Doing the cutting around garden area at my caravan, saw something protruding.
Tool box open got me big footprint screwdriver out and prized this out of the ground.
Old redundant earth electrode. Must of worked its way up to the surface. lol
It's certainly very confusing, reading through it, my take is this distribution circuit needs at least 300 Ma RCD protection, due to the location. Also it will give selectivity and discrimination for RCD protection used at the other end of the circuit/ circuits...
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