Grounding Systems

1. Residential and Commercial Buildings (Basic Grounding)

In modern buildings, grounding is no longer just about driving a single rod into the soil.

Foundation Grounding: During the construction phase, it is done by connecting galvanized strips to the building’s reinforcement steel. This creates a large contact surface between the building and the ground.

Potential Equalization: All metal pipes in the building (water, natural gas) and elevator rails are connected to the main grounding busbar. The goal is to prevent any voltage difference between metal parts inside the building.

2. Industrial Facilities and Factories

Here the concept of “clean ground” comes into play.

Functional Grounding: In sensitive CNC machines or robotic arms, special lines free from electrical noise are installed to ensure stable and accurate operation.

Static Grounding: In facilities containing flammable materials (such as paint factories or fuel stations), all equipment is discharged to the ground to prevent static electricity from creating sparks.

3. Switchyards (High Voltage Substations)

Switchyards are locations where electricity exists at extremely high voltage levels such as 154 kV or 380 kV. At this level, a simple cable is not sufficient; a grounding grid system is required.

Grounding Mesh (Grid): A large copper network is buried under the entire area, forming square grids at regular intervals (for example, 5×5 meters).

Step and Touch Voltage Control: During a fault in a switchyard, the current flowing into the ground is so high that even the voltage difference between a person’s two steps can become lethal. This grid keeps the ground potential as uniform as possible, reducing step voltage to safe levels.

Crushed Stone Layer (Gravel): The gravel layer on the surface of switchyards is not just for appearance. It increases resistance and limits the current that can pass through a person’s body via their feet, improving safety.

4. Power Plants (Generation Centers)

In a power plant, grounding is used to protect generators, which are the heart of the plant.

Neutral Grounding Resistor Panels (NGR): The neutral point of the generator is not directly connected to the ground. Large resistors are placed in between to prevent fault current from damaging the generator.

Lightning Protection (Faraday Cage): Power plant buildings are completely surrounded with a metal cage so that lightning is directed straight to the ground without entering inside.