Senior electrician please come in My zero line fuse keeps burning what s going on

This indicates that it is more likely to be caused by poor contact. You may still use the old-fashioned knife switch, if this switch is always burned fuse, [the fuse is not too thin, the capacity of the switch is enough] is generally burned where the surface is oxidized or uneven, resulting in poor contact, the contact resistance is large, the old shut-off is not overload or short circuit but overheating after heating, [the fuse is a low melting point alloy]. It is best to replace the leakage switch or air switch.

If you don't change it, you should clean the contact points and polish them brightly. In addition, check whether the power cord is locked, whether the screws are loose, and the terminal head will also heat up and cause the same fault.

According to your statement, this situation must be grounded with the zero wire, there are two possibilities: one is that you see if it always jumps when you turn on that appliance, if it is, it must be a problem with this appliance, if not, it is a problem with a certain socket, and it feels that the socket in the kitchen or bathroom is the most likely, check it.

That is, the total load of your home exceeds the rated load of the fuse, calculate the total load of your appliances, and then put on the appropriate fuse.

Now there is no need for fuses, and the best solution is to change to a small 20A air switch. In the future, there will be no fuse, and the appliance will automatically trip if there is a problem.

The zero line is burned out, and there must be a big one on the zero line.

The current flows. Causing an overload to generate heat on the neutral line.

There are only two possible zero-line currents:

1. The three-phase imbalance is caused, but the neutral line current will not exceed a certain phase.

2. Caused by the third harmonic, the neutral current not only exceeds the live wire current, but also reaches 2 to 3 times of the live wire current.

In the second case, the HHYLX neutral current eliminator can be installed... If there is a fire, it will be troublesome.

Replace the leakage protector with a larger one, but also consider the current resistance of your main wire to avoid bad situations.

The weather is too hot and the power supply is insufficient. The voltage is not enough. Electricity consumption has increased dramatically. The insurance is prone to burnout. Let's install leakage protection switches and air switches.

It is estimated that your house is an old house, and you have to see how big the plug-in fuse is in your house, and the smallest one is only 5a. It is advisable to find an electrician to make appropriate adjustments according to the situation of your home.

Install a leakage protector, more than 20 yuan, burn the insurance is that your fuse is too thin and aging, choose the right insurance according to the actual situation at home.

1. It may be related to the quality of the fuse.

2. If the fuse is left for a long time, it may be oxidized.

3. Leakage protector can be installed. The order is only about 30-40 yuan.

I make electrical appliances, so I know a lot about this. Hope it works for you.

Depending on how big your insurance is, if you match the air conditioner, only 5-6A current, plus 15-20A insurance such as lighting rice cookers, washing machines, etc., is enough, but there can be no high-power electrical appliances, such as induction cookers, electric water heaters, etc. The starting current of the air conditioner is large, mainly because the wires in your home are small, there is a voltage drop, and the family must install a leakage switch, which is a safety must.

There are several reasons why fuses are often burned at home:

1. The power of the fuse is small, and the load of household appliances exceeds the load of the fuse;

2. There is a circuit grounding or short circuit;

3. The quality of the fuse.

Electricians are special operations and need to be troubleshot by professional electricians.

It may be that the load of the air conditioner has increased in hot weather recently, so the current has also increased during work, resulting in the burning of the fuse, you can slightly increase the fuse to choose the thicker one, the length of time the fuse is generally not affected, it is its material and thickness that affect it. If you don't have a leakage protection switch at home, it is recommended that you install a ** is not expensive, dozens of dollars, the fuse only does short-circuit protection, there is no leakage protection, your household appliances are easy to leakage, so it is necessary to install a good one.

The main thing is that your fuse is too thin, if you replace it with a 30a, it will definitely not burn, and now it is rarely used with this thing, the contact is not good, it is easy to ignite, pay attention to the socket and power supply wire at home, and the 4 square ideal can also be, if it is too thin, it will become an electric furnace wire, it will be hot, and it will smoke if you use it again, and the consequences are unimaginable.

