Electrical wiring in garage only surface-mounted?

Hello,
so I don’t know of any regulation that prohibits flush-mounted installation. Of course, the installation must be suitable. And the devices must belong to the corresponding protection class.

In which regulation is that supposed to be stated? I would be interested to know.

Regards

What kind of masonry is the garage made of? Poroton etc.? Wet room! Okay, since when does water flow into a garage? Furthermore .... then no sockets should be installed on the exterior wall either, or did the electrician not do that either *grins* Luckily, the FI was invented :-)