Yes, in the old days fittings were pretty similar around the world. I've seen pictures from Sweden where I recognised the light switches our house had when it was built in 1914...
Blue/yellow/red seems to have been common there, though I don't really know when or how exactly... domestic wiring was usually black/grey/red as in Austria or Germany. I've seen the odd supply with above colors, though it had two Diazed fuses and a solid link for the blue wire... it was disconnected, so don't ask me waht kind of supply this might have been. It probably once fed outdoor lighting. Maybe 3 wire DC... no idea. It was in pretty bad shape, parts missing and rusty, so I couldn't really tell what I was looking at.
