It is not allowed to install type F sockets in Belgian properties, even though they are equally safe and 100% compatible with type C and type E plugs. You can, however, occasionally encounter type F wall outlets or extension cords in Belgian web shops that have e.g. Dutch or German owners. Also kitchen units, which are often manufactured elsewhere in the European Union, sometimes have several type F plug sockets built in. Strictly speaking, this is not in compliance with electrotechnical regulations.
So why doesn’t Belgium allow the installation of type F sockets? There are probably both political and economic reasons.
Throughout the 19th and 20th centuries, Belgium looked to its neighbour France as a source of policy ideas and legislation, even if what France did was illogical in a broad European or global context. This explains why Belgium is one of only countries that standardized on the French type E socket; incidentally, it also explains why Belgium is (besides France) the only country in the world that uses the AZERTY keyboard lay-out.
The economic reason for not allowing type F sockets in Belgium is probably to protect its own domestic receptacle manufacturers and to limit competition to French firms. Other European companies currently only sell the universal Continental European type F wall outlets and are not really interested in producing type E plug sockets as well. Allowing the installation of type F receptacles would significantly increase competition for Belgian manufacturers.
Click here for a global map showing the spread of the different plug types used around the world.
Click here for a detailed list of the countries of the world with their respective plug and outlet types, voltage and frequency.