Under BS7671:2018+A1:2020 (as is valid until 27 sept) there are situations when both need to be completed, its not simple as the form makes out of being 1x for above 30mA, and 5x for 30mA and below.Thanks. That's what I thought - and why (by implication) I was asking why both boxes had been completed.
RCDs for additional protection (which will be rated at 30mA and below) need to be tested at 5x
RCDs for fault protection need to be tested at 1x.
In some instances, you might be using the same device to serve both purposes, such as a dual split board on TT (without separate 100S incommer) or a C type rcbo on a TN system where you cant meet the Zs for the overcurrent device (ergh)
(Of course, for RCDs in excess of 30ma, they cant provide additional protection and testing at 5x has never been required)
But now they have changed it again, and we just test them all at 1x under BS7671:2018+A2:2022, I do wish they'd stop changing things!