Reliable grounding is one of the most important elements of any electrical system, ensuring the safety of people and the proper functioning of equipment. A key role in creating a grounding circuit is played by steel strip, which serves as the main conductive element. Let's consider its purpose, the different types of such strips, and how to choose the right grounding material.

⚡ What is a steel grounding strip?

Steel strip for grounding A grounding conductor is a rectangular metal element made of structural steel (most often grade St3). It is used as a conductor between the elements of a grounding circuit: ground electrodes (pin electrodes), connecting bolts, and busbars within an electrical installation.

Typically the strip has a width of 25 to 50 mm, thickness 4–5 mm and can be supplied in coils or pre-cut lengths. Its shape ensures tight contact with the ground and good current distribution during discharge.

⚙ Main functions of steel strip

Connecting ground electrodes into a circuit - forms a continuous chain connecting all elements of the grounding system.
Short-circuit current diverter - directs dangerous potential into the ground, preventing electric shock.
Potential equalization - reduces the risk of potential differences between parts of the equipment.
Improving the safety of electrical installations — protects equipment from overvoltage and lightning strikes.

🔩 Advantages of using steel strip

High mechanical strength — withstands mechanical loads and does not deform during installation.
Reliable passage of current - low current resistance due to tight contact between the elements.
Durability — with proper corrosion protection, the service life is 20–30 years.
Versatility — suitable for grounding systems of buildings, enterprises, substations, power lines.
Accessibility and ease of installation. — steel strip is easy to weld, bend and connect with other elements.

🧱 Types of steel grounding strips

1. Plain (black) steel

Used in traditional grounding circuits. The main drawback is susceptibility to corrosion during prolonged contact with the ground. Therefore, such strips are mandatory. are covered with anti-corrosion layers (bitumen, varnish, zinc paste).

2. Galvanized steel

Zinc coating provides rust protection, extending service life to 40–50 years.
🔹 Ideal for outdoor systems where the strip is in the ground or exposed to moisture.

3. Hot-dip galvanized strip

The coating is applied using a hot dipping method, which ensures a uniform zinc layer and maximum resistance to aggressive environments.
Used in industrial and critical facilities (power lines, substations, tank farms).

4. Copper-plated steel

The surface is coated with a thin layer of copper using galvanization. This combines high electrical conductivity of copper And strength of steel, which is especially important for lightning protection and high-voltage systems.

📏 How to choose the cross-section and dimensions

The choice of strip sizes depends on:

Type and power of electrical installation;
Soil resistance;
Lengths of the grounding loop;
Required grounding resistance (Rз).

For private houses and small properties the following are usually used:

Strip 25×4 mm — for residential and office buildings;
Strip 40×4 or 50×5 mm — for industrial facilities and lightning protection systems.

📐 Important: the larger the strip cross-section, the lower the current resistance and the higher the discharge diversion efficiency.

🧰 Installation of steel strip

Installation of the grounding circuit is carried out in several stages:

Preparing a trench (depth 0.5–0.8 m).
Laying steel ground electrodes (pins) and connecting them with a strip.
Welding of all joints - ensures minimal transition resistance.
Checking ground resistance devices.
Processing of welding areas anti-corrosion compound and backfilling the trench.

For internal connections inside the building use bolt fastening using clamps and splints.

🧪 Corrosion protection

Since steel actively interacts with moisture and soil electrolytes, it is recommended:

apply bitumen coating to areas located in the ground;
use galvanized or copper-plated strips in places with high humidity;
Avoid contact with other metals (aluminum, copper) to prevent galvanic corrosion.

⚙ Advantages of using steel strip in grounding

Provides low resistance to current spreading;
Allows create a closed loop any form;
Easy to install and affordable;
Lasts for decades with proper protection;
Resistant to mechanical and thermal influences.

⚠ Disadvantages

Requires regular inspection of condition and possible touch-up painting;
Without protection, it quickly corrodes in an aggressive environment;
Not suitable for particularly wet and chemically active soils without zinc or copper coating.

💡 Conclusion

Steel strip for grounding — is a reliable, durable and economical element of the electrical safety system.
It ensures stable contact between grounding elements, protecting people and equipment from electric shock and overvoltage.

👉 When choosing, it is important to consider the type of coating, thickness, operating conditions, and electrical design requirements.
A properly installed and corrosion-protected strip will last for decades, ensuring the smooth operation of the grounding system.