Bob.Murphy wrote: USA (I believe) has 218 volts.
As far as I know the lowest level of 3-phase in the U.S. is "208V," but 400V, 415V, 480V and higher are typically available in industrial areas. However, it is uncommon here for 3-phase power to be supplied to residential neighborhoods so the next step up from our standard single-phase "110 V" is single-phase "220-240V."
The reason I used quotes is our voltages aren't as standardized as most people think. You will see our household voltage referred to as 110V, 115V, or 120V because those are common "standards" in different parts of the country depending on the transformers the local utility uses to step down from the transmission lines. Further, those are the no-load nominal voltages, which likely will be lower at the outlet when all the air conditioners in the neighborhood are on during the summer. Such variation is also the case for 3-phase voltages. Because of these variations, if you look at electrical equipment intended for industrial use you'll find a series of straps on the back that let you choose which tap of the internal transformer to use that most closely matches the actual voltage at the wall outlet.
I only have single-phase power at my house with most outlets in the garage 20A at 120V, but others are 20A at 240V, and the largest 50A at 240V. I have my 200A TIG welder plugged into a 20A 240V outlet and I use the 50A for my magneto magnetizer even though it only draws ~18A.
It may be obvious, but because of losses in the lines, drawing 20A from a 20A circuit almost certainly will reduce the voltage at the outlet so less power will be supplied than the full 240V x 20A. The wiring to my 50A outlet ensures that the voltage doesn't droop at all so that the magnetos are bathed in the maximum magnetic field (I have a separate 20A fuse at the magnetizer). My TIG is supposed to draw a max. of 15.8A at 230V so it draws only 60% of the available outlet power when working flat out. When I had the garage wired when we moved to the present house I had planned to have the electrician run heavier wiring than necessary for 20A to the TIG outlet, but he talked me out of it because that outlet is only 12" from the junction box.
My lathe was made with circuitry for 3-phase power so, short of rewiring it with new relays and such, I could have bought a phase converter. Instead I installed a large single-phase motor and a separate manual switch to reverse the wiring to the motor when I need to operate it in reverse.
But, perhaps we've drifted a bit off the topic of bronze...