In a circuit, can the ground wire be connected to the neutral wire? Why

The neutral wire is grounded at the transformer called the neutral line, and the voltage to the ground under normal circumstances will generally be zero or very small.

Of course, the ground wire at the user is grounded, and it is connected to the metal shell of the electrical equipment for protection.

So if you connect the two wires together, you won't see any abnormal reactions, and there won't be any serious consequences for the time being. The problem is that the neutral line may produce a voltage to the ground at some point (although it is also grounded), and although the grounding resistance at the transformer is very small, if the phase line is short-circuited to the ground, a large short-circuit current to the ground will be generated when the phase line is short-circuited to the ground, and the neutral point of the transformer will flow back to the neutral point of the transformer through this grounding resistance, and a large voltage drop will be generated on the grounding resistor, and the voltage of the neutral line (neutral line) to the ground will rise to a voltage value that may endanger the safety of life. When the ground wire is connected to it at this time (the user side), the voltage on the ground wire is the voltage on the neutral line now, and the ground wire is connected to the shell of the electrical equipment, which means that the human body will contact this part, so it will also endanger the safety of the human body.

It may not be understandable again, the ground wire is not also connected to the ground, but for the user, the grounding condition of the ground wire is generally worse than the working grounding at the transformer, that is, the grounding resistance may be greater, when the ground wire is connected with the neutral wire, it is also equivalent to the repeated grounding of the neutral wire (zero wire), of course, the short-circuit current may also be part of the grounding resistance of the ground wire from the user - the ground wire - the neutral line - the neutral point of the transformer to form part of the circuit.

However, the common result is that when the strong current passes through the grounding resistance, it produces a voltage drop at both ends, so that the neutral line to ground voltage rises and the neutral line produces a dangerous voltage, which may endanger life safety when it is contacted through the above ways.

There are different approaches in different grounding systems.

Generally speaking, the grounding wire and the neutral wire of a private house should never be connected together.

If it's connected, it's stealing electricity, hehe.

In industrial applications, as long as there is no leakage protector at the upper end, the zero ground can be connected together.

If there is a leakage protector, it cannot be connected, and the reliability of the insulation between the two must also be ensured to avoid leakage malfunction.

The neutral wire and the ground wire cannot be connected together, otherwise it is easy to have a leakage accident and affect people's lives and property safety. Usually, the neutral wire and the ground wire are connected separately, so that it is convenient to install leakage equipment and protect personal safety, so it is not recommended to install the neutral wire and the ground wire together when installing it at home.

Is it okay to connect the neutral wire and the ground wire?

Generally speaking, it is not recommended to connect the zero wire and the ground wire together, it is best to connect them separately, if the two are connected to a piece, the leakage device can not be used normally, and it can not be well protected by the rotation of personal safety, and it is easy to be dangerous in the process of use.

If the neutral wire and the ground wire are connected separately, a device like leakage protection can be installed, which can protect our lives and property. It should be noted that the ground wire is the shell necklace of household appliances, when a leakage accident occurs, if there is no ground wire, it will be easy to have an electric shock accident, and when the ground wire is connected, the leaked electricity will be transmitted from the ground wire to the underground, at this time people will not be in danger when they touch the electrical appliances.

The communication between the two will affect the normal operation of the circuit, which will cause accidents such as short circuit and leakage.

In the circuit, the circuit formed by the neutral wire is electrified, and the ground wire is connected to the metal shell of the electrical appliance.

The neutral point (neutral line) of the transformer is connected to the ground wire, which is called the protective zero; Protective zero is usually used in three-phase circuits, and it is a subversive change in the traditional understanding of the function of the zero line.

The neutral point (neutral wire) of the transformer is not connected to the ground wire, which is called protective grounding. Protective grounding is the most common for ordinary people, that is, the ground wire in our home. If it is a protective ground, the neutral wire and the ground wire behind the leakage current are connected, which may lead to leakage.

The leakage circuit breaker is only connected to the live wire and the neutral line, and the working principle is to measure the residual current, that is, under normal circumstances, all the current passes through the live wire to the neutral line.

When a part of the current flows into the ground in the electrical shell, and the current in the live wire and neutral wire is unbalanced, and the difference exceeds the set value (generally 30mA for household use), the leakage switch will trip.

Judge the line of fire and the line of zero method of recitation

If you touch one end of the wire with the screwdriver of an electric pen and hold the top with your thumb, the light will be on the live wire, and if it is not lit, it will be the neutral wire. A non-contactor electric detector can be used to determine whether it is a live wire or a live wire.

Operation method: The electric pen is close to the object with voltage, the electric pen will beep, then it is the live wire, the electric pen can measure the AC voltage of 90V 1000V. When approaching the neutral line where there is no voltage, the pen will not make any sound at this time, which proves that it is the neutral line.

Connecting the neutral wire and the ground wire together will cause great harm to personal safety and equipment safety, and the potential safety hazards are great. It is absolutely not allowed to be used.

Although the neutral wire is also grounded, it is fundamentally different from the grounding pin on electronic devices and three-position plug sockets.

The neutral ground is the circuit ground that belongs to the power supply line, that is, the power supply ground. However, the grounding pins on electronic devices and three-position plug sockets are protected ground.

The difference between them is that when the end of the neutral wire is broken or the contact is poor, the neutral wire becomes the live wire, which is electrified, and if you connect the neutral wire with the ground wire, the neutral wire converted into the live wire will transmit electricity to the shell of the equipment through the ground wire connected to it, so that the electronic equipment as a whole is electrified, which is easy to cause electric shock accidents.

And the real ground wire is only connected with the shell of household appliances, and then connected to the ground, when the electrical appliances leakage, such as the power live wire exposed core and the electronic equipment shell contact, it will make the case electrified, if there is no or no grounding wire, then when people touch these household appliances, there will be electricity through the human body and electric shock accidents, and after the ground wire, the electricity leaked to the chassis will be transmitted from the ground wire to the ground, at this time, there will be no electricity transmitted to the person when the person touches the electrical appliance, and it will not cause an electric shock accident.

Therefore, the ground wire is a protected area, which is absolutely different from the zero line and cannot be connected together.

1. The phenomenon of ground wire electrification will occur.

2. The connection between the zero wire and the ground wire will cause great harm to personal safety and equipment safety, and the safety concealment is extremely dangerous, and it is absolutely not allowed to use the wiring method.

3. Although the neutral line is also grounded, it is fundamentally different from the grounding pin on the balance filial piety sub-equipment and the three-position plug socket.

4. The ground wire is the lifeline of our life and life, if the leakage plays a role in protecting our personal safety. The zero line is loop-driven.

1. The phenomenon of ground wire electrification will occur.

2. The connection between the neutral wire and the ground wire will cause great harm to personal safety and equipment safety, and the potential safety hazards are great, and it is absolutely not allowed to use the wiring method.

3. Although the neutral line is also grounded, it is different from the grounding pin on the electronic equipment and the three-position plug socket.

4. The ground wire is the lifeline of our life, and if the leakage of the hungry brigade skin plays a protective role in our personal safety. The zero line is loop-driven.