If the light switch is turned off, is there still electricity on the wire that connects the bulb?

If we turn off the light switch when we change the bulb, then the bulb is out of power at this time, and we can replace it with confidence at this time. If you still feel uneasy, you can buy one and test it. At this time, the switch of your light is turned off, which means that your light is off.

I voluntarily turned off the light, but now the wire connecting the bulb is still electric. Of course, this wire is always charged. If you convert this wire into that kind of bright energy, this kind of electric energy is the switch of this light that you control.

So it's obvious that it's been expressed, this light bulb that you connect, this wire, this wire is always charged, there's no doubt about it.

Although the switch of the light is turned off, the wire connecting the bulb is still electrified, but it does not form a complete circuit, and the bulb does not emit light. In other words: the wire line is closed by the live wire and the neutral line to complete the circular line, so that the electrical appliances can shine and heat.

The switch just turns off the live wire, and the weak power of the neutral wire is still in the line of the bulb port, which must be clearly understood.

If the switch of the light is disconnected, whether the bulb has electricity depends on whether the switch is wired correctly, if the switch is connected to the live wire, the bulb will be out of power, if the switch is connected incorrectly, connected to the neutral line, the bulb is electrified, and it will be dangerous to change the bulb at this time.

Turn off the light, the two wires under the lamp holder are not electric, because the switch of the light is mainly to control the power supply of the two wires under the lamp holder. When you turn it on, two wires are energized, so the lights are on, and when you turn it off, both wires are powered off, so the lights are off.

When installing the wire, we should pay attention to the correct wiring method, and avoid the joint in the process of installing the wire, if the joint will cause a large resistance, then the wire will heat up.

If there is a wire joint, in order to avoid accidents, the wire joint should be wrapped with insulating tape.

Electrical Safety Precautions:1. It is forbidden to move household appliances by hand, such as table fans, washing machines, televisions, etc.

2. It is forbidden to repair live lines or equipment at home with bare hands and feet.

3. It is forbidden to touch with wet hands or wipe lamps, switches and other electrical appliances with wet cloths.

4. It is forbidden to change the three-prong plug to a two-prong plug at will.

5. It is forbidden to pull and connect wires indiscriminately.

6. It is forbidden to add electrical appliances to the original line without permission.

7. It is forbidden to use unqualified electrical equipment.

8. It is forbidden to use electric irons and hair dryers unsupervised.

Electric stoves and other electrical appliances.

9. It is forbidden to set up private power grids for fishing, anti-theft, hunting, etc.

10. It is forbidden to use lead wire, copper wire and other substitute fuses for fuses. Wait a minute.

Hello: 1. After the power of the lamp is turned off, there is no voltage between the two wires connecting the lamp holder, butIt doesn't mean there is no electricity

2. Note: a. If the switch controls the neutral line, the lampholder will be electrified;

b. Even if the switch is wired correctly, the zero line will be charged under special circumstances!

c. Non-professionals, it is forbidden to contact the wire under any circumstances.

The regular installation method is that the switch is connected in series between the live wire and the lamp holder, after turning off the switch, the live wire is disconnected, and the neutral line is of the same potential to the ground, so it is not charged, therefore, as long as it is a regular installation, the lamp holder is not charged after turning off the lamp.

The wire that connects the lampholder is definitely electrified. Don't try it to avoid electric shock.

After turning off the lights, the lights are turned off with a single-wire switch, so that the installation switch is not completely closed, and he may be electrified, but the switch is set at the zero line and will be electrocuted.

The light switch is turned off, and the live wire still has electricity, because the cut wire on the switch is connected to the zero wire, and it is good to replace it with the live wire. In the single-phase three-wire socket, the middle is the grounding wire, which is also used for positioning, and the other two ends are connected to the fire wire and the neutral wire respectively, and the wiring sequence is the left zero and the right fire, that is, the left side is the zero line, and the right side is the fire wire.

All household appliances with metal shells use single-phase three-wire power plugs. The three plugs are arranged in a regular triangle, and the longest and thickest copper plug on the top is the ground wire. The two below the ground wire are the fire wire (the symbol letter is"l"live wire), zero wire, the order is left zero and right fire.

Extended Materials. The difference between the live wire and the neutral wire is that they have different voltages to the ground: the voltage of the live wire to the ground is 220v; The voltage of the neutral line to the ground is equal to zero (which itself is connected to the earth). So when one part of the person hits the line of fire and the other part is standing on the ground, and the voltage between these two parts of the person is equal to 220V, there is a risk of electric shock.

On the contrary, even if a person uses his hand to grasp the zero line, if the person is standing on the ground, because the voltage of the zero line to the ground is equal to zero, the voltage between the various parts of the human body is equal to zero, and the person is not in danger of electric shock.