The wires must be replaced thick, they must all be replaced (except for the light wires and switch wires), and then go to the industrial electrical store to buy a 2P20A air switch with leakage, the contact is good, it will not burn, it will only trip, and it will be good to close it, it is very convenient, so that the electrical appliances at home are enough to use electricity, and it will not flash again.

Be sure to find a professional to operate.

The starting current of the air conditioner far exceeds the working current, so the light will be dark, which also means that your home electricity is not rich, otherwise it is not obvious, and the original design of the house may be insufficient. It's not the time you turn on the air conditioner, but every time you turn it on after the shutdown (the outdoor unit of the air conditioner doesn't rotate all the time), it is likely that it will be burned again when it starts and the electricity peak burns.

The leakage protector is responsible for preventing leakage, which is much more sensitive, and the air switch prevents overload and overheating, etc., which is not the same. Even if it is changed or tripped, it is more convenient to close the fuse, which is more convenient than changing the fuse. You can buy it according to the power marked on the meter.

What is the cause of a fuse that burns out at home.

What are the causes of a fuse burning at home, there are many reasons why a fuse is burning at home, and they are usually caused by the following reasons:

1. There is a short circuit in the power line or socket at home.

2. The electricity consumption is too large, and the electricity is overloaded.

3. The quality of the fuse itself, Duan Yin is causing it to be easily burned.

Solution: 1. If there is a short circuit fault in the electrical line (socket) at home, first eliminate the fault, and then replace the fuse next to the new one.

2. If it is caused by overload of electricity, it is necessary to replace the new fuse, and pay attention to reducing the number of household appliances used at the same time, especially high-power household appliances.

3. If it is blown out due to fuse quality problems, replace it with a new fuse.

Can you replace the copper wire if the fuse is blown out?

1. Can the copper wire be replaced if the fuse is blown out? Generally speaking, the copper wire can not be used instead of the fuse when it is blown out, because the resistance of the copper wire is small, so the internal energy generated when the current passes through is small, and the melting point of the copper is higher, and the current passed by the copper wire when the copper wire is "fused" is already very large, which can not play the role of protecting the circuit, and is easy to cause the fuse to blow.

2. Copper wire can be used for temporary emergency use, and it can never be used for a long time, which will have potential safety hazards of overload and easy to cause short-circuit fire. The reason why fuses use a metal with a low melting point, such as lead and tin, is that it protects electrical equipment and electrical wiring, which can damage the circuit when the current load is too high.

3. However, if the fuse with lead and tin is used, its melting point is low, and it is blown when the current is too large, it can protect the electrical appliance. The melting point of copper wire is much higher than that of lead and tin, and it will not fuse when the current is large, which will damage the electrical appliance. If you can't find it temporarily, you can use copper wire to replace it temporarily, but you should replace it as soon as possible after finding it.

Therefore, fuse selection is very important.

The function of the fuse is to automatically disconnect the power supply circuit when the current in the circuit is too large, so as to prevent the safety accident of the power supply circuit. There are two reasons for excessive current in the circuit: one is a short-circuit fault; One is that the total power of high-power appliances is too large.

In the event of a short-circuit fault, the current flow is very large and the fuse will be burned out in an instant, and the fuse should not be burned out often (understand that sometimes it can work).

After clearing the short-circuit fault, the problem lies in the fact that the total power of the high-power appliance is too large. The principle of selecting the fuse is that the rated digging voltage of the fuse should be equal to or slightly exceed the maximum normal working current of the power supply circuit. In the case of the use of fuse wire, this criterion is not taken into account, and there is a large randomness.

The rated voltage of the commonly used fuse wire is larger than that of the power supply circuit, and the amount of normal working current (assuming that the cable selection is effective) is smaller, and the high-power electrical appliances used in the application are considered to be more and less, and the current is small when the current is less, and the fuse wire is not melted when the current is large for a long time.

