How do I safely isolate a circuit?

Identify the circuit, switch off, lock and tag it, then prove dead with a tester you've just checked on a known live source (test–before–touch). Re-check the tester after. Treat everything as live until proven dead.

Prove tester → test → re-prove

Regulation: AS/NZS 4836 (safe working on LV); WA Electricity (Licensing) Regulations 1991.

Study aid in plain English, not the text of the standard. Always check the current AS/NZS 3000:2018 + WA rules and your local rules. Electrical work must be done by a licensed or registered electrician.

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