This question is purely for curiosity's sake...

I've searched all over the internet, but get conflicting information. Is US mains power supposed to be 110v (220v if pulling from both sides), or 120v (240v if pulling from both sides).

I remember hearing somewhere that it's really supposed to be 110v, but there's conflicting info all over the place. I doubt it really matters for most appliances, but I'm very curious.