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I always think home voltage in the UK and about have world home voltage 220 volts in the children bedroom.
From what I understand that 220 to ground. 2 wires off pole. { Back 1920s LA used 220 volt 50 Hz or 120 volt 50 Hz from the stories I been told. }
We use 120 to ground and 3 wires off the pole.
Slowly most countries are switching to 110 or 120 volt for home uses and only a stove and or big ac use 220/240 volts.
Dave

In the UK the power is 240V, 50Hz.? Outlets are often wired in a ring,
not just one linear connection.

Here we have 220V, 50Hz.? On the poles is 3 phase WYE, so 220V from any
leg to the common and 380V from leg to leg.? A typical dacha (small
"country house") is connected to one leg and the common with a 25 amp
breaker and RCD (like a ground fault breaker in the usa). That's all the
power you get.

Because of a series of murky events, we got all 3 phases so have 3 phase
power for the workshop, our sauna, and the greenhouse heater.

Wiring up the milling machine to 380 volts seemed odd, at that voltage
it only has a 5 amp breaker (well, three 5 amp breakers ganged together).

I'm still getting used to how thin wire is here, things use half the
current and with the higher voltage can stand a greater voltage drop,
hence thin wire.

One problem with 50Hz is motors and transformers need 20% more iron in
them, making them bigger and more expensive.? In appliances like washing
machines you'll find brushed motors instead of the induction motors the
usa uses.? Our refrigerator has a tiny brushless DC motor (3 phase with
VFD) as we use propane/butane for refrigerant instead of the
fluorocarbons we had in California.? Propane/butane is more efficient
and much lower pressure so refrigeration gear is pretty low power.

If we were doing power systems over, probably something like 240 Volts
at 100Hz would be good.? It would certainly save a lot of iron and
wasted wattage.? But, at least we're not in the part of Japan where I
hear they have 100 Volts and 50Hz, worst of both worlds.