What is a grounding wire? What does it mean to ground a wire

Most of the electricity used in life is a single-phase 220 volt power supply, and there are usually two wires at home, one is the live wire, and the other is the zero line. But we have a zero wire, why do we need to connect electrical appliances such as refrigerators, electric fans, washing machines, etc. to the ground wire?

Electricity is one of mankind's greatest inventions, and it is now indispensable in every aspect of our lives. But at the same time, electricity cannot be seen or touched. In case of electric shock, it is lucky that the current is small, but if the current is too large, it will endanger people's lives, and the "electric tiger" will eat people.

In order to ensure personal safety, people have added a third wire to electrical appliances - protective ground wire, referred to as ground wire. One end of the ground wire is connected to the shell of the appliance, and the other end is connected to the ground electrode buried in the ground.

In this way, when the insulation inside the appliance is damaged, the electricity flows from the ground wire into the ground, and people do not have to worry about electrocution. But some people may say, "I've seen a lot of electrical appliances, but I've never seen any wires connected to the ground?"

Grounding wires, instead of connecting a wire from each appliance and burying it underground. You see, most electrical jacks have three pins, one of which can be connected to the ground wire, this ground wire is installed in advance, maybe a building only needs one ground wire, and other electrical appliances are connected to this ground wire. At the same time, grounding devices are provided on the shells of general electrical appliances.

When using electrical appliances, as long as you plug in the three-pin plug, it is grounded. So, you don't seem to be grounded, but they're all connected, otherwise, would you be able to use it so safely?

But do all appliances have to be grounded? Not really. For example, the TV does not have to be grounded, because the metal parts that can be touched by people on the TV are not connected to the case, if the TV of this structure is connected to the ground wire, once the power plug is reversed, it will make the case live and cause danger.

Due to the poor insulation performance of household appliances or the humid use environment, the shell of the household appliances will have a certain amount of static electricity, and in serious cases, electric shock accidents will occur. In order to avoid accidents, a wire can be connected to the metal shell of the electrical appliance, and the other end of the wire is connected to the ground, and the grounding wire will bring static electricity into the ground and release it once the electrical leakage occurs. In addition, it is more important for electrical maintenance personnel to use the soldering iron to solder the circuit, sometimes because the electric soldering iron is charged and the integrated circuit in the electrical appliance is damaged.

Friends who use computers sometimes ignore the grounding of the main chassis, in fact, the grounding of the main chassis of the computer can prevent the occurrence of crashes to a certain extent.

Grounding wire in the power system:

It is an important tool to ensure that workers are guaranteed in the event of an unexpected voltage on equipment and lines that have been cut off. According to the ministerial regulations, the grounding wire must be. 25mm

The above bare copper flexible wire is made.

In electrical appliances, the grounding wire is a line that is connected to the shell of electrical equipment and other parts to export the unsafe charge or leakage current generated due to various reasons in a timely manner.

In layman's terms, grounding can prevent static electricity or leakage on the surface of electrical equipment from causing click damage to people. High-power appliances require special attention.

The metal conductor (generally with flat iron) buried in the soil and in direct contact with the earth and connected into a network or ribbon is generally called the grounding grid, and a certain length of flat iron is connected from the grounding network and leads out above the ground level, which is called a lead-out line. The lead-out wire is for the installation of the grounding wire. The grounding wire is the lifeline to ensure the personal safety of the staff.

The grounding wire composed of one grounding section and three short sections is suitable for three-phase three-wire circuits; A grounding wire consisting of one grounding section and four short segments is suitable for three-phase and four-phase circuits. The grounding end of the grounding wire should be fixed firmly and well connected to ensure reliable grounding. At the appropriate location of the distribution device, the joints of the grounding network should be provided for the temporary grounding wire.

The cross-sectional area of the portable grounding wire is generally not less than 10 square millimeters (when the distribution transformer capacity of a large factory is large and the short-circuit capacity of the low-voltage bus is large, the cross-sectional area of the grounding wire should not be less than 15 square millimeters). All the power supply sides that may suddenly send power to the power failure equipment should not only cut off the power supply and at least have an obvious disconnection point, but also install a grounding wire on the power outage maintenance side, that is, for the power supply, always ensure that the staff is behind the grounding wire to ensure the personal safety of the staff.

The grounding wire is to prevent the hazard caused by leakage, so as to avoid the risk of electric shock caused by electrical leakage.

The grounding wire is to lead the ground wire out to the outside through the wire to ground.

It's underground.

