553-01-04 In domestic installations socket-outlets SHALL BE shuttered and should preferably comply with BS1363 for an a.c. installation.
Actually, that isn't the exact wording of 553-01-04, nor 553.1.4, and the difference is quite important.
553-01-04 said
Every socket-outlet for household and similar use shall be of the shuttered type and, for an a.c. installation, shall preferably be of
a type complying with BS 1363.
553.1.4 said exactly the same.
I don't know if the wording was changed in the last Amendment.
There is, if you care to argue it, a crucial difference between "
every socket-outlet for household and similar use shall be..." and "
in domestic installations socket-outlets shall be...", because the former admits the possibility of
usage which is not "household or similar", despite the location.
Not too hard to use that to argue for the use of a 16A 60309 in a garage to supply a welder.
A little harder to argue it for sockets in a bedroom, but not impossible?
If you use an outlet with an interlocked switch you could validly argue that the degree of safety was at least as good as that provided by a shuttered BS1363 and that therefore the departure was allowable.