On Friday, 23 March 2018 13:37:35 UTC, Andy Burns wrote:
whisky-dave wrote:

But according to regulations in the UK on changing fuses it should be either a 3A for below 720W or a 13amp for above 720W .

https://www.rospa.com/home-safety/uk...hoosing-fuses/

ROSPA doesn't represent "regulations", it's just advice, based on the
ratings of fuses they expect people to have at hand, and even that page
suggests 5A for some appliances ...

As I said it's a bad question and in this university we have the regulations which tell us we must only use 3 & 13amp fuses, about 10 years ago I and others had the job of checking all fuses and replacving them with the 'correct ones'
i.e 3 or 5, this is one reason why I have dozens of 5, 7 and 10 amp fuses, I even have 1 amp and 2 amp that I used in angle poised lamps with 40 or 60w bulbs.
ANd don;t forget the FUSE is to protect the cable NOT the item of equipent so it really doesnlt matter what current rating the electric fire is, you put the fuse in that is correct for the cable.