As you go on to mention middle, we can be pretty certain that you mean a "Ring FC" -Dad's garage had a C16 for the welder on the RFC
plus, of course for some inexplicable reason in our bizarre world, it does not stand for "Radial FC".
Why not?- mounted on a metal box with a C16 MCB in it. Not regs compliant,
Of course.but if you apply logic and electrical knowledge then you'd have to agree that it was perfectly safe
Yet the assumed 2.5mm² conductors of the ring and spur have a CCC of 27A so to all intents and purposes it did not matter where on the ring it was and the C16 was being used solely as a low current limiter.(it was a short RFC, and the C16 socket would be not far of the middle of it).