Household fuses are often burned out, indicating that the electricity consumption is unsafe, one is that the load of the power supply circuit is too large, and the other is that the fuse wire does not meet the requirements. In such a case, it is not possible to blindly follow the trend to increase the fuse, and it is necessary to fully consider the working capacity of the power supply circuit and its cable load. The circuit breaker of the application must be connected to the route in series, and the assembly should be completed in the vertical direction, and the assembly place should be on the neutral line of the fire wire.

If it is a two-phase three-wire, or three-phase four-wire power supply circuit, the circuit breaker cannot be assembled to prevent unnecessary inconvenience. Nowadays, it is rare to use fuses, and it is proposed to change it to an air switch. If copper wire is used instead of fuse wire, once the current in the circuit is relatively large, it cannot be melted immediately, so the situation of fire accident occurs.

If there is a problem with the machinery and equipment in the high-voltage switchgear, the copper wire cannot be maintained, and there will be electro-optical short-circuit faults, which will damage the high-voltage switchgear.

The fuse in the house is burning, probably because of excessive electricity consumption. If the fuse is blown out, it cannot be replaced by copper wire, because the resistance of copper wire is relatively small.

The cause of a blown fuse in your home may be due to excessive load, short circuit or leakage of electrical wiring. After the fuse blows, try not to replace it with copper wire.

If the fuse is blown out, it is likely that the current is too large, and the copper wire cannot be replaced after the fuse is blown out.

It's dangerous for you to use it like this!

For a 3000w instantaneous electric water heater, make sure that the socket that supplies power to this water heater is at least a 16A socket and the wire should be 4 square millimeters. Otherwise, it is easy for the wires to catch fire.

Secondly, it is necessary to ensure that the power supply of the incoming line has sufficient capacity, otherwise it will trip.

If the power supply capacity is sufficient, a higher level fuse is recommended!

According to the formula.

p = ui, power = voltage * current.

i=200/220=

Based on the power you provide 200W, the current does not exceed 5A.

It may be that the rated current of the fuse is too small, and it is recommended to replace it with a larger fuse.

The battery is charged but the vehicle does not start: Do not fire continuously when the vehicle fails to start.

The tachometer is normal, and the speedometer shows zero: at the same time, the ABS alarm light is on, indicating that the fuse corresponding to the ABS is burned out.

Pressing the glass water switch does not spray out the glass water: pressing the switch for a long time will cause the motor to overheat and burn out the corresponding fuse.

Ask what happened when a high-power appliance blows a fuse as soon as it is used.

Is there something wrong there, and I can't check it.

The household electrical load is too large, causing overload and blowing the fuse. This is especially true when using air conditioners, electric heaters, or other high-power appliances.

2) Poor contact.

Although some families choose a relatively reasonable fuse and the load is not too large, they will "trip" when using large power appliances such as air conditioners, electric heaters, and rice cookers. The reason may be that when installing and replacing the fuse, the fuse is in poor contact with the plug screw, resulting in ignition and heating, so that the screws fixing the fuse on the porcelain plug and gate knife are oxidized and "burned".

3) Short circuit. If the fuse is replaced and "trips" as soon as it is closed, it may have a short circuit. The first is a short circuit in the line. The second is the load short circuit, such as electric kettles, rice cookers and other commonly used high-power appliances and plugs of commonly used mobile appliances, as well as inferior electrical appliances, are prone to short-circuit faults.

4) Pulse. When the circuit is started or the power supply is unstable, an instantaneous high current causes the fuse to be disconnected; In addition, if the fuse is not tightened during installation, or the fuse is damaged, the fuse will also be blown off.

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Question: I've always used it this way before, and the day before yesterday, I started to burn out the high-power fuse.

I can't check out where there's a problem.

Find a professional electrician to check with a meter!

As soon as the question was turned on, the high-power electrical appliances were first dimmed, and then the power was cut off after more than ten minutes.

Question, and the place where the fuse burned out was hot.