- Reaction score
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The way I interpreted that is that you test on the load side and that can be anywhere in the circuit covered by the rcd, be it at the CU or at the closest socket outlet or the furthest light.
Your just testing the device only and not the circuit is what the article is saying.
I always test at the CU and until the regulations say different then I always will
Its the words 'between the line conductor of the protected circuit and the associated cpc' that confuses me. Personally, I would test the easiest quickest way, either at the CU or from somewhere on the circuit, which for me is usually the latter.