ᐅ Installing Electrical Wiring on Interior Walls and Floors

The electrical cables should be installed at the same level as the underfloor heating (i.e., embedded in the screed) to save space in the floor construction. There is no additional installation layer.

The underfloor heating supply temperature is only about 25°C (77°F), so it should not get too warm.

Can I safely run the electrical cables along the base of the interior wall so that the underfloor heating pipes are located in the center of the room and both cables do not have to cross? It would look like this (the squiggly lines represent the electrical cables, and the turquoise area is the underfloor heating):

One more question: The electrical cables then run to the sub-distribution board, which is installed in a lightweight partition wall. The wall should still be open (not covered) to allow access, right? How is the sub-distribution board mounted in this case? Do drywall installation and electrical work need to be coordinated closely?

Ok, I called the electrician... He suggested routing the wiring within the insulation layer and had a good idea how to do it. I will proceed that way.

Regarding your underfloor heating, I’m rather skeptical that 30 cm spacing and a 25°C (77°F) supply temperature will work and that you will achieve this flow temperature.

Hmm, I still think so..
We basically have heating loads at Passive House level (10-20 W/m² (0.93-1.86 W/ft²))