The wires at home are on fire when they are short circuited, why does the air at the door not trip

The wire is short-circuited and on fire, why is it empty and not tripped?

The reasons are as follows: one. Air switch.

It is a very important electrical appliance in low-voltage distribution network and power drive system, which integrates control and a variety of protection functions. In addition to being able to complete the contact and breaking circuit, it can also protect the circuit or electrical equipment from short circuit, serious overload and undervoltage, etc., under normal circumstances, the armature of the overcurrent tripper is released; In the event of a serious overload or short-circuit fault, the coil connected in series with the main circuit will generate a strong electromagnetic attraction to attract the armature down and jack the locking hook, so that the main contact is disconnected.

Two. The selection of air opening is very important, and the general household miniature circuit breaker (DZ47 series) should be the maximum current carrying capacity of the wire.

Otherwise, it will not play an overcurrent protection role caused by short circuits.

The wire fire has nothing to do with whether the air open trips, the normal air open only when the current on the line below it is greater than its rated current or the line temperature reaches its protective action value, and the air open will not act if these two conditions are not met. Now there is a kind of protection device called fire leakage alarm, which is the first road leakage fault is about to lead to a fire before the alarm signal is issued, and it can also be linked to cut off the circuit to prevent fire.

Short circuit caught fire and did not trip? It's almost impossible! Now there are several floors of commercial houses that are empty!

First of all, there will be an empty opening when the meter comes out, and there will be a total opening after entering the house, and there will be a number of functions in each area after the total opening. If there is no empty opening tripping after a short circuit, then your empty opening is too big, but at least the empty opening behind the meter will not be big!

Therefore, it is most likely to be an overload caused by a fire!

When there is a short-circuit of the line and fire, the reasons for the air switch does not trip: first, the empty opening capacity is too large, and the short-circuit current can not cause tripping. Second, the empty opening failure, stuck stagnation caused by tripping failure. The third power supply line is too long, and the cross-sectional area of the line is too thin.

That is the kind of empty open that does not have short-circuit protection, or it may be that the air-open short-circuit protection circuit is faulty. will form a short circuit without tripping phenomenon.

It is possible that the air switch does not match the power of your home, resulting in the short circuit current of the wire being less than the air trip current but not tripping; It is also possible that the empty opening failed and did not trip.

1. If the air opening fails, it will not automatically trip and lose its protective effect.

2. The empty open configuration is too large, and the slight short circuit of the line is that the short circuit current is less than the action current of the empty open, and the empty open will not trip.

The wires are all on fire, why didn't they trip when they were empty? Old electrician: It is very important to match the air and wires.

The air switch is too big, and the wire will not trip if it burns.

An air switch, also known as an air circuit breaker, is a type of circuit breaker. It is a switch that automatically disconnects whenever the current in the circuit exceeds the rated current. The air switch is a very important electrical appliance in the low-voltage distribution network and the power drive system, which integrates control and a variety of protection functions.

Under normal conditions, the armature of the overcurrent tripper is released; In the event of a serious overload or short-circuit fault, the coil connected in series with the main circuit will generate a strong electromagnetic attraction to attract the armature down and jack the locking hook, so that the main contact is disconnected. The undervoltage tripper works on the contrary, when the voltage is normal, the electromagnetic suction pulls the armature and the main contact is closed.

In the event of a severe voltage drop or power failure, the armature is released and the main contact is disconnected. When the power supply voltage returns to normal, it must be re-closed before it can work, and the voltage loss protection is realized.

It may be that the current setting value of the empty opening is too low, or some electrical appliances are manually wired and the joints are not compressed. Ordinary switches generally do not have overvoltage or undervoltage protection, but will only pass through overcurrent or several sections of protection, such as fuses, only in the case of excessive current will trip and power off, and the trip time is generally determined by the size of the current.

My house was plugged in and on fire, and it was immediately dialed out, the electric switch jumped, there was no electricity, and the whole building was out of power.

Hello dear <>

My house is plugged in and on fire, and it was immediately dialed out, the electric switch jumped, there was no power, and the whole building was out of power, what is going on If the socket suddenly sparked, the whole house was cut off, it means that the socket was broken because of a short circuit in the connection, or because the electrical appliances you are using are overloaded. If such a problem occurs, first unplug the power cord on the socket, go to the power switch to confirm whether the brake is hail and annihilated, close the switch, and observe whether it is normal. If there is no problem, it means that there is a problem with the electrical appliance you just used.

