A double-adaptor doesn't have to carry a fuse! But a triple adaptor does...
So with a double adaptor you could potentially load a BS1363 socket with 26Amps!!
There are quite a few such anomolies in British wiring. A spur off a ring may be wired with 2.5 sq. mm cable and feed a double socket. However unlikely, it is
possible to plug two 3kW loads into that outlet and overload the spur cable. Under older editions of the IEE Regs. a spur could actually feed
two outlets in different places, increasing the likelihood of this happening.
I think the marque is 'duraplug' of a similar kind for BS1363/A, where there is a recessed socket and matching moulded fused plug.
Yes, Duraplug is the name of a whole range of rugged connectors from MK Electric (one of Britain's top electrical accessory manufacturers for decades). Are these the couplers you have in mind?
Full range of Duraplug devices here About plug derating: in the kitchen, there's a 3500w salamander and it plugs into an ordinary socket.
What on earth is a salamander?
(I have a cartoon-like image of a reptile basking under 3500W of heat lamps in my mind now!
)
[This message has been edited by pauluk (edited 11-10-2004).]