Ask a Wire Question is a question about the ground wire of the live wire, the neutral wire

I am more in favor of the statement of the fifth floor.

First point, absolutely agree.

The second point is basically agreed.

There are only 3 wires in the socket of the switch, it is certain that there is no ground wire, there are at least 4 wires with ground wire, (it is really a black-hearted developer), and the role of the ground wire is to protect the safety of life when the electrical equipment leaks, which is very important.

The live red wire is the live wire, the blue wire is the neutral wire, and the uncharged red wire is the light wire. The ground wire is a yellow-green two-color line.

According to your description, if you use an ordinary electric pen to measure the blue wire to be electrified, I am sure that in addition to the problem with this location, there is a light on in other places in your house but it does not turn on (or an electrical appliance on the socket that is turned on but does not work). This situation needs to be solved by a more professional electrician (even a poor electrician can't check it). It's not that the landlord said that the socket with a switch is broken, and replacing this can't solve the problem.

It's time to check the zero line in your house, it's broken not far from the zero line of the main incoming line (not the total zero line, because the lights elsewhere are still working). Or the black-hearted developer in the wiring because the line is not long enough, with two wires connected, wrapped with adhesive tape, if the joint is in the wall, it is more troublesome.

Hurry up and give me extra points.

First, if you're not an electrician, don't do what the third floor says, if you're an electrician, you can give it a try.

Second, don't use an induction pen with an electric pen, not allowed, there is an induction electricity, you can't tell which one is fire and which one is zero, and the best friends to go to your house to take a look.

Third, there are two red lines, one is the fire wire, the other is the control line of the light, and the blue one is zero. If it's a builder's line, it's basically divided like this.

According to what you said, there should be no ground wire. The ground wire is generally a yellow and green line.

In practical application, you are given three wires, one is the live wire, one is the neutral wire, and one is the ground wire, if the color of the three wires is the same! How can you tell the difference?

1. The color of the phase line (L) must be red, yellow and green; The color of the zero line (n) shall be black and blue; The color of the protective ground wire (PE) shall be yellow and green.

2. Will you use a clamp ammeter to measure the live wire with an electric pen? The current of the phase wire (live wire) and the neutral wire is the same, and there is no current on the ground wire when it is normal.

3. There is a current flowing through the neutral line; The ground wire is for protection, there is no current in normal operation, only when there is a short circuit and leakage, the grounding resistance is required to be very small, and the equipment end is generally protected by the shell and grounded.

Measure the live wire with an electric pen, and place the test light (with a wire bulb) on one of the live wire and one of the other two wires, if the light is on, it means that it is 0 wire. If the light is not on. The description is a ground wire.

The test light method is effective when the ground wire is not connected to the ground, such as the ground wire is connected to the earth, then the light will be on no matter which line is connected.

4. In the case of power supply, it should not be difficult to find the live wire, the difficulty is to distinguish between the neutral wire and the ground wire, theoretically: the voltage between the live wire and the neutral wire is 220 to the right, and the voltage between the ground wire is about 190 volts. If you take an energy-saving lamp, the brightness and darkness should be visible, and the bright nature is the zero line, for reference only.

There's an easy way.

We used a test light (with a wired bulb) to put it on one of the live wires and two other wires, and if the light was on, it was 0 wire. If the light is on, the leakage switch will jump. The description is a ground wire.

The test pen is not accurate, if you have strong hands-on ability, in the case of safety, with a bulb head, two wires, for testing, with a pair of insulated rubber gloves, your home must have a leakage switch, the light is on, is a fire and a zero, flash, is a fire and a place, leakage tripped. No reaction is one-to-one. Safety first!

The three wires in the wall, without the ground wire, should be the two wires with electricity, one with a live wire, one with a neutral wire, and the one without electricity is the control wire of the lamp.

It's the builder's problem Originally, the three wires were: phase wire, yellow, green, red (choose one), zero wire is blue, ground wire is two-color (yellow-green), but now you are talking about the situation without a ground wire. Just connect the blue wire to the electric red line, n to the blue wire, l to the red line.

There is no ground wire here, the red and blue wires with fire are the live wire and the neutral wire, and the light switch control line is not electrified!

The live red wire is the live wire, the blue wire is the neutral wire, and the uncharged red wire is the light wire.

There are two red lines, one is the incoming line, the other is the light line, and the blue line is the zero line.

It's best to find an electrician to check it out.

The neutral line and the ground wire both lie in the fire

The wire is the live wire, while the neutral wire.

The difference between the neutral line and the inland wire is that the D line is directly connected to the ground, and if the electrical leakage is released to the ground through the ground wire, the zero line is used as the return route of the live wire, although it is also directly or indirectly grounded in the end, but technically speaking, the zero line is grounded at the power supply end, that is, part of the transmission line.

The fire limit will glow when the neon tube is contacted, the neutral wire and the ground wire will not, and there are only fire wires and neutral wires in the general wire, but the top one of the three-pin socket is the ground wire, which is connected to the ground to avoid electric shock.

It is best to use a voltage tester.

However, it is generally left zero and right fire. Middle ground.

1.Object: The live wire is usually bright color such as red, and it is the live wire that is connected to an air switch at the main switch;

The zero line is usually blue or black and can be seen next to the line of fire.

The ground wire can only use the yellow and green two-color wire according to the standard, because the ground wire is very important to the safety of electricity, so it has very strict color requirements, and can not use other color wires instead.

2.Representation:

The live wire is n, the neutral wire is l, and the ground wire is e.

According to the national standard, 1. Red, yellow and green: live wire (in the DC circuit, it refers to the wire connected to the positive pole);

2. Green: zero line.

Neutral line (N): Mainly used in the working circuit, the main line is drawn out after the neutral point of the transformer is grounded.

3. Yellow line: ground wire.

Ground Wire (PE): Not used in working circuits, only as a protective wire. Using the absolute "0" voltage of the earth, when the equipment shell leaks, the current will quickly flow into the ground, and even if there is an open circuit in the PE line, it will flow into the ground from the nearby grounding body.

After grounding from the neutral point of the transformer, the main line is drawn out and the grounding is repeated every 20-30 meters).

Summary. Hello dear, glad to answer for you. There is no voltage between the live wire and the ground wire, and there is no voltage between the neutral wire and the ground wire. For those who stand on the earth, voltage is generated only relative to the live wire, and the neutral and ground wires are both at the same potential, and no voltage is generated.

Is there a voltage between the live wire and the ground wire, and is there a voltage between the neutral wire and the ground wire?

Hello dear, glad to answer for you. There is no voltage between the live wire and the ground wire, and there is no voltage between the neutral wire and the ground wire. For those who stand on the earth, voltage is generated only relative to the live wire, and the neutral and ground wires are both at the same potential, and no voltage is generated.

The ground wire has no voltage, and the zero line does not necessarily have no voltage, and the section that comes out of the transformer does have no voltage, but when it comes to the user's home, we can measure the voltage of the zero line to the ground, some are a few volts and some are more than ten volts.