Safe Isolation

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Original public revision material · A4:2026. For revision only; do not use samples to guide work on site.

1. Community draft — not yet reviewedWhat this means

   This question has not yet been reviewed by a qualified electrician. It is a community draft: check anything you plan to act on against BS 7671 and your own supervisor before you rely on it. Completing it does not make you competent, certified or registered.

   Q1. During safe isolation, when should you test your voltage indicator against a proving unit?

   AOnly before testing the circuitBOnly after testing the circuitCBoth before and after testing the circuitDOnly when the indicator is brand new

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2. Community draft — not yet reviewedWhat this means

   This question has not yet been reviewed by a qualified electrician. It is a community draft: check anything you plan to act on against BS 7671 and your own supervisor before you rely on it. Completing it does not make you competent, certified or registered.

   Q2. You have isolated a circuit and locked off the isolator. Who should hold the key?

   AThe site supervisorBYou, the person working on the circuitCThe customerDWhoever walks past next

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3. Community draft — not yet reviewedWhat this means

   This question has not yet been reviewed by a qualified electrician. It is a community draft: check anything you plan to act on against BS 7671 and your own supervisor before you rely on it. Completing it does not make you competent, certified or registered.

   Q3. What does HSE guidance note GS38 give advice on?

   ALadder and access safetyBTest probes, leads and voltage indicatorsCManual handling techniqueDAsbestos awareness

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4. Community draft — not yet reviewedWhat this means

   This question has not yet been reviewed by a qualified electrician. It is a community draft: check anything you plan to act on against BS 7671 and your own supervisor before you rely on it. Completing it does not make you competent, certified or registered.

   Q4. Before touching a circuit you believe is dead, you should prove it dead…

   ABetween line and neutral onlyBAcross all combinations of line, neutral and earthCAt the consumer unit onlyDBy operating a light switch

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5. Community draft — not yet reviewedWhat this means

   This question has not yet been reviewed by a qualified electrician. It is a community draft: check anything you plan to act on against BS 7671 and your own supervisor before you rely on it. Completing it does not make you competent, certified or registered.

   Q5. Why is a general-purpose multimeter a poor tool for proving a circuit dead?

   AIt is too expensive to risk on siteBA wrong range or dial setting can show a misleading readingCIt only works on three-phase suppliesDIt cannot measure voltage at all

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