4mm TE cable supports a 30 amp radial.
Not with rewirable fuses.
Not getting this comment, BAS
I'm not having a go, I just don't get what you are trying to say.
4mm cable won't carry 30A because it's overload protection is via a 30 A fuse?
A 30 A fuse can't protect 4mm cable from overload? - but it can protect a 2.5mm ring final?
If a 32 A MCB is suitable overload protection for a 2.5mm ring final
or a 4mm radial, then it stands to reason that if a 30 A BS3036 is suitable overload protection for a 2.5mm ring final, it must be suitable for a 4mm radial.....
...or do you know something I don't?
I've never actually done the calcs, but does the fusing factor affect the 4mm radial, but not the 2.5mm ring final?