When travelling in developing countries I've found a lot of hotels have plug sockets that allow for plugs from a variety of different countries to be used without adapters. Basically something like this:
In developed countries however I've never came across a place that uses this sort of thing. Its always left up to guests to use their own adapters.
I've been wondering, is there a particular reason for this? Is it possible for me to install this sort of thing in my home or are there some dangers?
Of course using US or Japanese 120v appliances in a 240v country is generally inadvisable (and vice-versa) but between two different European countries is getting the plug to fit truly the only worry?
Its particularly appealing to me in my UK house as my partner comes from elsewhere in Europe so we regularly get guests from overseas. It seems it would be a nice convenience to put some of these in the guest room.