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I can't see a problem with it especially if it's you operating it since you know where all the RCD's are and would check to see which one operated.
Yeah, I'm less concerned about working out which one went than any of them not going at all. Especially now our main CU is properly labelled and not "car port" and "east car park" (we have neither of those things).
I do remember you saying this but then it was a spark who was actually in my house so I'd rather blame someone who has been here rather than someone on the internet (not that I don't trust you, you've been a very helpful source of information). Also, all three times I've hired floor sanders (from two different places), they insist on also providing an RCD plug adapter without specifying it's only needed if your own house circuit is not already protected. That logic to me says "better safe than sorry", or "you'd rather have it an not need it, that need it and not have it", if that makes sense.