There is fundamental confusion about the key differences between grounding, grounding, and case bonding. At this point, grounding and grounding are the same concept expressed by the different terms used for them. There is a small difference between grounding and grounding that we will discuss in detail in this article.

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Ground rod

What is earthing

?Grounding is the connection between live parts of a machine (which carry current in normal operation) and earth such as generator neutrals or machine neutrals. star-connected power transformer. This grounding provides an efficient path of fault currents from equipment to the power source resulting in protection of electrical equipment and systems.

Grounding is also used to balance an unbalanced system. For example, all three phases become unbalanced when a fault occurs in the system, so grounding discharges the faulty current to ground and causes the balanced system to once again have a total neutral current of 0 ( this value cannot be reached in specific cases but it reduces to the near ideal case i.e. nearest value).

Furthermore, earthing provides protection against surges (lightning, line failures and surges) and excessive voltage discharge to ground making the system stable and reliable with maximum transformer efficiency.

Both AC and DC circuits in electrical and electronic engineering need 0V as a reference potential called ground, which can generate current from the source generated load side.

Simulation of a grounded system

It is not necessary to ground the neutral wire because neutral voltage may exist due to voltage drop in the power line or the two wires are used in other systems.

Note when grounding

Ground can be used as neutral, but neutral cannot be used as ground. For this reason, never ground the neutral twice (i.e. the neutral must be grounded at the end of the user or distribution transformer in a power plant or pole.

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More than one ground will create problems for the operation of overcurrent protective devices because the amount of current will not be enough to operate such protective devices.

A grounding circuit breaker is a protective device used to detect load current imbalance between hot and neutral (grounded) wires and break the circuit in the event of a fault to protect human life.

What is a ground connection

?A ground earthing connection is a connection between electrically conductive metal parts (such as body frames, metal enclosures that do not carry current during normal operation) of electrical equipment and earth (ground).

If the live wire (phase wire, heater wire) touches the metal body frame of the cabinet or control panel box and someone makes contact (by touching) the metal frame or case, he will receive a strong shock (due to the position height between the ground and the body frame) even electric shocks can result from fault currents flowing through the victim’s body to earth.

Connect the system mass with the green striped yellow wire

For this reason, a bare or green or green wire with a yellow stripe is connected between the metal body and the earth electrode (or ground rod buried in the ground) through the grounding conductor. In this way, the fault current discharges to the ground, so the earthing system protects individuals from dangerous electric shock situations.

It is recommended both for the ground connection and the connection between the outer surfaces and metal parts of the machine and the ground for additional protection. In addition, high voltage machines such as motors, transformers and generators must be grounded twice, i.e. from two different and separate locations (using separate wires and earth electrodes). separate).

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Grounding also provides a safe discharge path for lightning protection, thus making the system reliable with smooth operation.

What is housing bonding

? Housing bonding or electrical bonding is the process of connecting two electrical conductors, machines, pipes, equipment and all metal parts in electrical installations. In this process, all metal parts (which do not carry current under normal conditions) of the installation are connected through a conductor between them.

Case link

In this way, a person remains protected (from electric shock) even if he touches two machines at the same time connected to different sources. In other words, the case bond is balanced and ensures the same voltage level on both surfaces. In this way, there is no chance of current flow due to lack of potential difference, thus the system and people are well protected.

For the reason mentioned above, a well grounded bonding system is used to protect people, equipment and other installations as a grounded bonding system ensures all devices are connected. are all same voltage level, so there is no chance of discharge & flow of current.

Body link

Bonding the enclosure to ground is widely used to ensure that all conductors (persons, surfaces and products) have the same potential. When all conductors have the same potential, no discharge is possible.

Why link case is needed

Case linkage is necessary for the following two safety-related reasons..

Without case linkage, a person touching two different devices at the same time (both devices have different voltage levels) will act as equalizer and get electric shock due to the accumulation of energy between two different ends.If a live wire touches the metal body of the machine and comes into contact with a person (who is working on it) a dangerous electric shock can result, even death. machine as well as proper grounding (earth) provides protection against both the scenarios mentioned above.

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Main difference between grounding and grounding

Both grounding and grounding are almost the same, i.e. connecting an electrical device to the ground (earth electrode). This system provides a reference voltage that must be present in the circuit, to protect the installations for lightning strikes and to discharge the fault current to earth thus protecting us.

Distinguish grounding – ground connection – shell connection

Ground is a single low impedance path to discharge fault current to ground while ground is a dual path (sometimes return path for mains and source for unwanted current).

When a neutral of a three-phase unbalanced connection is connected to ground (to balance the system), it is known as Ground Grounding. Earth Breath, on the other hand, is the connection between the equipment/installation and the earth to protect against equipment and equipment damage and reduce the risk of electric shock.

Ground is the common point in the circuit to maintain voltage levels and balance unbalanced phases while ground protects the system against high voltage spikes.

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Ground is used for equipment installation and protection systems. While ground connection provides protection against electric shock and is used (to save human/animal life) as a safety measure.

At this point, you have a good understanding of the 3 cases of grounding, grounding and body connection, right? I look forward to receiving your comments and sharing s3. Sincere thanks!