This new youtube video https://www.youtube.com/watch?v=CqQfN3-nf4s from efixx features reps from Lewden, Megger and ECA having a half hour discussion on how type A etc RCDs should be tested, in particular relation to devices being returned to the manufacturer in error as being faulty.
The rough consensus seemed to be: to satisfy BS 7671, test on the AC setting of your tester, checking for either ≤40ms @ ≥ x 5 for additional protection, ≤300ms @ x 1 for fault protection.
You can in addition test on the A setting of your tester, but now you're not in BS 7671 territory and the times you get may not satisfy 40ms - but the device may still be within the requirements for BS 61009 etc.
Discuss….
