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AFAIK (and i could be totally wrong here; 3 phase is where my knowledge of electricity takes a sharp dip!) you can get up to 480V total on a 3 phase circuit in the US… 3 phase is what a lot of dedicated car charging circuits would run off
i had heard that US properties get 3 phase power by default and a lot of your circuits are split between the phases, where a lot of 230/240V countries get a single phase, and that you have certain 240V circuits for speciality things like clothes driers that operate somehow using multiple phases at once? or that could be total nonsense misremembering
… but also, houses in 240V countries (i’m in australia for example and we have 240) can also get 3 phase, and that’s often what’s added for electric vehicles
You can get 3-phase in the UK, but it's very much down to what's available in the street.
And you're definitely getting into commercial pricing for the install when you call the electric company.
Most of the time, home chargers are just up-rated cables from a standard single-phase supply (most houses are 100A or 60A, so 30A for a car isn't insane, while giving 7.2KWh)