Since the ground wire is connected to the zero line, why is the lamp connected to the zero wire but

The zero line and the ground wire are grounded, the zero line is called the middle line before the formation of the loop, and it is connected to the earth at the transformer, and the zero line is called the zero line after the formation of the loop, and the zero line may also be electrical, if the middle line of the circuit is disconnected, then the neutral line and the live wire are equal voltages.

The ground wire plays a protective role, and the voltage to the ground is zero at the nearest place of the electrical equipment. The voltage of the neutral line to ground is generally not zero. In the three-phase four-wire system, the zero wire and the ground wire can be directly connected together, but there are potential safety hazards, and in the three-phase five-wire system, the zero wire and the ground wire must be separated, otherwise the leakage will be jumped.

In the three-phase 4-wire system, the grounding wire can be theoretically spoken, but in real life, the grounding wire is not used, mainly to consider safety, if the ground is bad, then from the bad place to look at the full charge.

The neutral wire on the low voltage side of the transformer, that is, the neutral line is connected with the ground set point at the place, and the ground wire for protection grounding is generally driven into the earth with a metal body nearby, and the conduction at this distance (with the transformer) is based on the wet earth as a conductor, and its conductivity is much lower than that of the wire, and its voltage drop increases significantly when the power is very large, so it is not grounded but to be connected to zero.

First of all, you say that the ground and zero wires are the same, and I don't know what that means. The ground and neutral wires should not be connected.

Secondly, the ground wire is to prevent leakage, and the leakage of electricity is leaked into the ground, which is a protective measure, and it is theoretically connected to the earth.

Finally, the electricity we use daily is alternating current, which is actually a wire.

Do you see if the socket of the lamp is two holes?

In the three-phase five-wire, there will be a ground wire and a neutral wire, the ground wire and the zero wire are the same when the transformer comes out, and then it is not merged, the ground wire is mainly to protect the leakage, when the current flows back from the ground wire when the leakage, so that the leakage protector action to achieve the protective effect, if the line is not connected to the leakage protector, the light will still be on, but this is not safe.

The zero wire and the ground wire are connected, there will definitely be certain safety hazards, which is likely to lead to the leakage of this electrical appliance, which will pose a threat to the personal safety of the family, and it is easy to have electric shock, and the most serious consequence is to cause fire.

The zero line and the ground wire originally came out of the same piece of convergence and zero row, and of course they are connected. Later, because of different functions, they were set up separately, and the two were strictly separated and should not be mixed.

Because the working neutral line is a wire, regardless of whether it has electricity or not, it is regarded as a charged body. The grounding wire plays a protective role, when the current leakage occurs in the electrical appliance, the leakage current is introduced into the earth by the grounding wire to ensure the safety of people or equipment.

When the grounding wire introduces leakage current to the ground, it will act and cut off the power supply. Therefore, they are strictly set separately, otherwise the leakage protector will operate and affect the normal operation of the circuit.

Neutral line live:

Causes and solutions to electrification:

1. The zero line is not well grounded, if it is well grounded, the current will flow into the ground, and it will not be detected with a pen. If the neutral line is detected to be live with an electric pen, either the neutral line is broken, or the contact is not good. But this is actually the result, not the cause of the zero line being electrified;

2. Reason: Under normal circumstances, there should be no electricity on the neutral line. Therefore, once there is electricity, it must be a sign of failure; The simplest is electromagnetic induction, and at this time, the zero line is not well grounded and fails to form a loop; Secondly, the electrical equipment leaks or the phase wire touches the shell, but the current is not large, so it has not tripped; The neutral line is electrified, and the neutral wire is definitely not well grounded; After the problem is solved, go to the cause of the device.

In the three-phase four-wire power supply system, if the neutral line is not well grounded or the ground terminal is broken, the consequence is that the potential of the neutral line is not equal to 0 when the three-phase load is unbalanced, that is to say, the neutral point is offset.

The neutral wire is directly grounded at the transformer end, so it communicates with the ground wire.

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

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

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

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).

The ground and neutral wires work completely differently:

1. The ground wire is specially used for the protection of grounding, when the equipment shell is electrified, and the person accidentally touches the live equipment shell, because the resistance of the human body is much greater than the grounding resistance, then the current will quickly enter the ground wire, and only feel the electric shock, but there is no danger to life. This is also the reason why the production of the ground electrode is more stringent.

2. The neutral line is just a circuit of the AC circuit.

The neutral line is not only grounded at the transformer, but also has more than one repeated grounding before entering the house, which is necessary for electrical safety. On the total zero line, it is forbidden to set the switch. If the total neutral line is disconnected, the three-phase electricity consumption can not be balanced, at this time, the point of the zero line becomes the connection point of the three-phase load, which phase of the load is small, that is, the resistance is large, the voltage will be greatly exceeded 220 volts, causing the electrical appliances to burn out.

