Phase/neutral inversion and electronics?

[RJVB]

Yeah, there's the question of the wiring. That said, the "internal" wiring is the same for everything I've seen (even for the few 32A breakers we have): I'd say about 7-8mm in external diameter and (almost) 2mm thick, solid copper conductors.

[sgosnell]

My knowledge of EU electrical wiring is precisely zero. Here in the US, it's easy to replace a 20 amp breaker with a 30 amp breaker, because they're the same size, and people have been known to do that if they have a 20 amp breaker that trips often. That is not to say it's legal or safe, just that it's possible. Here there are different types of what is referred to as Romex, which is routinely used for wiring houses. One should use the wiring that's rated for the intended load, and if a breaker keeps tripping the proper action is to reduce the load on the circuit, although replacing the breaker with a new one of the same size can be considered, because they can wear out and trip from loads that are below the nominal rated load. Just putting in a heavier breaker is not a good idea, because the result could be a fire.

[RJVB]

One should use the wiring that's rated for the intended load,

Or better of course...

The brunt of our hidden cabling must have been done with 3G1.5 cable, rated up to 3500W and a max. 16A breaker. That means that the 20 and 32A breakers must have been wired with heavier wiring.

And those breakers are indeed all interchangeable physically...