Sorry for the late reply - had to reschedule the appointment to last Sunday due to unforeseen circumstances on the electrician's side.
So it seems even electricians have their own myths/misunderstandings/old wives' tales.
Basically he was under the impression when you use the mobile charger you are using it for a continuous load for +24 hours to recharge the battery, but that's only if you're starting from 0% (plug it in everyday guys, jeez!).
When I mentioned that the mobile charger runs at the recommended 80% rating, he said that it was a "guideline", with his hands forming air quotes.
When he said that I'm reminded of what its like when a developer mentions that all their buildings are built to the fire code - well, the fire code is the minimum, so they're saying that they build their houses to the bare minimum legally required.
So his concern was running 12A on the 15A circuit and the potential heat it generates if you run it for +24 hours, which hypothetically could lead to melted insulation and a fire.
And since it seems the current thread theme is wall charger installs, here's mine.
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The first appointment was a load calculation, then they decided to go for a 50A breaker. Installation didn't include the wall charger (their office said they install a 14-50 NEMA outlet or a
customer-provided Tesla wall charger), so that was another $520.
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They were supposed to install it all on Sunday, but apparently the store he checked was out of stock of Cutter Hammer 50A breakers. So he just drilled the holes, ran the wires, mounted the wall charger, and was going to get the breaker today to install it.
Well, seems like the global parts shortage still affects me even if I already got my car, since it seems at least all the hardware stores in my area don't have any CH 50A breakers in stock.
He said it has to be the same brand as everything else or the inspection fails.
So for now there's just a 30A breaker as a placeholder till the breaker comes next week.
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When he came last week he said that the load assessment was already iffy with the sauna in the basement (which we've used only once), and today he said he'll step it down to a 40A breaker because he doesn't wanna chance it with the city inspector.
Unlabelled 40A breakers on the left are for the subpanel to the outside shed, and the unlabelled 30A breakers on the right are for the upstairs washer/dryer plugs (our washer/dryer are using the plugs in the basement).