Both.
Electrical systems here seem to be a lot better than the states, both in homes, and the infrastructure - cascading failures for example are unknown here.
Makes sense though to
ALWAYS double check, you can't usually see where the wires go, and you never know if that particular area you're working on might just have been wired in some weird and wonderful fashion
It's actually 240V here (nominally 230V across the EU, but we're still 240 and the rest are still 220
) - basically equipment has to be made for 230, and be happy at >240 and <220.
Single phase here with 3 phase distribution, and alternate houses connected to alternate phases to spread the load evenly.
I don't know as 240V is much more dangerous?, there seems no shortage of deaths in the USA from 110V