In this case, the voltage between the two phases is 380 volts on the surface, which does not increase, and if we assume that the voltage of each phase is reduced due to the balance of the three phases, this assumption is not true. In the three-phase four-wire system, repeated grounding is to reduce the range of accidents caused by the disconnection of the main neutral line. In reality, this kind of zero line disconnection accident, mainly occurred in the three-phase four-wire into the distribution box, is the construction personnel at that time irresponsible caused, repeated grounding measures, can not eliminate this kind of accident grounding is to connect the electrical equipment with the earth when leakage, to prevent people from touching is the danger of adopting Oh.

Neutral Ground Reason:

The zero wire is not electric when there is no load, but it is not a grounding point, so when the live wire and the neutral line are connected, the neutral line and the live wire form a loop, of course, it will be electrified, the zero wire is not the ground wire, it can not be sure that there is no voltage, the difference between the live wire and the neutral line is that their voltage to the ground is different: the voltage of the live wire to the ground is 220V, the voltage of the neutral line to the ground is 0, the middle wire is the line drawn from the neutral point of the generator or power transformer, if it is not grounded, it is called the middle line, if it is well grounded (the ground is zero potential) , the middle line at this time is also called the zero line. Although the neutral wire and ground wire of civil electricity are both drawn from the same point, their respective functions are separate and cannot be mixed.

For example, the neutral wire and the live wire are the return lines of electricity, and they are related to the shell of the electrical appliance, and the current flowing in the line is of the same size, so the wire diameter is the same thickness. The ground wire is connected with the shell of the electrical appliance, and when the electrical appliance is faulty, there is no current in it, and there is generally no current, so the wire diameter is much thinner. The neutral wire and the live wire are circuits that use electricity, so the neutral wire must not be connected to the shell, which will cause people to be electrocuted.

The neutral line is connected to the neutral point of the transformer, if the neutral point of the transformer is not grounded, when the three-phase load is balanced, the neutral point of the transformer is 0 potential, which of course has no problem, but in fact, it is impossible to make the three-phase load completely balanced, the three-phase load is unbalanced, the neutral point of the transformer will drift, that is, the potential of the neutral point of the transformer is no longer 0, so that the potential on the neutral line is not 0, this is what we often say that the neutral line is electrified, which is very dangerous. Therefore, the neutral point of the transformer must be grounded, that is, zero must be grounded.

The live wire and the neutral wire are connected together by the electrical appliances, and they are not directly connected together, and they are short-circuited if they are directly connected. The potential difference (voltage) between the live wire and the neutral wire falls on the electrical appliance, which is the voltage necessary for the electrical appliance to function properly. If there is no voltage on the appliance, it will not work.

Because the neutral line is the neutral point of the transformer and is grounded at the transformer end, the grounding wire, that is, the PE line, is connected to the earth.

Normally, the neutral wire is repeatedly grounded with the ground wire at the neutral point on the secondary side of the transformer, which plays a double protection role.

Ground Wire (PE): Not used in working circuits, only as a protective wire. Using the absolute "0" voltage of the ground, when the leakage occurs in the equipment shell, the current will quickly flow into the ground, and even if there is an open circuit in the PE line, it will also flow into the ground from the nearby grounding body (the main line is drawn from the neutral point of the transformer and repeated grounding every 20-30 meters).

The neutral line is the line drawn from the neutral point on the secondary side of the transformer, which forms a loop with the phase wire to supply power to the electrical equipment.

This is deliberately designed to be like this. It's like specifying that the current is the direction in which the + charge flows.

The neutral line is an extended ground wire, the line grounded at the neutral point of the transformer is called the neutral line, the ground wire is repeatedly grounded, and the general neutral line is not repeated grounding, and the 2nd floor is very detailed.

The neutral line is the line drawn out of the neutral point of the transformer, and the phase wire forms a loop to supply power to the electrical equipment. With voltage, electrons flow through the wires to form an electric current. It's the same as the principle that water flows from high to low.

Water does work in the process of flowing, and electricity does work in the process of flowing. When an electric current passes through a wire with a thin wire diameter and high resistance, a traffic jam may occur, resulting in heat generation. The tungsten filament of electric lamps can withstand high temperatures, and the tungsten filament emits light when it is hot.

AC power cords are divided into neutral and live wires. The neutral line is always equal to the potential of the ground (but this does not mean that the potential of the ground is necessarily low), and the live wire maintains a sinusoidal oscillating voltage difference between the neutral wire. Because there is zero potential difference between man and the earth in the natural state, under normal circumstances, people will not be shocked when they touch the neutral line.

This is the reason why you can protect people from electric shock by connecting the shell to the neutral wire with an electrical appliance (connecting it to zero).

Grounding is divided into: working grounding (in order to make the electrical equipment work normally), protective grounding (like a triangle plug), lightning protection grounding (lightning rod), grounding is to only connect a metal object or a certain point in the electrical circuit on the ground to the earth through a conductor, so that the object and the earth maintain equipotential. Prevent electric shock after human touch.

Because the voltage between the phase wire and the neutral wire of the three-phase alternator is 220 volts, the power plant directly grounded the neutral wire (neutral wire) in order to save costs.