The electrical appliances can be used normally, but the socket live wire and the zero line all make

The zero line is obviously in poor contact! Preliminary suspicion that the main gate of your home, that is, the zero line contact of the air switch, is not good, and it is recommended to replace it with a new one. Under normal circumstances, the zero line will never make the test pen light up!

You can borrow a digital multimeter and turn on the high-power appliances at home at the same time (such as water heaters, hair dryers), then you go to test the top and bottom of the main switch to see if the voltage is consistent, if the consistent switch is fine, if it is inconsistent, it proves that the contact is poor, the larger the voltage difference, the worse the contact condition. Of course, you should make preparations before the test, such as removing the panel of your home appliance box, measuring the incoming voltage before testing, and then measuring the voltage after the appliance is turned on, so as to make a comparison, I hope you can find the fault point!

It's very simple, other people's homes use electricity normally, but your home can't, indicating that the main gate is no problem, that is to say, the total zero line or zero trunk line is no problem, see if there is electricity at the upper and lower ends of the empty zero line of your home, if there is electricity at the upper end, it proves that the zero line of your home is connected at the main gate, (but it is unlikely) if there is electricity at the lower end of the empty open, and the upper end is not brought, change the empty open, if the empty open is fine, (the small empty open of the home should not be less than 3 bar, one is the lamp, a socket, a total empty open, I'm talking about the total empty opening).

You are a layman, the zero line is broken, it is possible that the zero line is connected to the earth. It is very dangerous to burn electrical appliances carefully.

Method steps.

Wiring standards. The color of the line of fire (L) shall be red, yellow, and green; The color of the zero line (n) shall be black and blue; The color of the ground wire (PE) shall be yellow and green. Face 3-pin socket, left zero, right fire, middle ground.

Install a leakage circuit breaker on the bus, and connect a bulb to the live wire and the neutral wire or the live wire and the ground wire, if the leakage circuit breaker action indicates that it is the ground wire, otherwise it is the neutral wire.

If you are at home: when you turn on the electricity and use an electric pen, it will be all the live wire. Disconnect the zero line at the main switch, only turn on the live wire, turn on the lights at home in the open position, measure with an electric pen, it was not lit just now, and now it is all the zero line. All that is left unlit is ground.

The simplest, take a 220V bulb, use an electric pen to determine the live wire, respectively with two wires and live wire connected to the lamp head, from the brightness can distinguish the zero line and the ground wire, the bright one is the zero line, the slightly darker is the ground wire.

with a multimeter. Put the multimeter in the AC file 500V, pinch a meter pen, and the other meter pen is connected to the power cord respectively, the high voltage is the live wire, the low is the neutral line, and the voltage is 0 is the ground wire. The resistance of the neutral line to ground is less than 4 ohms for reliable grounding.

Use a multimeter to place the pressure difference between the 250V fire line and the neutral line, the live wire and the ground wire in the AC file, and the difference between the two values is less than 5V for reliable grounding.

The livewire voltage tester will be displayed, while the neutral line will be absent or very small.

The electric detector is lit by the live wire, and the light that is not lit is the neutral wire or grounding wire.

Use the neon tube electric detector pen to contact the two power cords of the electrical appliances that are working normally, and the neon tube is the live wire, and the non-light is the zero line.

It is not easy to distinguish during normal operation, if you have to distinguish, the live line is brighter, and the zero line is slightly brighter.

Only the live wire is bright without loading, and if the zero line is not loaded, it means that the zero line has a problem of poor contact. Hope!

The key to this problem should be understood from the fundamental principle, dismantling the electric detector can find that the neon tube resistance is connected in series through the human body grounding, and a certain voltage can be applied to the neon tube to make it glow. Therefore, regardless of whether the household appliances are working normally or not, as long as the voltage of the live wire to the ground exceeds a certain voltage or the voltage of the neutral line to the ground also exceeds a certain voltage, the neon tube will definitely be able to emit light.

It is not possible to make the neon tube glow unless the neutral wire is grounded.

First of all, to correct the lighting circuit, that is, the socket for 220V single-phase AC, there are only two holes and three holes, and the corresponding bolts are divided into two pins and three pins, not two and three phases. The number of phases refers to the number of live wires used in alternating current. China's alternating current is only single-phase 220V and three-phase 380V, and there is no two-phase electricity, if only two-phase live wire is charged in a power supply circuit, it is a lack of phase, it is an electrical fault, and it will seriously damage electrical equipment.

Let's talk about the question you asked about the neon tube of the voltage tester. The voltage tester mainly measures the voltage of the live conductor, not the current, because the voltage tester is in parallel with the conductor. The reason why the neon tube of the voltage tester emits light is because one end of the neon tube is connected to the live wire, and the other end is connected to the human body, and the voltage is added to both ends of the neon tube, and the front end of the neon tube has a safety resistance with a large resistance value, which reduces the current.

A very weak current flows through the neon tube to the human body and then to the earth to form a loop, which makes the neon tube light up. So in order for the neon tube to emit light, it must be given a voltage. The reason why the neutral line is called the neutral line is because its voltage is zero, because the voltage is applied to the electrical appliance.

Although there is a current passing through the neutral line when the circuit is working, there is no voltage, so the current will not flow to the neon tube when the voltage tester contacts the neutral line, which is also related to the resistance of the voltage tester, and the current distribution in the parallel circuit is inversely proportional to the resistance. A short circuit in the circuit will cause the live wire to be directly connected to the neutral wire, so the contact of the voltage tester with the neutral wire is equivalent to direct contact with the live wire, so the neon tube will also be bright.

