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Well, as stated, I am not a mains electrical person and I can assure anyone concerned with the username that I have absolutely no intention of answering any technical questions in this forum ! Coming from the radio transmission engineering business I do understand most of the interesting...

Thanks for all the excellent info gents. I wasn't sure how the leakage current was detected and wondered if the two devices might somehow share it. Most helpful and much appreciated. Sparky54

Pardon my lack of electrical knowledge and ignore the Sparky user name :? but I was wondering if an RCD plugged into a ring main powered via an RCBO would not be as effective due to them sharing the trip current, or will the most sensitive of the pair still trip first at ~30mA ?