Do lightning protection grounding and protective grounding have to be separated?

Not necessarily, theoretically it should be separated, mainly to prevent the ground potential counterattack But it depends on the sensitivity of your equipment to electromagnetic interference If it is a computer electrical equipment, it is best to separate, because if it is not separated, the grounding resistance is required to be less than 1 ohm, which will be more difficult for the ground network If it is a general electrical equipment, it is not necessary to divide it as long as the ground resistance is less than 4 ohms

Lightning protection grounding: It is a grounding set up for the needs of lightning protection. For example, the grounding of lightning rods (wires) and lightning arresters is to make the lightning current smoothly introduced to the ground, so as to help reduce the lightning overvoltage, so it is also called overvoltage protection grounding.

Protective grounding: also known as safety grounding, is a grounding set up for personal safety, that is, the shell of electrical equipment (including the cable skin) must be grounded to prevent the shell from being energized and endangering personal safety.

Lightning protection grounding is also called overvoltage protection grounding, he and protective grounding must be separated, otherwise there will be safety accidents.

Lightning protection grounding and protective grounding can be connected together, but the grounding resistance must be less than 4 ohms.

Lightning protection grounding is also protective grounding, but his main purpose is to quickly discharge, safe protection of the ground, the main purpose is to cause a short circuit in the grounding, so that people can find the leakage fault in time and reduce the risk of electric shock.

Their voltage level to the ground is not the same, in order to prevent the ground potential counterattack, when there are conditions, of course, it is required to build the ground network separately better, but due to the geographical environment and other conditions of the ground network, we advocate the common ground, as long as the equipotential is handled, the problem of ground network counterattack can be solved.

From the perspective of technical measures and economic considerations, we should advocate the common land, and no one says that the lightning protection land must be independent.

It must be separated, otherwise there will be a safety accident.

It is recommended that you separate, if the lightning protection grounding and the protective grounding are put together, it is possible that the electrical appliances of the grounding wire will be damaged in the process of lightning discharging to the ground wire.

Protective grounding is the grounding of the metal shell and other abnormal live parts of the equipment, which can share a group of grounding bodies with lightning protection grounding.

What the floor said makes sense, and it is best to suggest separation, after all, safety first.

Hello dear! Glad for your question! Can lightning protection grounding be shared with electrical grounding?

It can be lightning protection grounding and electrical grounding can be connected together. However, the lightning protection down wire and the protection lead down line can not be connected to the grounding electrode after being integrated on the ground, because when lightning strikes, the lightning current will be shunted to the equipment by the PE line at the same time, and the personnel will be struck by lightning. The down conductor of the PE wire protection grounding should be connected separately with the grounding electrode, the distance between the down conductor of the PE wire and the lightning protection down conductor is as far away as possible, more than 10m is required, and the lightning current is dispersed into the ground along the lightning protection down wire, so that the lightning current will flow into the ground, and it will not spread from the down conductor of the PE wire to the equipment shell.

Summary. Hello! Lightning protection grounding and power grid protection grounding can share the grounding wire under certain conditions. Joint grounding is used in the grounding construction of large buildings, and joint grounding is to put all grounding in the building on the same set of grounding bodies.

Neutral line grounding, grounding grid practice is the same as lightning protection grounding method, grounding resistance is less than 4 ohms. If the requirements are not met, the grounding electrode should be added, and if the conditions are not good, electrolyte should be added and/or the soil should be replaced.

The working grounding and protective grounding are independently led out in the distribution room, and the system can be one. The way of working, such as the separation of the ground and neutral wires, can also be combined into one and lead to the electrical system (or equipment). The grounding system must be grounded repeatedly.

There is also an independent and separate way, the TN-S system. Ground zero can no longer be one.

Can lightning protection grounding and protective grounding share grounding wires? Why?

Hello! Lightning protection grounding and power grid protection grounding can share the grounding wire under certain conditions. Joint grounding is used in the grounding construction of large buildings, and joint grounding is to put all grounding in the building on the same set of grounding bodies.

