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I agree with @Rockingit 's post regarding rings and BS1363 accessories, from a compliance point of view.
However... the arrangement where a garage is spurred from a ring final, via an 13A FCU, is not ideal in practice. I have had to deal with a few burnt out FCUs where it has been installed this way. Real world, they don't seem to be reliably up to the job.
IMO, while technically not compliant, it would actually be an improvement to protect the spur to the garage with a 16A breaker instead of an FCU. They are more reliable, and the time/current curve is very similar to a 13A BS1362 fuse anyway.
The lighting could likely be protected by the same device, without further fusing down, or the 6A breaker could be wired downstream of the 16A one.
However... the arrangement where a garage is spurred from a ring final, via an 13A FCU, is not ideal in practice. I have had to deal with a few burnt out FCUs where it has been installed this way. Real world, they don't seem to be reliably up to the job.
IMO, while technically not compliant, it would actually be an improvement to protect the spur to the garage with a 16A breaker instead of an FCU. They are more reliable, and the time/current curve is very similar to a 13A BS1362 fuse anyway.
The lighting could likely be protected by the same device, without further fusing down, or the 6A breaker could be wired downstream of the 16A one.