If Italy is anything like Spain nobody gives a crap about building code stuff.
When I moved into my apartment it had just been "certified" by an electrician which took a week. There were outlets without covers on them. Exposed live stripped wires hanging in the hallway. Ground wire to the breaker box but not actually connected to the rest of the house. Exposed terminal blocks hanging everywhere. I doubt this "professional" even bothered to visit the place and just cashed a royal fee to sign the paperwork.
It's a total joke. If this crap gets "certified" then a DC cable beside an AC one In a conduit is really no issue :)
I know HN frowns upon this but location really matters, and op's response is valid and non-laughing in many places. "Certification matters" cannot be resolved as a statement without location / situation.
If I reported such a situation in Canada, it may or may not have satisfactory official resolution before heat death of the universe. One can hope.
If I reported such a situation where I was born, at best nothing would happen ; more likely I would get laughed at. (At worst, electrician and their 3 buddies would teach me a valuable lesson about how things work around these here parts).
Maybe he did report them and maybe their license wasn't revoked. He's only repeating a joke that the electrician and the certification committee told him. I wouldn't blame the victim, here.
When I moved into my apartment it had just been "certified" by an electrician which took a week. There were outlets without covers on them. Exposed live stripped wires hanging in the hallway. Ground wire to the breaker box but not actually connected to the rest of the house. Exposed terminal blocks hanging everywhere. I doubt this "professional" even bothered to visit the place and just cashed a royal fee to sign the paperwork.
It's a total joke. If this crap gets "certified" then a DC cable beside an AC one In a conduit is really no issue :)