So sorry, stillp - I hadn't realised that when you wrote all those things about appliances being too small to be able to contain a fuse you didn't think they were true.
Some of the small products I was involved with simply didn't have the space inside for a fuse that could break the prospective fault current
No, they were too small to contain a suitable protective device.
What about products that are designed to fulfill a task that requires them to be a certain size or they cannot be used?

Why ask me? I've never suggested that there is.Do you know of a regulatory reason why the manufacturer may not specify a fuse smaller in rating than the circuit fuse, or don't you?
Because I'd thought you might be able to answer the question I asked back in post #27.Why ask me? I've never suggested that there is.
That's often said, by various people, but can you (or anyone) back it up with a regulation or other authoritative statement?should know what an external fuse is for and it is NOT to protect the boiler or its ancillary components. It is to protect the cable.
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