When I first moved to the UK, ring circuits seemed a bit unusual, we only use radials in Canada in house wiring. Although ring finals seem to have a lot of benefits, I don't think they would be legal in Canada with a 2.5mm cable because you cannot use a 32A breaker to protect a cable rated less than that. Although there are 2x2.5mm conductors, if the ring is broken or if a contact becomes high resistance, it is possible that 32A could flow down a single 2.5mm conductor and be overloaded.
Assuming there is space in the consumer unit, why don't they don't use duplex breakers (2x20) so that each end of the ring gets its own breaker? and the cable is fully protected even if the ring breaks?
Assuming there is space in the consumer unit, why don't they don't use duplex breakers (2x20) so that each end of the ring gets its own breaker? and the cable is fully protected even if the ring breaks?