GND is a shorthand for the ground terminal of a wire. It represents the ground wire or 0 line. This ground is not really a ground, it is a hypothetical ground for the purpose of application, and for the power supply, it is the negative pole of a power supply.

A wire is a wire that transmits electrical energy. It is divided into bare wire, magnet wire and insulated wire. Bare wires have no insulation, including copper, aluminum flat wires, overhead stranded wires, and various profiles (such as profile wires, busbars, copper bars, aluminum bars, etc.).

It is mainly used for outdoor overhead and indoor busbars and switch boxes. Magnet wire is an insulated wire that generates a magnetic field when energized or induces an electric current in a magnetic field.

It is mainly used for motor and transformer coils and other related electromagnetic equipment. Its conductor is mainly copper wire, which should have a thin insulation layer and good electrical and mechanical properties, as well as heat, moisture, solvent resistance and other properties. Different properties can be obtained by using different insulating materials.

A wire is a wire that transmits electrical energy. It is divided into bare wire, magnet wire and insulated wire. Bare wires have no insulation, including copper, aluminum flat wires, overhead stranded wires, and various profiles (such as profile wires, busbars, copper bars, aluminum bars, etc.). It is mainly used for outdoor overhead and indoor busbars and switch boxes.

Magnet wire is an insulated wire that generates a magnetic field when energized or induces an electric current in a magnetic field. It is mainly used for motor and transformer coils and other related electromagnetic equipment. Its conductor is mainly copper wire, which should have a thin insulation layer and good electrical and mechanical properties, as well as heat, moisture, solvent resistance and other properties.

Different properties can be obtained by using different insulating materials.

There are two main types of magnet wires: enameled wire and wrapped wire. Enameled wire is made by coating insulating paint on bare copper wire, with a thin insulation layer and a small footprint, which is widely used in various electrical appliances and instrumentation. The properties of enameled wire vary depending on the nature of the insulating material used.

The main winding wires are yarn wrapping wire, silk wrapping wire, glass wire wrapping wire, paper wrapping wire and plastic film wrapping wire.

Among them, yarn-wrapped wire and silk-wrapped wire may be eliminated due to poor temperature resistance and large occupied volume. The glass filament is wrapped around the round copper wire and impregnated with silicone resin, which can withstand 180 high temperatures and has good insulation performance and mechanical strength. Paper-wrapped wire is mainly used in oil-immersed transformers.

Plastic film wrapping is made by coating a polyimide film with a certain adhesive and wrapping it around a conductor.

Its insulation layer is tough and elastic, easy to wrap and wear-resistant and heat-resistant, and is widely used in equipment such as astronautics. Insulated wire is generally composed of a conductive core, an insulating layer, and a protective layer. The wire core can be divided into four configurations: hard, soft, mobile and extra-soft according to the requirements of use.

There are four types of wire cores: single core, two core, three core and four core. The insulation layer is generally rubber, plastic, etc.

This kind of insulated wire is widely used in various instruments, telecommunication equipment, power lines and lighting circuits with an AC voltage of less than 500 volts and a DC voltage of less than 1000 volts.

【Wire Grounding】is a system.

To put it in layman's terms, the metal shell of your home electrical appliances must be grounded for fear of leakage, and in order to achieve the purpose of grounding, a wire is needed to be directly connected with the earth. In case of emergency, the electricity carried by the shell is led to the earth from the grounding wire to protect personal safety.

This is called "wire grounding".

Grounding, in the power system, refers to the use of wires to connect certain points of equipment with the earth. The function is to protect the safety of personal electricity.

In some electronic devices, grounding generally refers to a common reference site, and is not necessarily grounding in the true sense.

Generally, it should be a means to prevent short circuits and open circuits when electricity passes through the entire conductor, and damage other electrical equipment.

It ran underground when it leaked.

<><What wire is used for the grounding wire

The grounding wire is generally a multi-strand soft copper wire with a cross-section of more than 25 square millimeters, and the winding wire should never be used.

In the process of connecting the grounding wire with the grounding equipment, it is necessary to use electric welding for welding, and inserts can be inserted at the welding position to increase the welding area. In addition, when installing the grounding wire, it is also necessary to use 12 mm or 16 mm screws to tighten the grounding equipment, and galvanize and prevent rust treatment on the surface of the equipment to ensure safe use.

What to pay attention to when grounding high voltage

1. In the process of high-voltage grounding wire, it is necessary to check whether there is current in the circuit, and only after determining the power failure, the construction can be carried out, and the construction personnel need to be technical and experienced personnel.

