carrying capacity, the wire will heat up. The more it exceeds, the greater the calorific value.

When the heat makes the wire warm more than 250, the rubber or plastic insulation of the wire will catch fire. If wires"Coats"Damage, it can also cause short circuits, and the risk of fire is greater. In addition, if a non-compliant fuse is used, the overload of the circuit cannot be detected in time, and the hidden danger will become a reality.

The company's workstation caught fire due to the aging of the circuit, is the employee responsible for this workstation?

The person in charge of the unit and the employees who are directly responsible are responsible.

First of all, the spark is small when the inductive load is powered on, and the spark is large when the power is off. Because when the power is off, there will be a reverse electromotive force more than ten times the power supply voltage, and when the voltage is high, it will produce an arc for air discharge. Theoretically, it is 1 thousand volts and 1 mm, but in practice it is not, and it will change depending on the humidity and temperature, so I just say it for the sake of remembering.

Higher-power inductive equipment will require the power to be discharged and then disconnected from the grid (feedback braking), which we generally call surges.

The capacitive load has a large spark when it is powered on, and a small spark when it is powered off. Because the voltage at both ends of the capacitor cannot be abruptly changed when the initial power is turned on, an approximate infinity current is formed. This is also why when switching the power supply, there will be a snap when the computer plug is powered on, but it is quiet when the plug is dialed, because the capacitor is full, and of course, the rectifier bridge will also prevent the capacitor from being discharged in the opposite direction.

When the capacity is large, it will cause damage to the power grid, and we generally call it what to wait until I remember to modify it.

The theoretical spark of resistive loading is approximate. In fact, sparks of different sizes will randomly appear according to the fluctuation of the alternating current, and the sparks will be small when the voltage is close to zero, and the sparks will be large when the voltage is close to zero. Direct current does not have this change process, so there is always a spark.

No matter what the load, there will just be some differences, and there will be sparks in essence.

The real reason is that the contact area when powering on is always from point to surface when it is turned on, and when the point is in contact, because the contact resistance is large, the contact point of the switch will be burned at a large current, and the spark seen is the burning contact. This is also the basis for the service life of switches and gate blades under rated conditions.

It's okay, the surface is not burned out and can be used. The spark is caused by an arc, and it is recommended that you use a contactor to switch high-power equipment.

In the process of power supply, the internal contacts of the switch and the knife switch will produce arc discharge, and if the arc discharge phenomenon is serious, the contact and the knife switch will be burned out, and the arc extinguishing cover will be used inside the switch to reduce the harm of arc.