Yes of course, but obviously when it comes to household dishwashers those parts of the grid are not terribly important and I think we already exceeded the pedantry budget enough.

> "split-phase 240V" happens at the transformer near your house, in North America. I don't know as much about the rest of the world, but I've always understood it to be ~440v split phase because it allows longer wires between the transformer and the house.

Where I live, we have three phase 480/277V for commercial. I believe that is standard in North America, but I'm not really sure.