If the live wire and the neutral wire once touched, because the voltage between the two is equal to 220 volts, and the resistance between the two contact points is almost equal to zero, the current is very large, and a huge amount of heat will be generated at the contact point of the live wire and the neutral wire, thus emitting an electric spark, and the temperature at the spark is high enough to melt the metal wire.

It means that the switch is the zero line, not the live line.

Summary. Add a switch and bulb halfway to the wire, how to wire pro! Hello, glad to answer for you.

Add a switch and bulb wiring method in the middle of the wire as follows: 1. Cut off the power supply, and use a voltage detector to measure whether the wire is live. 2. Connect the L-pillar of the switch to the live wire, and the N-pillar to the neutral line.

3. Connect the L1 post of the switch to one end of the bulb, and the other end of the bulb to the zero line. 4. Turn on the power to see if the bulb will light up, and then cover the bulb with a mask. Hope mine can help you!

Do you have any other questions?

Which wire of the light cable can be connected to the live wire?

Add a switch and bulb halfway to the wire, how to wire pro! Hello, it's a pleasure to answer for you. Add a switch and bulb halfway through the wire and wiring the bulb as follows:

1. Cut off the power supply and use a voltage detector to measure whether the wire is live. 2. Connect the L pillar of the switch to the fire smoldering line, and connect the N pillar to the zero line. 3. Connect the L1 post of the switch to one end of the bulb, and the other end of the bulb to the zero line.

4. Turn on the power to see if the bulb will be on, and then cover the bulb with a mask. Hope mine can help you! Do you have any other questions?

Summary. Hello, dear, glad to have a problem for you, the situation that both lines of the switch have electricity should be broken by the zero line. The cause of this failure may be that the joint is severely oxidized and the contact is poor, resulting in the disconnection of the neutral wire or the fact that the neutral wire has been burned out, resulting in both wires being connected with the live wire and thus making both wires electrified.

At this time, it is necessary to focus on checking whether the joint of the zero line is burned out and burned. If yes, reconnect.

Hello, dear, I'm glad to ask for you, the switch has electricity on both lines, and the zero line should be broken next to the cavity. The reason for this failure may be that the joint is seriously oxidized and the contact is poor, resulting in the disconnection of the neutral wire or the burning of the neutral wire, resulting in the communication between the two wires and the live wire, so that both wires are electrified. At this time, it is necessary to focus on checking whether the joint of the zero line of the early cavity is burned out.

If yes, reconnect.

The two wires of the electric light are one of the live wire and the other is the neutral wire. Use aluminum wire to connect copper wire, aluminum wire is easy to corrode, and it is not sold when it comes into contact. The zero wire is not in good contact or is broken, and it becomes two wires with electricity, remove the aluminum wire, and connect it with copper wire.

Household electricity is all single-phase electricity: one phase wire (live wire) and one neutral wire. In addition, there is a ground reed friend line, which is set by the user.

Both wires are electrified, and it is obvious that the middle pin is a neutral line that cannot be passed. Since the neutral line is not connected, the neutral line is electrified. If the live wire and the neutral wire once touched, because the voltage between the two is equal to 220 volts, and the resistance between the two contact points is almost equal to zero, the current is very large, and a huge amount of heat will be generated at the contact point of the live wire and the neutral wire, thus emitting an electric spark, and the temperature at the spark is high enough to melt the metal wire.

Here's how to connect a light switch with a wire: This Kai

The two wires at one end of the wire are connected to the zero and live wires of the power supply, and the two wires at the other end are connected to the switch, and the indirect zero wire in the wire is cut off, and the two binding posts of the electric light are connected. Note: Plug in the power supply only after the lights and switches are connected.

The two wires at one end of the wire are connected to the zero and live wires of the power supply, and the two wires at the other end are connected to the switch, and the indirect zero line in the wire is cut, and the two binding posts connected to the electric lamp are called. Note: Plug in the power supply only after the lights and switches are connected.

Hello, for reference, dear, first of all, when measuring the two wires with a voltage tester, it should be that the zero line joint is seriously oxidized, the contact is poor, or it is burned out, at this time, it is necessary to focus on checking whether the joint of the zero line is burned out and burned. If so, please re-defeat the streak. In addition, due to the transformer, the three-phase electric load is unbalanced, the neutral point is offset, and the neutral point is not detected to cause the neutral point to be electrified.

Another possibility is that the low-voltage side of the distribution transformer is outlet, in the three-phase four-wire circuit, if there is a phase live wire L in the three-phase live wire L iron or grounding, it can also cause zero n charged, then measure with a voltage tester, the zero line n is live, but the live wire that is grounded or built with iron may not be measured to be live, but it can be used correctly. There is also a possibility that the low-voltage side of the distribution transformer out of the zero line n burned out or poor contact, serious oxidation, the backbone line zero line n burned out, burned, poor contact, serious oxidation, then use a voltage tester to measure the zero line n is live, at this time, it can not be used to use, so as not to burn out household appliances.

Install the switch between the incoming and outgoing wires of the live wire.