The neutral ground wire has a voltage of ten V, where does the voltage come from? 30

The neutral and ground wires have a voltage of 10 and come from:

1.Neutral line resistance. As the neutral wire of the power cord, it has its length and must have the resistance value of its wire (superconducting material.

Except, the status quo civilian does not). There is no need to admit it or not to admit it, this is an objectively existing fact. If there is resistance, there must be a voltage drop, so the voltage between zero and ground ten (upper and lower) is formed from the internal resistance and ground wire of the neutral wire of the power line;

2.Zero Exotic. That is, the zero power line and the "ground wire" are not in the same condition range. Such as the general socket row.

On the "ground", the environmental parameters of the neutral ground wire are different, so there is a voltage of ten (or so) for the neutral ground wire. Back to the end.

The presence of voltage in the neutral line indicates that there is a large unbalanced current in the neutral line, and the unbalanced three-phase current produces a voltage drop on the line resistance of the neutral line. This is where the neutral line voltage comes from. Another reason is that the zero line is too thin.

Lines have a resistance value, that is, the line loss, which is equivalent to a resistance in a series circuit. The farther the user is from the power transformer used, the more users, and the larger the load, the higher the voltage to ground generated on the neutral line.

If there is no neutral wire and ground wire, the light will not be lit, so it is necessary to have a grounding wire and a neutral wire, which is the walk from the live wire to the zero wire, which is the only way for the wire.

The residual electricity from the neutral to live circuit is also the induced voltage, and the ten volts are the safe voltage.

Any wire has resistance, although the resistance of the neutral line is very small, but when the household appliance is turned on, the current passes through the neutral line, resulting in a voltage drop, the larger the total current of the household appliance, the greater the voltage drop that falls on the neutral line.

The wall screws cannot be used as ground wires, and the resistance of the wall itself is very large, so the above measurement results are not of much significance.

Both the neutral and ground wires have a voltage of 12V, indicating that there is a slight leakage in the line.

Under normal circumstances, there is no voltage in the neutral and ground wires in the home, which should be equal to zero. After decoration, the neutral wire and ground wire are equipped with a voltage of 12V, which indicates that the insulation surface of the wire is damaged or the insulation quality is not high, such as the newly renovated switch box, the moisture in the junction box has not dried, damp, etc.

In this way, there is a certain leakage resistance between the wire and the electrical appliances, although people do not feel the phenomenon of hemp electricity when they contact household appliances, which can only show that the leakage is not very serious.

Causes and solutions of neutral line electrification.

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, the neutral point is offset. The specific zero line potential is related to the three-phase load unbalance, the more unbalanced, the greater the neutral point offset, and the higher the potential of the neutral line.

The power cord is an aluminum wire or copper wire with resistance present.

The electric current in a metallic conductor is formed by the directional movement of free electrons. Free electrons collide frequently with metal cations in motion, and the number of collisions per second is as high as about 1015. This collision hinders the directional movement of free electrons, and the physical quantity that indicates this hindrance is called resistance.

Not only metal conductors have resistance, but other objects also have resistance. The resistance of a conductor is determined by its own physical conditions, and the resistance of a metal conductor is determined by its material properties, length, thickness (cross-sectional area), and service temperature.

Influencing factors1. Length: When the material and cross-sectional area are the same, the longer the length of the conductor, the greater the resistance.

2. Cross-sectional area: When the material and length are the same, the smaller the cross-sectional area of the conductor, the greater the resistance.

3. Material: When the length and cross-sectional area are the same, the conductor resistance of different materials is different.

4. Temperature: For most conductors, the higher the temperature, the greater the resistance, such as metal; For a few conductors, the higher the temperature, the lower the resistance, such as carbon.

The power cord is an aluminum wire or copper wire with resistance present.

The ground wire is a protective ground, no current passes, and it is zero potential; The neutral line is the power circuit of a 220V load through which there is a current, so there is a voltage to the ground wire. But 12V is on the high side, and I usually measure a few volts in units.

