Which empty conduits are used for garage connections?

Hello forum,

the construction of a double garage has already begun for me. It was agreed with a construction company that the pipework would be done. The strip foundations (approximately 1m deep and 60cm wide) have already been made with reinforcement cages. The floor slab (approximately 15cm) is still outstanding.

Now (unfortunately) I noticed that the contractor has not yet planned for the electrical installation introduction. Likewise, it is my oversight not to possibly provide a conduit for a water pipe in the garage. However, this will no longer be possible due to the strip foundations and frost depth.

The electrical installation, on the other hand, should not yet be a problem since the floor slab has not been poured yet. The strip foundation itself will also be extended approximately 20-30cm in height. So, I also have some leeway there.

My question: What kind of conduits are generally used for outdoor electrical installations? The double garage is about 15m away from the house. Would you use 100mm KG pipe or these flexible cable protection/corrugated or installation pipes? How deep is it recommended to bury such an underground cable in the garden?

100er KG, with that you're always on the safe side... I would definitely go 60 deep. If shallower, then you have to remember exactly where it is so you don't hit it while digging...

110 is not bad. Although 75 would certainly also work.

However, due to the length, I would definitely install two cleaning pipes (the ones with the rectangular covers) and then, of course, remember the spot well so you can find it again.

For bends, don’t use 90-degree pieces, but preferably ones with 15 degrees.

Just don’t use corrugated pipes. You get stuck on every little unevenness (and there are enough of those over 15 meters) when pulling it in.

Is it also about water? Then frost-free at least 80cm deep, depending on the region Your shell builder knows that though

Thank you. I have now used 110mm KG pipe. It goes about 80cm deep to the foundation. Then I chiseled the foundation a bit with the Hilti and built it up with 2-3 30mm corners. I am only about 30cm deep in the foundation. That means the pipe goes only about 30cm from the soil up the foundation and is only 30cm deeper in the concrete where the soil ends. So not ideal, but at least.