Ah, I think I get it. So if I had the transformer in the wall and only the wiring connections in a junction box with a screw plate, that would still not be enough since the transformer itself needs to be accessible and hence inside of a junction box with a screw plate accessible from the outside?
That means that any transformer that is too big to fit inside of a junction box is a no-go to begin with, am I understanding you correctly?
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