How does an electric pen distinguish between live wire, ground wire, and neutral wire? The color of

When decorating, the fire line, the zero line, and the ground wire are all one color, first of all, this is a very non-standard and irresponsible practice, we must pay attention to it, and resolutely put an end to this practice; However, after the wiring has been laid, I can't distinguish the live wire, the zero wire, and the ground wire, and I don't want to change the wire, and the tools are only electric pens, pliers, screwdrivers, and wire strippers; Let's share with you how to use the above tools to distinguish between live wire, neutral wire, and ground wire.

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Ad. The first thing we can do is to distinguish the line of fire

The fire wire partition is the simplest, only need to use an electric pen to easily and simply test out, and then prepare a roll of electrical tape for marking, it is recommended to use red tape; The specific method is: after the end of the wire is processed, send the electricity, we use the pen in our hands to contact the core of the three wires, if the pen indicator light is the live wire, the remaining two are the neutral wire and the ground wire, we use red tape to mark the live wire.

Then let's distinguish between the zero and ground wires

After distinguishing the live wire, there is only the zero line and the ground wire, to distinguish the zero line and the ground wire, we need to use the common electrical appliances in the house, we have each one, that is, the light bulb, we want to use the light bulb to test the zero line and the ground wire; The specific method is that after the power is off, first use the live wire we distinguished earlier to access a wire of the bulb, and then use one of the other two wires to access the other wire of the bulb, after the wire is connected, we can send power, if the bulb is bright is the zero line, if the bulb is not lit is the ground wire; Then mark the wires that have been distinguished, wrap blue tape if it is a neutral wire, and wrap black tape if it is a ground wire.

Through the above steps, we can easily distinguish the live wire, neutral wire, and ground wire; Although it seems simple, it is still recommended that if you are not a professional electrician, it is better not to operate, and you must pay attention to safety!

About the same color of the three wires at home, how to distinguish the fire wire, zero line, and ground wire with several designated tools, have been analyzed for everyone, I hope to help you, the above are personal views, if there are deficiencies, please leave a message to discuss! In the end, I would like to ask you to pay attention to the home miscellaneous altar and give more comments to the electrician's house**, thank you very much.

The fire wire partition is the simplest, only need to use an electric pen to easily and simply test out, and then prepare a roll of electrical tape for marking, it is recommended to use red tape; The specific method is: after the end of the wire is processed, send the electricity, we use the pen in our hands to contact the core of the three wires, if the pen indicator light is the live wire, the remaining two are the neutral wire and the ground wire, we use red tape to mark the live wire.

Then let's distinguish between the zero and ground wires

After distinguishing the live wire, there is only the zero line and the ground wire, to distinguish the zero line and the ground wire, we need to use the common electrical appliances in the house, we have each one, that is, the light bulb, we want to use the light bulb to test the zero line and the ground wire; The specific method is that after the power is off, first use the live wire we distinguished earlier to access a wire of the bulb, and then use one of the other two wires to access the other wire of the bulb, after the wire is connected, we can send power, if the bulb is bright is the zero line, if the bulb is not lit is the ground wire; Then mark the wires that have been distinguished, wrap blue tape if it is a neutral wire, and wrap black tape if it is a ground wire.

Friend, use the voltage tester to measure the power supply fire, zero, and ground wire, there is a little bit of a bad difference, but you can measure it like this - three wires use the voltage tester to measure the direct glow of the live wire, disconnect this live wire, and then connect any wire to the live wire, and measure it with the voltage tester on the equipment shell - the test pen emits light as the ground wire, and does not emit light as the zero line, pay attention to otherwise short circuit or electric shock.

Friend. Teach you a dangerous method.

Start by using an electric pen to find the line of fire.

I'm using this line of fire to touch the other two wires.

There was a strong bright light, and even the sound of a popping sound could be heard on the zero line.

There is a slight light and the leakage circuit breaker operates on the ground wire.

1. The common color of the live wire is red, and some electricians will also use green and yellow wires as the live wire; The wire color of the neutral wire is mostly black and blue; The ground wire is usually a yellow and green wire. 2. In the case of power-on, we will close the electric pen to one of the binding posts or jacks, if the electric pen will light up or beep, it means that this wire is a live wire; If the pen does not glow or make a sound, the wire is a part. You can also use the universal meter to measure the voltage to distinguish, usually the voltage measured by the live wire will be higher, and the voltage measured by the neutral line will be relatively lower.

