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.
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.
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.
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.