2. When connecting the high-voltage grounding wire, the grounding end should be connected first, and then the conductor end should be connected. In the process of connection, it is not possible to entangle around, so as not to affect the later use. When placing or withdrawing the grounding wire, wear insulating gloves and use insulating rods.

3. When installing the high-voltage grounding wire, two people need to be present to ensure sufficient safety. If you are on duty alone, you can only use a grounding switch to connect to the ground wire, or use an insulating rod.

4. The cross-section of the high-voltage grounding wire needs to meet the requirements of the current, not less than 25 square millimeters, otherwise it is easy to bring potential safety hazards. And the staff of the connection needs to be an experienced master, which can avoid safety accidents, and avoid buried safety problems, so as to ensure the normal use in the later stage.

1. Earthing refers to the power system.

and the neutral point of the electrical installation, the exposed conductive part of the electrical equipment and the external conductive part of the device are connected to the earth by conductors. It can be divided into working grounding, lightning protection grounding and protective grounding.

The working grounding is set by the operation needs of the power system (such as the neutral grounding, so under normal circumstances, there will be a current flowing through the grounding electrode for a long time, but it is only an unbalanced current of a few amperes to tens of amperes). In the event of a grounding fault in the system, there will be thousands of amperes of working current flowing through the grounding electrode, but the current will be cut off by the relay protection device, even if it is a backup protection, the action is generally within 1s. Lightning protection grounding is a grounding designed to eliminate the dangerous effects of overvoltage, such as lightning rods.

lightning cables and lightning arresters.

of grounding. The lightning protection grounding will only flow under the action of lightning impact, and the lightning current amplitude flowing through the lightning protection grounding electrode can reach tens to hundreds of thousands of amperes, but the duration is very short. Protective grounding is a grounding set up to prevent equipment from endangering personal safety due to insulation damage and electrification, such as metal shells, reinforced concrete poles and metal towers of power equipment.

Protective grounding will only flow through the equipment if the insulation is damaged, and its value can vary over a wide range. When the current flows through the above three types of grounding electrodes, the potential of the grounding electrodes will increase, which will affect the safety of people and equipment. For this purpose, it is necessary to limit the potential increase of the grounding electrode or to take appropriate safety measures to ensure the safety of equipment and personnel.

2. The ground wire is a wire connected to the earth, the shell or the wire with zero reference potential in the electrical system or electronic equipment. On general electrical appliances, the ground wire is connected to the shell to prevent electric shock accidents caused by the internal insulation damage to the 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 electrocution accidents when using electronic equipment such as home appliances and offices, the protective grounding is a kind of safety grounding guard. 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 general electrical appliances, the ground wire is connected to the shell to prevent electric shock accidents caused by the internal insulation damage to the shell. The symbol for the ground wire is pe; It can be divided into two types: power supply ground wire and circuit ground wire. According to the current standard in China, when the third circuit in GB2681 is marked according to the color of the wire, it should generally be the phase wire - phase A yellow, phase B green, and phase C red.

Neutral wire - light blue, the ground wire is yellow and green, if it is a three-pin socket, the left is the neutral wire, the middle (top) is the ground wire, and the right is the live wire.

The official website shall prevail.

Grounding wires, which we can literally understand, are wires connected to the earth. The ground wire is a protective line, it can play a role in the protection of household appliances and users, it belongs to the non-working line, so this line is to use the ability of the earth to complete the protection. <>

How is it protected? We can think of the earth as an object that can absorb all electricity, the grounding wire is to connect household appliances to the earth, if the circuit is damaged, this wire will form a circuit with the earth, and the leaked electricity will be channeled into the earth, so that people will not be electrocuted. This is also the reason why the ground wire is usually thinner than the live and neutral wires.

In the process of building a house, the grounding wire is indispensable, and if this step is missing, there will be a great safety hazard. There are many high-power appliances in the home, such as computers, microwave ovens, induction cookers, etc. They are usually three plugs, there will be more high-power appliances in the office, and many of them work together, computers, printers are very high-power, and the safety risks will be greater.

Therefore, the presence of a grounding wire is very necessary.

There is another very important place that is often overlooked, and that is the bathroom. I once saw a news report that a person was taking a shower and the shower of the water heater accidentally slipped into the bathtub full of water, and the person was electrocuted to death. It sounds very simple, but it is very scary.

The water heater should be an electrical appliance that every household has, and in a place with water such as the bathroom, it is necessary to pay more attention to the safety of electricity. High-power water heaters must do a good job of preventing electric shock with grounding wires. Protect yourself and your family.

The grounding wire is an indispensable key to every building and every family, and the role of the grounding wire is also very critical.