This is a common occurrence in everyday life. This is because there was a short circuit inside the socket, and then the main switch in the house was turned off. Now you don't have to rush to close the power transmission, it is estimated that you will not be able to send the power, and you will jump as soon as the power is transmitted, because the fault has not been eliminated.

You first turn the outlet on and troubleshoot the short circuit. If the socket burns out, buy a new one. You can close the source to rush and transmit power.

Summary. The electric switch has been tripping, and when it is closed, it will spark, and there is a short circuit. Turn off the switch first and wait for an electrician to repair it to avoid damage to the appliance and cause a fire.

2. When checking the circuit, turn off the electrical appliances at home and unplug the refrigerator, washing machine, computer, etc. Pull down all the sub-switches, reset them one by one, and check those that cannot be reset in the key points.

3. If there is a spark at the joint of the line of the main switch, it may be that the wire is loose and the contact is poor, just tighten the screw. If there is a flashing spark inside the circuit box and there is a sizzling current sound, it is the main switch that is broken.

4. Check whether there are UMC sockets, sockets, and high-load electrical appliances. Replace aging sockets and sockets, and if the voltage is overloaded, you should use as little as possible and stop using high-power electrical appliances.

Excuse me, what should I do if the wiring at home is broken, it keeps tripping, and the electric switch keeps sparking?

The electric switch has been tripping, and sparks will spark as soon as it is closed, which is the place where there is a short circuit in the destruction of the accompaniment. Turn off the switch first and wait for the electrician to repair it, so as to avoid damage to the electrical appliances and cause a fire. 2. When checking the circuit, the electrical appliances at home should be turned off, and the plugs of refrigerators, washing machines, computers, etc. should be unplugged and slowed down.

Pull down all the sub-switches, reset them one by one, and check those that cannot be reset in the key points. 3. If there is a spark at the joint of the line of the main switch, it may be that the wire is loose and the contact is poor, just tighten the screw. If there is a flashing spark inside the circuit box and there is a sizzling current sound, it is the main switch that is broken.

4. Check whether there are UMC sockets, sockets, and high-load electrical appliances. Replace aging sockets and sockets, and if the voltage is overloaded, you should use as little as possible and stop using high-power electrical appliances.

Turn off the electric switch and ask an electrician to inspect and repair it.

Sparks are more dangerous, it is recommended to contact the maintenance master electrician to deal with it, for safety, it is recommended that you do not handle it easily.

The old building, two gates, the light gate and the socket gate, plug in the stupid trace seat well, the light gate jumps, a spark when it is closed, can you take it yourself and repair it? Zhihu asked the master to check the line and said that it would cost 100, about how much it was.

Generally speaking, it is like 50 to 15.

Even if the light gate is sparkling, it may be burned or other problems, it is easy to leak, contact the electrician is better than the Sen brigade, and deal with it yourself and then cause a short liquid spring to do the road will outweigh the loss.

The wire is on fire, and the air switch does not trip, basically the air is too large, the wire is too small, so for the home circuit, we must reasonably configure the wire and the air open.

1. The cause of the wire fire.

Current overload: For wire fire, it is due to the excessive current on the wire, which has exceeded the safe current that the wire can bear, so the wire will be overloaded, and heat will be generated after overload, and when the heat reaches a certain ignition point, the wire sheath will be **.

Short circuit of wire: Due to the short circuit of the live wire and the neutral wire, the current on the wire is too large, so it will heat up, causing **.

Wire connector virtual connection: In the position of the wire joint, due to the poor connection, it will form a virtual connection, and the virtual connection will ignite, produce overheating, and cause **.

Second, the principle of empty tripping.

The empty opening trip is through the current on the outgoing line, to break the trip, for the empty opening will have a rated current value, such as the air opening of C16, its rated current value is 16A, when the current on the wire exceeds 16A, it will trip, if the current is less than 16A, the air opening will not trip.

3. The reason why the wire is on fire and does not trip when it is open empty.

The air opening configuration at home is too large, for example, the air opening is 63a, and the wire is wired, so the configuration is seriously unreasonable. Because the wire can withstand a maximum current of 16A, for example, after the load current reaches 30A, the wire will form an overload, and overheating will be formed after overload, and then cause **, and the current of 30A does not exceed the rated current of the air open, so the wire is on fire, and the air open will not trip, and the configuration of the air open and the wire in the home circuit must be reasonably configured, otherwise it will not play a protective role.