3. The live wire usually refers to the wire that transmits electricity in the circuit; The neutral wire refers to the neutral wire in the three-phase electricity that has zero current when the three phases are balanced. The live line is generally represented by the letter L, and the zero line is represented by the letter N. When you connect wires to sockets, etc., you should connect the live wire and neutral wire according to the identification of the socket; Or when you connect the wire, you should wire according to the principle of the ground wire on the left zero and the right fire.

If the color of the general fire line is measured with a black electric pen, when measuring the live wire, the electric pen will light up and the measurement zero line electric pen will not shine, under normal circumstances, the left zero line and the right live wire.

The commonly used live wire is yellow, and there are also red wires, and the zero line is often blue or black, and there is a kind we call the ground wire, and the ground wire is often used in the color line, such as green orchid and so on.

In the common three-phase four-wire system, there are three live wires, which are generally identified by yellow, green and red colors, the zero line is generally identified by the light blue line, and the ground wire is identified by the yellow-green interphase line. When measuring the line with a voltage tester, you must pay attention to the electricity specifications and personal safety to prevent electric shock. Generally, the indicator light of the voltage tester will light up when the pen tip of the voltage tester meter touches the live wire, and the indicator light of the voltage tester will not light up when it touches the neutral line and the ground wire, but from the perspective of electricity safety, non-professional electricians are not allowed to operate live even if you can distinguish between the live wire and the neutral line.

The neutral line and the live line are respectively.

Fireline : Mostly red.

Neutral line: mostly blue and black.

If you use a sound pen, when you touch the pen, the sound is a little louder, the sound of the live line is lower, the zero line, and the sound is broken.

The line of fire is red, and the line of zero is blue.

When distinguishing the live wire, you only need to use an electric pen, after the wire is processed, send the electricity, and hold the electric pen to contact the core of the three wires respectively, only one wire can light up the electric pen, this is the live wire. When distinguishing the zero line, first use the live wire to connect a wire to the bulb, and after connecting the wire, if the bulb is on, it is the zero line.

Commonly used wire colors: red, green, yellow (single-phase: brown).

Common neutral wire colors: black, blue.

How to distinguish with an electric pen:

A-When the circuit is normal, the live wire electric pen neon gas tube is lit.

b- When the circuit is abnormal, the live wire, the electric pen, the neon gas pipe is lit, and the zero line is broken.

Don't take the test pen as the standard, there will be mistakes The test pen is broken or the use of the wrong test wire is not lit: it is not shallow!

A few dollars for a small portable multimeter.

In the electrical method, red is generally the line of fire, and the change is black. But some developers don't do what they're asked to do. When you use an electric pen to measure, pinch the metal body at the end of the pen with your hand!

It won't be electric for you. Use the tip of the pen to measure electricity, which one is bright at this time, which one is the fire wire. If you don't touch the metal body at the end of the pen, you can't measure the brightness.

The line of fire is often red, a few will use yellow, the zero line is blue, a few are black, and others are also used. Meter test, light on, live wire. Generally, the switch is connected by the live wire.

Electron pen to measure the zero line and ground wire method:

1. Although the three wires are the same color and were not marked at that time, you can easily judge the fire line. Go to the power switch and close, then go back and measure the three wires with an electric pen, one of which will definitely make the pen glow, and this wire is the live wire.

2. After distinguishing the live wire, there is only the zero line and the ground wire. To distinguish between the neutral line and the ground wire, we need to use the commonly used electrical appliances in the home, such as mobile phone chargers, desk lamps, bulbs, and rice cookers, and use light bulbs as examples to test the neutral and ground wires; If the bulb is on, it is the zero wire, and if the bulb is not on, it is the ground wire, so that the live and neutral wires are confirmed.

3. Since the zero line of the live wire is cleared, the remaining wire can definitely be used as the ground wire. Mark the wires with electrical tape, wrap the blue tape around the neutral wire, and wrap the black tape around the ground wire.

Extended Materials. Three-wire: 1. In order to make the alternating current have a very convenient power conversion function, usually the power transmission is in the way of three-phase four-wire, the three ends of the three-phase electricity are called phase wires, and the three tails of three-phase electricity are connected together and called neutral wires"Zero line"。

The reason why it is called the neutral line is that there is no current passing through the neutral line at the time of three-phase equilibrium, and then it is directly or indirectly connected to the earth, and the voltage with the earth is close to zero.

