Ok, I'm intrigued now. Typing as I think I guess you're thinking of fitting RCD's in each dwelling. While this will each circuit it will also trip several times a day which is a bit of a pain having to reset it, especially if it's tourists fumbling around in the dark at 2am to try and get the aircon back on.
Is there something on the market similar to a safety relief valve, which would effectively bypass any excess electric current without disrupting the main supply![]()