I've never ever seen it in the UK, but I did live in a house with a flat on a separate meter, that as it turned out was on a separate phase. I only discovered t

I've never ever seen it in the UK, but I did live in a house with a flat on a separate meter, that as it turned out was on a separate phase. I only discovered this because there was a fault on the line for only one phase, and only after checking and changing every fuse (wire), and unplugging every electrical item. Grr.