The total power supply is a three-phase power supply, and the more unbalanced the three-phase load, the greater the neutral line current. The electrician should reasonably allocate the three-phase load and try to be as close to the balance as possible.

The voltage of the neutral and ground wires should be 0V under normal circumstances.

However, in practice, because there is an impedance of the wire itself between the neutral line and the ground node, this voltage may not be an ideal 0V. Due to the difference in line impedance of different devices, the voltage between the neutral and ground wires is not a constant value.

The specific situation depends on the voltage difference measured when the equipment is working normally. As long as there are no abnormal fluctuations, some pressure differences are normal within a certain safety range.

There should be no 'normal voltage between the neutral and ground wires', they are both connected and grounded.

If there is a voltage between the neutral and ground wires [there is no normal voltage between the neutral and ground wires], it is a fault and needs to be eliminated.

There is voltage = zero between the neutral and ground wires.

If there is voltage=xv between the neutral wire and the ground wire, it is a poor grounding on the user's side.

Suspended ground is a different story.

Hello, the voltage between the neutral and ground wires is 0 volts. The main reason for the 220V voltage between the neutral and ground wires is that the neutral wire is broken, or you have swapped the neutral and live wires (mostly in the socket). A ground wire is a wire in an electrical system or electronic device that is connected to the ground, to the enclosure, or to a wire with a reference potential of zero.

On electrical appliances, the ground wire is connected to the shell to prevent electric shock accidents caused by the electrical appliances due to the internal insulation damage to the live shell. Ground wire is short for grounding device. Ground wire is further divided into working grounding and safety grounding.

In order to prevent people from electric shock accidents when using electronic equipment such as home appliances and offices, the protective grounding is a kind of safety grounding protection wire.

Questions. Is it normal for the voltage of the neutral line and the live wire to be 6 volts now?

The neutral wire and ground wire have a voltage of 6 volts normally. Because of the imbalance of the three-phase circuit, the neutral line usually has a voltage of a few volts to tens of volts, this voltage can produce a circuit through the grounding wire, that is, it can generate a current, and the working principle of the air open is to detect the unbalanced current, as long as the neutral line has a current through the ground wire to produce a loop, the current through the leakage protection will be unbalanced, which will cause the action of leakage protection.

In the three-phase four-wire power supply system, theoretically, the voltage between the "neutral point" of the low-voltage output terminal and the grounding wire should be zero, in fact, the three-phase load at the low-voltage end is not absolutely balanced, so there will be a potential difference between the neutral line and the "neutral point", and the more unbalanced the three-phase load, the greater the voltage opportunity.

There is no specific regulation, if the neutral wire is not grounded, the corresponding ground wire has a certain voltage, and the voltage size is also uncertain.

Under normal circumstances, the neutral wire and the ground wire have no voltage.

If both your neutral and ground wires have voltages, it means that your neutral and ground wires have poor grounding effects.

The starting end of the neutral line is the neutral point of the transformer, which is the working grounding, and if the grounding is reliable, the ground wire can ensure that the neutral line voltage is the same as the ground voltage (the ground voltage is zero volts), and the poor grounding will cause the neutral point (i.e. the neutral line) voltage to shift.

As for the ground wire also with voltage, it must be that the grounding effect of the ground wire is not good.

The ground wire of electrical equipment has an induced voltage that cannot be released to the ground through the ground wire (the ground voltage is zero volts), causing the terminal ground wire to become electrified.

It is normal that the zero line is connected nearby, for example, there is a grounding flat steel in the electric well, the resistance of the ground wire is very short from the electric well to the indoor distance, and the zero line is connected from the substation, the distance is very far, the resistance of the line is long, the resistance of the zero line will be large after the power is on, the resistance of the zero line is greater than the resistance of the ground wire, so the voltage will be generated between the zero line and the ground wire, but the voltage is very low, generally only a few volts, if the zero line is disconnected, and the electrical appliances are used indoors, then the zero line will be electrified, The voltage to the ground wire will be as high as 220V, which is very dangerous, which is commonly referred to as tempering.

