Creating a cable pass-through through a concrete wall is a common job during renovations, new construction, and when installing new systems. Whether you want to run an internet cable, electrical cable, or other pipes through a load-bearing wall, drilling into concrete requires the right approach and the right tools. With the proper preparation and technique, you can safely and efficiently create a perfect hole without damaging your wall.

In this article, we answer all important questions about making cable entries in concrete walls: from the necessary tools to safety tips and when it is better to call in a professional.

What is a cable gland and why do you need one in concrete walls?

A cable pass-through is a hole drilled through a wall to run cables, wires, or tubes from one room to another. In concrete walls, this is essential because concrete is a very hard and dense material that cables cannot penetrate without mechanical work.

Cable entries are necessary in various situations. When installing new electrical circuits, you need entries to route cables from the meter cupboard to different rooms. These holes are also indispensable for internet cables, telephone lines, and audiovisual installations. In kitchens and bathrooms, cable entries are crucial for connecting appliances such as extractor hoods, water heaters, or electric showers.

The alternative for the boren It is a common practice to run cables over walls using cable glands, which is not only unsightly but also poses safety risks. By creating a neat gland, you maintain the structural integrity of the wall and achieve a professional finish.

What tools do you need to drill into concrete?

To drill into concrete, you need specific tools that are powerful enough to penetrate this hard material. A standard drill is insufficient for concrete work.

The most important tools are an impact drill with sufficient power, preferably at least 800 watts. For thicker walls or larger holes, a rotary hammer is even more effective. You also need special concrete drill bits with a carbide or diamond tip, which can withstand the hard structure of reinforced concrete.

Additional supplies include a spirit level for drilling straight, a tape measure for accurate positioning, and safety equipment such as a dust mask, safety glasses, and hearing protection. A vacuum cleaner can be useful for sucking away dust during drilling, and protective sheeting protects the surroundings from dust and debris.

How do you determine the correct diameter and position for your cable hole?

The diameter of your cable hole should be approximately 20-30% larger than the thickest cable or cable bundle you want to run through it. This allows room for easy installation and potential future expansions.

For standard household cables, a 12-16 millimeter hole is usually sufficient. For thicker installations, such as main lines or multiple cables at once, you need 20-25 millimeter holes. For large vents for ventilation or thick pipes, you may need holes of up to 50 millimeters or more.

Determine the position by first checking for pipes, reinforcement, or other obstacles in the wall. Measure from fixed points, such as corners or window frames, for accurate positioning. Take into account the route the cable must follow on both sides of the wall and ensure the hole remains accessible for maintenance.

What are the steps to safely drill through a concrete wall?

Start by marking the exact drilling position and double-check that there are no pipes in the wall. Use a pipe locator or first drill a small 6-millimeter test hole to check if the route is clear.

Start drilling at a low speed to get a grip and prevent the drill from slipping. Hold the drill firmly and straight, and apply even pressure without forcing it. With hammer drills, let the tool do the work and do not push too hard.

Drill in stages and regularly withdraw the drill to remove debris and dust. This prevents the drill from overheating and ensures a cleaner hole. For thicker walls, drill from both sides towards each other to create a straighter passage. Regularly check that you are drilling straight and correct if necessary.

How do you prevent damage to the wall while drilling?

You can prevent damage to the wall by using the correct drilling technique and not applying too much pressure. Always use sharp, well-maintained concrete drill bits suitable for the type of concrete you are working with.

Drill at the correct speed for your drill type and material. Speeds that are too high can cause cracks, while speeds that are too low can dull the drill bit. Keep the drill cool by taking regular breaks and using water for cooling when drilling large holes.

Protect the surface around the drill hole with tape or a protective plate to minimize chipping. Start and finish drilling carefully to prevent tearing at the front and back. If you notice the wall starting to crack, stop immediately and consider a smaller diameter or professional help.

When should you hire a professional for concrete drilling?

Hiring a professional is advisable in complex situations, such as reinforced concrete, load-bearing walls, or when you are unsure of the location of pipes and reinforcement. Professional expertise is also recommended for large holes with a diameter of more than 25 millimeters or for multiple penetrations.

Other situations where it is better to call in a specialist are when you have no experience with concrete drilling, do not have suitable tools, or when precision is crucial for the installation. With monumental buildings or expensive finishes, you do not want to risk damage.

Professionals have specialized equipment at their disposal, such as diamond drills and dust-free drilling systems, which deliver much better results with minimal disruption. They can also assess complex situations and advise on the best approach for your specific situation.

How De Betonboorder helps with cable entries

We specialize in the professional drilling of cable entries in all types of concrete walls. Our experienced craftsmen use high-quality diamond core drills and modern equipment to:

Dust-free drilling with holes from 4 to 350 millimeters in diameter
Precision guaranteed without damage to your wall or surroundings
To work quickly and efficiently with minimal disruption
To leave the workplace tidy upon completion

Whether you need a single cable gland or multiple glands for a complete renovation, we ensure the perfect result. Contact us via our website to discuss your drilling job and receive a suitable solution within 24 hours.

How do you run a cable through a concrete wall?