What is the reason why the LED light will be on if it is not connected to the neutral line?

Do you mean that the light is still slightly bright after the switch is turned off?

Hello dear, why is there no zero line lamp will be on According to the safety electrical wiring standards, the lighting circuit control line is connected to the live wire L, and for the spiral lamp holder, the live wire must be connected to the lamp head, not the spiral. There are two reasons why the bulb will be lit if it is not connected to the zero line: 1. It is possible that the power of the bulb is small, 2. The second situation is that the ground wire or the other end touches the ground, because the bulb must be bright and there must be voltage, current and loop, the circuit must be closed to form a loop, the live wire is a high potential, the earth is a low potential, high and low potential, the formation of electromotive force is the voltage, plus there is a loop, then the bulb will be on.

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Reason 1: The LED light is slightly bright after the power off because when the electrician installs the power-off switch, the power-off switch is connected to the neutral wire, not the live wire. Electricians know that the power-off switch must be powered off with a live wire, and they don't know that there will be a risk of electric shock.

However, the electrician who complained today turned out to use the neutral wire to cut off the power. After the power is off, the live wire will continue to supply power to the LED driver power supply, so the LED light will have a faint glow after the switch is turned off. I hope that friends will pay special attention to similar situations in the future.

Safety first. What is the reason why the LED light is faintly bright?

Reason 2: The LED lights are still slightly bright after the power is off, because many headlights with segments must be divided into zero live wires, that is to say, the red line (or gray) on the segments should be connected to the fire wire as much as possible, which is the safest.

In most cases, the light switch is installed on the zero line, the switch is off, the live wire is still connected, and the light is always in a live state, so the light will be slightly bright after the light is turned off. This situation is not only in LEDs, but also in ordinary fluorescent lamps. In this case, the fault is first confirmed and then handled.

What to do if the LED light is broken.

Second, what should I do if the LED light is broken?

1. A small amount of damage.

If only one or two lamp beads are broken, we can repair them in two ways:

a.Find the broken lamp bead and use a wire to connect the metal at both ends of it and short-circuit it. The effect of this is that most of the lamp beads can be lit up normally, and only the broken individual lamp beads are not lit, which has little impact on the overall brightness.

b.If you have strong hands-on ability, you can go online to buy the same model of lamp beads (ten yuan a big bag) and replace them yourself - use an electric soldering iron (a hair dryer can blow for a while) to heat the old lamp beads until the glue on the back of the old lamp beads is melted, and then remove the old lamp beads with tweezers (don't use your hands, it's too hot). At the same time, install the new lamp beads while it is hot (pay attention to the positive and negative poles) and you're done!

2. A lot of damage.

If the lamp beads are damaged in large quantities, it is recommended to replace the entire lamp bead plate. The lamp bead board is also available online, pay attention to three points when buying: 1

Measure the size of your own lamps; 2.Look good at the appearance of the lamp bead plate and the starter joint; 3.Keep in mind the output power range of the starter.

These three points of the new lamp bead board must be the same as the old lamp bead board - it is very simple to replace the lamp bead board, the old lamp bead board is fixed on the lamp holder with screws, and it can be removed directly. The new lamp beads are fixed with magnets, and the new lamp beads are removed when replacing them, and the connector of the starter is connected.

Check whether the voltage is normal first. Normally, the LED light is broken, and it is generally a problem with the power converter.

It may be that the LED lamp beads are damaged or the driver is broken, first remove the LED lamp disk, carefully check whether the lamp beads have black spots, if there is, the lamp beads are broken, replace them with new ones! If the lamp beads are in good condition, it may be that the driver is broken, mainly because some electronic components are aging, under normal circumstances, the LED lamp driver is broken and there is not much maintenance value, or replace it with a new one! Reason:

After power-on, it is slightly bright or bad, which is reflected in the LED open circuit (breakdown burns out, and the entire LED circuit becomes an open circuit state) or burned out (the LED internal resistance increases, and the power supply voltage cannot meet the power supply of the series LED circuit) Solution: Test a single LED with a multimeter (pay attention to the positive and negative electrodes), and the bright one is OK, and the bad LED is removed and replaced. It is recommended to match the power supply with high reliability, and the secondary phenomenon may be that the power supply is unstable or electrostatic damage.

This phenomenon shows that one of the LED lights (light-emitting diodes) in your LED string has been burned out and broken! The idea of overhaul is to use two pins to insert the two feet of the suspected single LED lamp, and then use the multimeter RX10K file, and measure whether there is a resistance value on the front and back of the two meter pens, if the LED is good, there must be a time when the measurement will be lit; If both measurements are infinity, the tube is open. After detecting the bad LED, you can replace it with a new one.

As an emergency repair, the two ends of the bad pipe can also be short-circuited, and the LED string light can glow normally.

It is suspected that the current is reduced due to the damage of individual lamp beads and the increase in resistance.

See if the positive and negative poles are connected incorrectly, or if one of the lamp beads is broken.

