Hi to everyone in here!

I'm a Newbie from Germany and I've been
wondering about all these transformers
I've seen in many code violation pics.

I'm not very used to the PoCo systems in
the U.S., and I'm just curious what the
purpose of all these transformers could be?

Or, asked the other way round, how does
electricity come to you in the "normal"
houses (eg single family house)? Which voltage/current and how many live and neutral wires?

In Germany, electricity normally comes in
3 live wires and 1 neutral wire, 230V between
live wires and neutral, 400V between 2 live
wires. Mostly 80A each live wire. And I'm
just curious how's it done in the U.S.?

Greetz from Hamburg
kmt