The earth's earth is specified as 0 potential, which is the reference potential, and the so-called zero line is the middle line of the three-phase line, if it is not grounded, it should have voltage to the ground.

The normal voltage between the neutral and ground wires should be 0V.

However, in practical application, because the three-phase load of the transformer cannot be absolutely balanced, the neutral point (zero potential) will be offset, and the neutral potential is no longer 0, and the voltage between the neutral line and the ground wire is not equal to 0 at this time.

The generation of 0V voltage is relative, you can think of 220V as a battery, the positive electrode as the live wire, the negative electrode as the neutral line, the negative electrode is in good contact with the earth, and the ground wire is also in good contact with the earth (the earth is a good conductor).

There are several scenarios for you.

1. The grounding system of your home is IT or TT, although the common one is TN grounding system, but some areas such as Shanghai and some communities are using TT grounding system. It may also be that the ground wire in your home is not connected to the poor contact, and the result is that your home itself has become a TT grounding system. This situation has a high probability, and does not affect the daily use of various electrical appliances, and there is no electric shock when touching the electrical shell.

2. Open the ground line into the house.

Poor contact, which is extremely unlikely. Because this situation will inevitably be accompanied by leakage tripping.

3. The ground line of the residential unit is open. For TN systems in most regions.

The simple way to judge is to disconnect the main switch in the house, measure the voltage resistance of the zero line and the ground wire, the normal situation is that the voltage of the zero line and the ground wire is 0, and the resistance is very small, which is similar to a short circuit.

Conductive.

It is a single-phase neutral line, it may be that the neutral line is too thin and long, the line resistance increases, and the measurement point to the neutral point seems to be the same resistance, and this voltage is the voltage at both ends of this resistor.

Under normal circumstances, there is no voltage in the neutral ground wire! Only when the neutral ground wire is in poor contact or disconnected, there will be voltage on the neutral ground wire!

It is likely that the zero line has a hidden danger of poor contact, or there is a disconnection!

Because the load of the live wire is only formed by the zero line, because there is a problem with the zero line, the voltage on the live wire is generated on the zero line after the load is stepped!

We often encounter this situation, the electrical appliance can work normally when connected to the power supply, but the shell of the device feels numb to the touch, and the voltage can be measured between the neutral wire and the wire, what is going on? Let me take you through that.

The ground wire is used to protect the wires, so that even when we supply electricity, the current leaks out and will not be released to the earth. The voltage of the neutral line may be due to the poor contact of the circuit inside, and it is recommended to change to a new neutral wire.

The ground wire is used to prevent the leakage of the shell, and the zero wire leaks to the voltage when the equipment is electrified, and it may be that someone uses the ground wire as the zero line, which generates voltage. This is very dangerous, if the home is installed with a leakage protector, we should not use the ground wire, and the ground wire is insulated.

Second, how to protect wires and cables.

1. Usually the outer skin of the wire should have a flame retardant effect, and its insulation and temperature resistance must also be very good, which can protect the wire, prolong the service life of the wire and ensure the safety of people.

2. The wire must also have the ability to withstand pressure, will not be easily broken and deformed, and can quickly return to its original state after being stepped on without damage.

3. The temperature range of the wire must be larger, because the wire is used all year round, and the temperature changes greatly due to seasonal changes. Wires must be able to adapt well to changes in the environment.

4. The environment in which the wires are placed must be reasonable, not in a place similar to water or easy to be stepped on, and it is best to put it in a hidden place.

5. Choose a regular manufacturer when purchasing, so that the quality can be passed and after-sales service can be provided.

I concluded: there is a voltage between the neutral wire and the ground wire, which is very dangerous, and we must deal with it in time to insulate the ground wire. Maintain the wires as soon as possible, check them in time, and find problems early, so that we can solve them as soon as possible.

This extends the life of the wires and ensures our safety.