Neutral line grounding, grounding grid practice is the same as lightning protection grounding method, grounding resistance is less than 4 ohms. If the requirements are not met, the grounding electrode should be added, and if the conditions are not good, electrolyte should be added and/or the soil should be replaced. The working grounding and protective grounding are independently led out in the distribution room, and the system can be one.

The way of working, such as the separation of the ground and neutral wires, can also be combined into one and lead to the electrical system (or equipment). The grounding system must be grounded repeatedly. There is also an independent and separate way, the TN-S system.

Ground zero can no longer be one.

Neutral line grounding, grounding grid practice is the same as lightning protection grounding method, grounding resistance is less than 4 ohms. If the requirements are not met, the grounding electrode should be added, and if the conditions are not good, electrolyte should be added and/or the soil should be replaced. The working grounding and protective grounding are independently led out in the distribution room, and the system can be one.

The way of working, such as the separation of the ground and neutral wires, can also be combined into one and lead to the electrical system (or equipment). The grounding system must be grounded repeatedly. There is also an independent and separate way, the TN-S system.

Ground zero can no longer be one. The basic principle of grounding protection is to limit the leakage current of the leakage equipment to the ground, so that it does not exceed a certain safety range, and once it exceeds a certain setting value, the protector can automatically cut off the power supply; The principle of zero connection protection is to use the short-circuit current to promote the rapid action of the protection device on the line with the help of the zero connection line, so that when the equipment hits the shell after the insulation is damaged to form a single-phase metal short circuit. The essence is to use the ground as a current loop to fix the cable grounding potential at the allowable ground potential under the conditions of normal and accident and internal overvoltage and lightning overvoltage of the cable system.

The grounding potential is not only related to the waveform and amplitude of the grounding current, but also related to the geometric size of the grounding body, georesistivity and other parameters.

This is because lightning protection grounding and equipment grounding are both grounding operations carried out to ensure the safe operation of equipment, and the grounding principle and method of both are the same. Moreover, connecting lightning protection grounding and equipment grounding together can reduce grounding resistance, improve grounding effect, and better protect equipment. Therefore, in some specific occasions, lightning protection grounding and equipment grounding can be connected together.

The difference between lightning protection grounding and equipment grounding:

Although lightning protection grounding and Kai Xibei grounding are both grounding, their actual use and operation methods are different.

Lightning protection grounding is mainly to prevent lightning strikes, reduce the potential difference between the ground and the equipment to a safe range, so as to protect the equipment from the hazards of lightning strikes. The grounding of equipment is to ensure the normal operation of equipment and reduce electrical faults caused by poor grounding.

In addition, the grounding resistance requirements for lightning protection grounding and equipment grounding are different. The grounding resistance requirements of lightning protection group Sun Shengdi are low, generally less than 10 ohms, while the grounding resistance requirements of equipment grounding are higher, generally less than 4 ohms.

The different uses and requirements of lightning protection grounding and equipment grounding determine that they cannot be used in confusion. In the actual project, the appropriate grounding method and grounding point should be selected according to the specific situation, and the operation should be carried out in strict accordance with the requirements of the specification. At the same time, the grounding resistance measurement and the maintenance of the grounding system should also be carried out regularly to ensure the safe and reliable operation of the grounding system.

Summary. I think that lightning protection grounding and electrical equipment protection grounding are set separately There is no need at all, and the use of common grounding combined with various lightning protection measures in the specification does not have safety problems regardless of electrical equipment or personnel. What's more, for a building, it is difficult to completely separate these two types of grounding from factors such as grounding practices and discharge paths.

Lightning protection grounding and electrical equipment protection grounding?

I think that lightning protection grounding and electrical equipment protection grounding are set separately There is no need at all, and the use of common grounding combined with various lightning protection measures in the specification does not have safety problems regardless of electrical equipment or personnel. What's more, for a building, it is difficult to completely separate these two types of grounding from factors such as grounding practices and discharge paths.

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