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Which ring final step finds which reversalA neutral-earth reversal. Which step finds it?

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A favourite exam question, and it’s knowledge, not something you can look up in the steps.

Step 2 · L to N finds a CPC in the L or N terminal line–earth reversal neutral–earth reversal misses a plain L–N swap Step 3 · L to CPC finds a line–neutral reversal the brown isn’t in the L terminal, so the socket reads open circuit and gives you R₁ + R₂
Each step catches what the other can’t. That’s why it’s three steps, and why none of them is skipped.
✋A plug-in socket tester is not a substitute. Using one later, on a live circuit, means energising a circuit you haven’t fully verified — and a neutral–earth reversal is exactly what those testers can’t see. Check the small print on your own.

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