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Current “leaking” from either live or neutral, to earth. This is what triggers your RCD to trip. The rcd measures current going out and what’s coming back in, so if any current is making its way out of the system (to earth or otherwise), it trips, as it can tell that current is being lost.
For example, if you have some moisture in the components that creates a link between a live component and a metal component (which will be earthed) it will trip the RCD.
Nef
I spent quite along time with a hair dryer earlier.
What’s earth leakage?