The switch is connected to the live wire, the switch is not closed, the live wire - electrical appliances - the zero line will not be electrified, the switch is closed, after the switch is passed, the live wire - electrical appliances - the zero line will be electrified, then the zero line is broken, and there is electricity before the breakpoint, that is, "the live wire transmits power to the zero line through the electrical appliances, so the zero line is also electrified".

The neutral line is broken and there is no current circuit, and at this time, when there is a load on the entire circuit, you will use the voltage tester to show that both jacks are live.

Because the neutral line has been nearly grounded (grounded through the neutral point of the transformer), the live wire is not connected, and the current passes through the neon bubble of the electric pen, the resistance of the electric pen, the resistance of the human body, and the earth during the measurement, so the measurement of the live wire is bright.

Hello: Because after the live wire passes through the load, if the neutral line is not broken, the potential of the neutral line end of the load is zero, so use a pen to measure the zero line, the neon tube does not shine, but if the neutral line is broken, and the neutral point is not a loop, the zero line of the breakpoint through the load is the same potential as the live wire, and there is a potential difference with the ground, so use the pen to measure the zero line, the neon tube will glow.

In China's three-wire and four-wire power supply system, on the low-voltage side of the transformer, the neutral point of the transformer winding is repeatedly grounded, so the neutral line of the power supply system is at the same potential as the earth.

The voltage tester is a tool used to distinguish the neutral line and the live wire, when using the voltage tester, the hand should touch the metal body at the end of the pen, and the tip of the pen should touch the wire;

If the neon tube does not emit light, it indicates that the voltage tester and the human body are added between the zero line and the earth, and the voltage tester is in contact with the zero line;

If the neon tube glows, it indicates that the voltage tester and the human body are added between the fire line and the earth, and the voltage tester is in contact with the fire line;

The four points A, B, C, and D in the test chart of the tester, only point A does not emit light, indicating that B, C, D and the live line are figured out, and point B and the zero line are disconnected, so there is a break between A and B

Therefore, the answer is: the metal body at the end of the pen; The Line of Fire; A and B are intermittently disconnected

In this case, it means that there is a load on the circuit, that is, there is a useful electrical appliance, under normal circumstances, there is a circuit when the electrical appliance is turned on, and the live wire forms a path with the neutral line through the electrical appliance, and the electricity is transmitted to the neutral wire, so the neutral line will have electricity.

After the neutral line is disconnected, because it is walking in parallel with the live wire, induced electricity is generated, and the neon tube of the test pen is shiny. If the zero line is not disconnected, there is induced electricity, and it is also discharged by the circuit, and the test pen will not shine.

First of all, the tester will glow when it touches the live wire. When the firewire is disconnected, neither jack is shining, which is a certainty. When the neutral line is broken, the live wire is connected to the neutral wire through a circuit that is sufficient for other electrical appliances. Will make the tester glow.

The end of the neutral line is broken, and an electrical appliance nearby is connected to the measuring end of the neutral wire.

The neon tube of the electric detector is luminous is the zero line is broken and the live wire is connected normally, the live wire is normal will be the current into the electrical appliance, the electric detector goes to the electroscope fire, zero two ends, the neon tube is connected to the live wire and the human hand respectively, forming a voltage difference, the neon tube will glow, if the live wire is broken, the current does not enter the electrical appliance from the wire, the electric pen is used to detect the electrical fire, zero two ends, the neon tube will not emit light.

Therefore, the neon tube of the electric detector pen is luminous, and the neutral line is broken and the live wire is connected normally; The neon tube of the electric tester does not emit light, which is the fire wire is broken.

The neutral wire cannot be grounded, and the grounding wire is a separate dedicated wire.

Clause.

First, there is a device on the line that is being connected, and the live wire is transmitted to your electric pen through the device, and the zero line can only be brought when it is broken.

Clause. Second, the electric pen does not shine or the electric pen is broken, or the fire wire is broken, otherwise the electric pen should be bright.

**Coming to two outlets? It's called a single-phase socket, because it's a single-phase electricity "One Fire and One Zero". But so there are three-phase outlets?

I haven't seen it yet. Single-phase socket is generally impossible to have both holes live, the zero line is generally broken by change, no loop is formed, the live wire current flows through the electrical appliance to the zero line broken end, so that the broken end close to the electrical appliance is electrified, and the socket is not plugged in with the electrical appliance, the live wire electricity is impossible to flow into the zero line hole. But there is still a situation where the zero line hole is electrified, that is, the main zero line in front of the socket zero line access point is broken, and the live wire is connected to the broken end of the main zero line through other electrical appliances at home, so that the main zero line is charged by the end of the live wire, and then the zero line of the socket is connected from the end of the live zero line, so the zero line hole is electrified.

The correct phenomenon is to touch the metal body of the remaining part of the tail of the electric tester with your hand, and then touch the live wire and the neutral line with the tip of the pen respectively. When it touches the live line, the neon tube shines, and when it hits the neutral line, the neon tube does not shine.

The correct phenomenon is that when it touches the premature collapse and the line of fire, the neon tube cherry blossom is widely shining. Lu Songyuan.

The neon tube does not emit light when the zero line is touched.

How to understand the fire wire break, the break point and the fire wire can make the neon tube of the voltage tester glow? Neon cannot be made between the break point and the zero line.

Hello dear, it is a pleasure to serve you: how to understand the fire wire break, the break point and the fire wire can make the neon tube of the test pen glow? The distance between the breakpoint and the neutral line should not be such that neon is equivalent to connecting the neutral wire to the live wire, and the neutral wire becomes a part of the live wire.

The reason why the normal zero line can not make the neon tube of the tester shine is that there is no power supply between the zero line, the tester, the human body, and the earth (zero line), and there is no current flowing through the tester, so the neon tube of the tester will not emit light. Thank you for your trust, the above is my reply, I hope it can help you, I wish you a happy life!

If you have any questions, you can give me feedback in time