Si:
4. This is different in the house wiring (behind the walls) where the colour (color) scheme is red for live, black for neutral an bare copper for earth.
Not any more it isn't. You'll still find it in houses but it was phased out a few years ago.
Edit: just to clarify I mean in the UK. We're now the same as the rest of europe in that house wiring is the same as consumer wiring.