Because the ground wire is used before the zero wire is connected (its ground resistance is very large), the more bulbs with it, the lower the voltage, and the normal voltage will be restored when the neutral wire is connected.

Supplement; Find out the grounding point and dismantle it. Connect the neutral line of the power supply to the neutral line of the circuit from the entrance of the live wire. It is recommended to install a leakage protection device on the power supply end.

The new light is not lit because the zero line is missing!

Why is this so?

I thought it was when you added a new lamp, you only connected the live wire, not the zero wire, or you mistakenly took other wires as the zero line of this lamp! That's why this phenomenon has appeared!

The solution is to start checking the line again, think carefully, and take a closer look at the zero line is broken? Or maybe it's a wire that's connected incorrectly.

Or just pull a new live wire and connect it to the neutral wire!

It is correct to take the zero wire from the position of the original lamp, and the live wire is taken from the position of the original lamp switch, so that it is the correct wiring method.

The analysis of the current situation as described by you is as follows:

1. The zero line and the control line are electrified, it is a short circuit of the zero line, check whether the zero line is firmly overlapped.

2. The measuring instrument is not accurate, and there is induction, such as ordinary electric tester, etc.

3. The wiring of the control line is wrong, check the line, whether the connection is reliable.

The newly connected street light shows that the zero line of the live wire has electricity, indicating that the newly connected zero line is not connected, and there is any part of it that is broken or not connected. Please check the line to find out when there is no power, and the disconnected place is between the power and the powerless.

In this case, it means that the newly added zero wire is not connected properly, check the contact.

If there is no voltage difference, it will always open, there is no internal resistance, and there will be no photoelectric effect, only far infrared rays, which cannot be perceived, and you can personally be charged is the zero line.

You are the zero line is electrified, and the following is the reason why the zero line is electrified.

Reasons why the neutral line is electrified:

1.There is leakage of electrical equipment on the line, and the protection of the cover device is at the end of the action, so that the neutral line is electrified. In case of power failure, the equipment that leaks electricity is found to be repaired, and the cause of the final operation of the protection device is found.

2.There is a phase grounding on the line, and the total protection device in the power grid is protected at the end, so that the neutral line is electrified. After the power failure, first use the shake meter to measure the line to see if the line has bad insulation, and pay attention to the instrument in the line to be disconnected when measuring.

3.The zero line is broken, and there is leakage or a large single-phase load in the electrical equipment behind the fracture, so that the zero line is electrified. After the power outage, test whether the zero line is broken, and find and repair the broken line.

4.In the zero grid, there are individual electrical equipment that takes protective grounding and leakage, so that the zero line is electrified. Distinguish whether the system is zeroed or grounded, or if the zeroing system is repeatedly grounded. Then proceed to install the ground wire correctly.

5.In the zero grid, there are single-phase electrical equipment that adopts "one fire and one place", that is, there is no working zero line, so that the zero line is electrified. Install N line, do not use PE line as N line.

6.In the power grid, the insulation resistance of some electrical equipment has been damaged and leakage, so that the neutral line is electrified. Check the pure stove and find out that the insulation resistance does not meet the specified requirements of the equipment, and repair it.

7.The working grounding connection on the low-voltage side of the transformer is poorly contacted, and there is a large resistance, so that the neutral line is live when the three-phase load unbalanced current exceeds the allowable range. It is not easy to find poor contact, and it is necessary to overhaul it every year or at the specified time, and it is not lazy to be overhauled according to the regulations.

8.The high voltage is channeled into the low voltage, which makes the neutral line electrified. It's hard to find, and sometimes something goes terribly wrong. The most difficult one to deal with, dangerous to people. Be sure to follow the operating procedures.

9.When the grounding body is too close to the low-voltage working grounding or repeated grounding body, the voltage drop on the high-voltage working grounding will affect the working grounding of the low-voltage side and make the neutral line live. Find out the cause and lay it according to the corresponding procedures.

10.The magnetic field induction causes the neutral line to be charged.

11.Electrostatic induction causes the neutral line to become electrified.

12.Due to the insulation resistance and the voltage division of the capacitance to the ground, it can lead to the electrification of the electrical equipment housing.

This can be due to poor contact of the bulb, or it can be the presence of stray electrical mold currents in the power supply. If this happens, it is recommended that you should carefully check the light to see if it is loose or disconnected. If everything is in order, then it is time to go to a professional to help with it.

There is no zero wire on the switch, why is the dry seepage hole of the lamp brightAnswer, dear, hello! Glad to serve you! According to the safety electrical wiring standard, the lighting circuit control line is connected to the live wire L, and for the spiral lampholder, the live wire must be connected to the lamp head, and the spiral cannot be connected without drying.

If you don't connect the zero line, the bulb will be on, it is possible that the power of the bulb is small, the second situation is to connect the ground wire or the other end touches the ground, shouting because the bulb should be bright What must be voltage, current and loop, the circuit must be closed to form a loop, the live wire is a high potential, the earth is a low potential, high and low potential, the formation of electromotive force is the voltage, plus there is a circuit then the bulb will be bright. Hope it helps.