How to distinguish between a live and neutral line? How to distinguish the zero line of fire

When energized and measured with an electric pen, all the bright ones are the live wires, and the dark ones are the zero wires

When you are powered on, you can use an electric pen to measure, and all that will light up is the live wire. Disconnect the zero line at the main switch, only connect the live wire, turn on the lights at home in the position of on, measure with an electric pen, just now it is not lit, now it is all the zero line, and the rest is not lit all the ground wire.

After determining the live wire with an electric pen, connect two bare wires and live wires to the 220V bulb respectively, and you can distinguish the neutral wire and the ground wire from the brightness. The bright one is the zero line, and the slightly darker one is the ground line.

The method of testing the live and neutral wires with an electric pen.

1.Touch the metal part of the back end of the pen with your fingers.

2.Insert the pen into the jack so that the metal part of the front end of the pen is in contact with the metal part of the jack as much as possible.

3.Check the number of volts displayed on the electric pen display, if it is displayed as 220V, then this jack is the live wire port; If there is only one lightning symbol, it means that it is weak current, and this jack is a neutral line port.

There are three ways to identify: tester.

Wire color, symbol.

1. In the normal circuit, the live wire can be lit by the electric tester, but the neutral line will not;

2. If the color line is used to divide, usually the red line is the live line, and the blue line is the zero line;

3. If it is represented by symbols, L represents the live line and N represents the zero line.

Usually in the control circuit, the wire that enters the switch is the live wire.

You don't need to test the electric pen, you can use it all with your eyes**.

1. Indoor open line, the upper line is the fire line, and the lower line is the zero line.

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

3. Judging from the wiring of the lamp head, the spring piece is the live wire, and the Rose buckle is the zero line.

4. From the light switch, the wire connected to the switch is the live wire.

The ways to distinguish between the zero line and the live line are:1. Look at the color of the wire: the red line is generally the live line, and the blue line is generally the zero line.

2. Use an electric pen.

Measurement: The electric pen will light up the live line, and the non-light will be the zero line.

3. Look at the letter representation: if it is the letter L, it represents the live line, and if it is the letter N, it represents the zero line.

4. Multimeter.

Measurement: The large measured value belongs to the live line, and the small measured value belongs to the zero line.

We can use an electric pen to test the neutral line of fire. The neutral line is not energized. The live line pen light will come on. You can also use a multimeter, which is more cumbersome.

1. Distinguish from the color.

The color of the line of fire (l) shall be red, yellow, 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.

Second, the electric pen test.

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 connect 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.

3. Use a leakage circuit breaker.

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.

Fourth, test with a light bulb.

Take a 220V bulb, use an electric pen to determine the live wire, and connect two wires and live wires to the lamp head, you can distinguish the zero line and the ground wire from the brightness, the bright one is the zero line, and the slightly darker one is the ground wire.

Fifth, use a multimeter.

Put the multimeter in the AC file 500V, pinch a meter pen, and touch the power cord with the other meter pen 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.

1.Color judgment: red is the live line, the zero line is green or blue, the ground wire is two colors together, and the common ones are yellow and green2.

Electric pen test: electric pen one end of the wire, the electric pen is bright is the live wire, not bright is the zero wire or ground wire, with the light bulb of the wire test ground wire or zero line, the bulb is bright to eliminate the live wire, the other is the zero line, the bulb is darkened and the other is the ground wire;3.Test with a multimeter.

If you want to distinguish the difference between the zero line and the live line, it is actually very easy to distinguish, the zero line is generally blue, and the live line is generally red.

The neutral line of fire is easy to distinguish, and the general line of fire is red or yellow.

If you divide the zero line and the live wire, then you have to only measure the electric pen with the electric meter, if the electric pen is the amount, it means that this wire is the live wire.

This zero line and the live wire should be easy to distinguish, you can use a voltage tester, if the plug-in pen has a light on, it is the live wire, if there is no light on, it is the zero line.

In fact, they are very good to distinguish between the zero line and the live line, under normal circumstances, the zero line is blue, and the live line is red, so it can be distinguished according to the color.

Generally speaking, the neutral wire is not electrified, and the live wire is electrified, so you can use an electric pen to measure.

It's very simple, this is marked with different colors of red is the line of fire, black is Linxian, and there is a cyan ** is the bottom line, is it the kind that is grounded? In fact, if you don't feel that you can't distinguish it, you can distinguish it, and you can measure it, and there is another way, which is 85 to touch it lightly with your fingers on your arm, if it is a change to hit it, then it means that it is the line of fire, which is the most practical way.

Looking at the color of the line, generally red is the live line, and blue is the zero line.

Distinguish between the zero line of fire, which can be measured with an event ratio, or it can be a normal circuit, which is God, left zero and right fire.

The color of the neutral line and the live wire is not the same. The line of fire is generally red in color.

Distinguish between the neutral line of live wire, which is generally connected to the left neighbor, and the middle ground and left are the live line and offline.

If you want to live wire, then basically by the color of the wire, the live wire is red, and Mr. Lin is black.

For how to distinguish between the zero line and the live line, we generally have to use the electric tester at this time. After testing, the neon bubble is bright, and the line of fire is bright.

In fact, he should have a color or use left and right to distinguish it, and you should ask an electrician or a physics teacher specifically, because they specialize in this aspect.

How to distinguish the zero line of fire, you can see its color to distinguish the zero line.

The neutral wire and the live wire have a physical line connection in series.

How to distinguish the zero line of fireThis distinction is more obvious, under the professional staff, he will look at it, because the color of the line is not the same.

How to distinguish the zero line of live wire can be sucked out with a pen? There is no electricity offline, and there is power in the live wire.

Oh, I remember when I was in high school, I studied Linxian and Mars temporarily, and the closed line of fire is not like a mouthful.

Liu Qian and the line of fire are not the same color, so it is good to distinguish him.

This needs to be distinguished by professionals, don't operate blindly.

3 wires are the same color, how to quickly distinguish between the neutral wire and the ground wire? The old electrician teaches you a trick.

There are three ways to distinguish: electric tester, wire color, and symbol.

1. In the normal circuit, the fire line can be used to shield the hail, but the zero line will not;

2. If the hall is divided by a color line, usually the red of the macro segment is the fire line, and the blue line is the zero line;

3. If it is represented by symbols, L represents the live line and N represents the zero line.

Usually in the control circuit, the wire that enters the switch is the live wire.

Line of Fire (L): Red, yellow, green must be used.

Neutral line (n): black and blue must be used.

Ground wire (PE): Yellow and green two-color wires are required.

It is usually the contact of the circuit, such as the wire joint, switch terminal, socket of the terminal post of the screw wire end is loose or poor contact, there is a large contact resistance, with a multimeter can test the voltage, because the current required by the multimeter is very small, but when connected to the bulb and other loads, the contact resistance of the contact can not pass through the larger current. In particular, the electrical power consumption in the kitchen is large, and there are higher requirements for the firmness of the high cherry joints of the lines, and if the joints are loose, there will be thermal oxidation of the threads, resulting in the circuit not being energized. It is recommended to check whether the terminals and terminals of the mold are connected reliably.

In particular, the wiring of the main switch and the insurance box of the Baozu rental mountain.

Line of Fire (L): Red, yellow, green must be used.

Neutral line (n): black and blue must be used.

Ground wire (PE): Yellow and green two-color wires are required.