Safe isolation, every time
- Identify the circuit and switch off its breaker (MCB) or the main switch.
- Lock or tape the breaker off and tell the household not to touch the board.
- Prove your tester works on a known live source.
- Test the circuit is dead between all conductors (L-N, L-E, N-E).
- Prove the tester again on the known live source.
Safety: never work live, never bridge or bypass an RCD, and never use a bare finger or screwdriver as a tester. If the board is overheated, wet or burnt, stop and escalate.
The procedure that prevents shocks and fires.
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