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First off, instead of using bullets and then manually enumerating then, try putting "1. " at the the start of every item in the list. Don't increment the "1".
Around me the only homes without 3phases are older small apartments. Most houses have a 35A 3phase supply, although 63A may become the norm on account of EVs. It's quite normal to have a 3 phased fuse where each phase is used for something different. Say a fuse box is used for lighting and outlets, but L1 is ground floor, L2 is upstairs and L3 is outdoors.
BTW if you ever move into a house where someone has put outdoors on the same rcd as the rest of the house, then do yourself a favor and get a separate combo rcd/fuse for outdoors. When the rcd trips, it's always the outdoor usage, and it sucks when all the lights go out, because a gasket died in an outdoor lamp.
From your comments it sounds like this is Europe? In the US, 3-phase residential is rare - usually limited to large apartment buildings.
Usually what we have is a "split phase" system, where it comes in at 240v and a local ground is used to divide it into two 120v legs.
It varies by state, but some states have requiring outdoor outlets to be on a separate breaker or GFCI (RCD) outlet already, for just this reason.