2. The earth is a good conductor, and the ground wire is short-circuited with the earth through the deeply buried electrode. The transmission of mains power is in a three-phase way, and there is a neutral wire, and the current of the neutral wire is zero when the three-phase is balanced, commonly known as it"Zero line"Another feature of the neutral wire is that it is short-circuited with the ground wire in the total distribution input of the system, and the voltage difference is close to zero.

The three phase wires and the neutral line of three-phase electricity have a voltage of 220, which will produce electric shock to people, commonly known as it"Fireline"。

3. In electrical engineering, the alternating voltage connected to the mains line is 220 volts (referred to as volts, the symbol is V), one of which is connected to the earth, which is called the "zero line", and the other line is called the live line. In electrical engineering, it is often referred to as the neutral line of fire or the one-zero-one fire.

4. The circuit switch for entering the home is generally to cut off the live wire and install a leakage protector to prevent personal electric shock accidents.

5. Under normal circumstances, the ground wire will not leakage, and the common ones are: two-hole and three-hole sockets. In general:

In the two holes, the left hole is connected to the neutral wire, and the right hole is connected to the live wire. In the three-hole socket, the upper hole is connected to the ground wire, the left hole is the neutral wire, and the right hole is the live wire.

6. The live wire is the power line that transmits electricity in the circuit.

7. The neutral line, mainly used in the working circuit, from.

There is no way to distinguish between a neutral and ground wire.

Both the neutral and ground wires are grounded. The difference between the two is only in the function, the neutral line passes through the load current or the unbalanced current. Only the fault current flows through the ground wire. For residential electricity, the zero line is separated from the household distribution box.

The easiest way to distinguish between the neutral and ground wires is to check the color of the neutral and ground wires of the home distribution box.

Electric pens are indistinguishable and have to be used with a multimeter.

In our daily life, the easiest way is to use a tester to distinguish between the live wire and the zero line. The electric tester is also called the electric tester, we generally call it the electric pen, it is an electrician tool, the resistance in the electric pen is used to prevent the current flowing through the human body, so as to avoid dangerous accidents. Today, I will talk to you about how to use an electric pen to distinguish between live wire and neutral line, and what are the uses of electric pen.

1. How to distinguish the zero line of the live line with an electric pen.

1. If we use an ordinary electric pen to measure the live wire or the zero line, put the electric pen into a section, if the light is on, it is the live line, if the light is not on, it is the zero line.

2. If we use a digital pen to measure the live wire or the neutral line, put the digital pen into a section, if the display of 220 volts is the live wire, if the display of 12 volts or 36 volts is the zero line.

Second, what are the uses of electric pens?

1. The electric pen can be used to distinguish direct current and alternating current: when we test with the voltage tester, if only one of the two poles in the neon bubble of the voltage tester emits light, and the other pole does not emit light, then it is a straight current; If both poles in the neon bubble of the voltage tester emit light, then it means that it is alternating current.

2. The electric pen can judge whether the DC is positive or negative: connect the voltage tester to the DC circuit for testing, the neon bubble does not emit light at the pole is the positive electrode, and the luminous pole is the negative pole.

3. The electric pen can be used to carry out low-voltage nuclear phase, and whether all conductors in the circuit are out of phase or out of phase: the specific operation method is: standing on an object insulated from the earth, holding a voltage tester in each hand, and then testing two wires waiting for testing, if the two meters are shining, then it means that the two wires are out of phase, and if the two meters are not illuminated, it means that the two wires are in phase.

4. The electric pen can be used to judge whether the DC is grounded: standing in the place and using the pen to contact the negative and positive poles of the DC system, if the neon bubble of the electric pen glows, then it means that there is a phenomenon of grounding, if the neon bubble of the electric pen does not emit light, it means that there is no grounding phenomenon.

1.Find the line of fire first.

The method is to close, and use the electric pen to contact the three lines to be tested respectively, and the one that can light up the electric pen is the live wire.

2.Make use of circuit breakers.

Disconnect the circuit breaker first, and connect the live wire with any of the wires to be tested. Close, observe the circuit breaker tripping.

3.Ordinary empty opening: if it trips, the line to be tested is the zero line; If it does not trip, the line to be measured is ground.

4.Leakage switch: after tripping, the reset button is prominent, and the line to be tested is the ground wire; If the reset button does not protrude after tripping, the line to be tested is the zero line.