Fourth, the method of configuring the air opening and wires of the home circuit, first of all, the family configures the wires, and the wires should be configured according to the times of the current of the load. For example, the load current is 10A, 10A, so the wire to be configured with the wire, the wire withstand current is 16A, the configuration of the air open should be configured in accordance with the safe current of the wire, and the wire should be consistent with the air opening, for example, the square wire can withstand the current of 16A, the configuration of the air open should use C16, and the 4 square wire should bear the current of about 24A, so the configuration of the air open C25, 6 square wire current is 36A, so the configuration of the air open with C40. Therefore, the configuration of the wire should be configured according to the multiple of the load current, and the configuration of the air open should be consistent with the safe current carrying capacity of the wire, if the configuration is unreasonable, the air open is too large, and the wire is too small to bear the current, it will form the wire fire, and the air open does not trip, for the home circuit, the wire and the air open should be reasonably configured.

It is possible that the burning wires are just the outer skin, and they have not burned into the inside, so there will be no short circuit, so the air switch is not tripped to protect it. In this case, it has nothing to do with the empty opening, but there is also a situation that the quality of the empty opening is not good, and the product is not up to standard, so there is no tripping.

The wire diameter in the loop is too small, and the wire is overcurrent for a long time, which causes the wire to heat up, and the temperature reaches the ignition point of the insulation layer, and the wire burns, and the current does not exceed the air protection current, and it will not trip in this case.

This may be because the air switch is not ** to the wire on fire, it may be that the wire is broken, and the air is broken, because only in this way will it not trip protection.

The wire is obviously on fire, why don't the empty and leakage warrants trip? Don't do this for wiring at home.

Summary. Hello dear, the main line is on fire, the reason why the leakage insurance does not trip at home is: the leakage switch mainly plays the role of short circuit, overload and leakage protection 1, when the wire is short-circuited, the instantaneous current in the circuit reaches the action current of the leakage switch, the leakage switch action, disconnect the circuit, the wire fire is obviously not caused by a short circuit, so the leakage switch does not trip 2, when the circuit is overloaded, the wire has a large current for a long time, after reaching a certain time, the leakage switch will also trip, unless there is a situation, That is, the rated current of the leakage switch is greater than the carrying current of the wire, at this time, the leakage switch will not trip, but the wire will heat up, and when it reaches a certain temperature, the wire will catch fire.

The main line is on fire, and the leakage insurance at home does not trip.

Hello. Hello dear, the main line is on fire, the reason for the branch noise of the leakage insurance does not trip at home is: the leakage switch mainly plays the role of short circuit, overload and leakage protection 1, when the wire is short-circuited, the instantaneous current in the circuit reaches the action current of the leakage switch, the leakage switch action, disconnect the circuit, the wire fire is obviously not caused by a short circuit, so the leakage switch does not trip 2, when the circuit is overloaded, the wire has a large current after a long time, after reaching a certain time, the leakage switch will also trip, unless there is a situation, That is, the rated current of the leakage switch is greater than the noisy carrying current of the wire, at this time, the leakage switch will not trip, but the wire will heat up, and when it reaches a certain temperature, the wire will catch fire.

Leakage protector, the leakage at home will trip.

No, it won't. Outside, the main line that was picked up was electrified, and the electrical appliances at home were on fire.

How about making the main power come back, if the line is installed, install a protector to trip automatically.

It usually doesn't trip.

You can put the leakage protector, and the reverse connection will not trip.

The main line of electricity has burned the household appliances twice.

The reverse one will not either.

Because the reverse connection is the same as normal.

1. The reasons why the wire does not jump when the wire is short circuited and ignites in the air are: the current value of the wire after ** has not reached the starting and jumping set value; The rated current value of the empty opening does not match the line; The wires have been sharded.

2. Air opening generally refers to circuit breakers. Circuit breaker refers to a switchgear that can close, carry and break the current under normal loop conditions and can close, carry and break the current under abnormal loop conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use, and the division of high and low voltage boundaries is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances.

3. The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, protect the power supply line and motor, and automatically cut off the circuit when they occur serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and underheating relay. In addition, there is generally no need to change parts after the break-off fault current seeps forward. At present, it has been widely used.