Is that true - I hadn't noticed! However, I don't think it's non-compliant with BS7671 to employ a higher degree of protection than the Standard mentions. I also rather doubt that BS7671 'over-rides' it's brother BS1362 - which, AFAIAA, still recognises 1A fuses!
... as, I would imagine, would virtually all of us. In fact, I'd be interested to know if anyone has ever seen an installation in which all of the lighting 'transformers'/PSUs were fed via FCUs?
Well, I did browse it and, as I wrote to yorkspark, hadn't noticed any restriction to 3A, 5A and 13A for BS1362 fuses. 533.1 and 533.1.1.2 appear to be saying that any fuse compliant with BS1362 is acceptable and, as I said, AFAIAA, 1A (and 10A, and possibly other) fuses still exist in BS1362 (as well as 3A, 5A and 13A ones) - I certainly have plenty of 1A fuses with "BS1362" written all over them!
Or a very rapid nothing at all except the smoke being let out of the device.
Yes, I should have added that - which, in practice, may well be the most common scenario. However, as I'm sure you understand, my point remains - that a fault resulting in a persistent fault current which is high, but not high enough to result in very rapid operation of an OPD (probably by magnetic tripping) is a pretty (probably very) rare animal.
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