Safe Isolation

Sample questions

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These sample questions are practice material and have not yet been reviewed by a qualified electrician. They are for revision only — working to BS 7671 on site is never decided by a quiz.

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

   • Only before testing the circuit
   • Only after testing the circuit
   • Both before and after testing the circuit
   • Only when the indicator is brand new

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

   • The site supervisor
   • You, the person working on the circuit
   • The customer
   • Whoever walks past next

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

   • Ladder and access safety
   • Test probes, leads and voltage indicators
   • Manual handling technique
   • Asbestos awareness

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

   • Between line and neutral only
   • Across all combinations of line, neutral and earth
   • At the consumer unit only
   • By operating a light switch

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

   • It is too expensive to risk on site
   • A wrong range or dial setting can show a misleading reading
   • It only works on three-phase supplies
   • It cannot measure voltage at all