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HS&E RAAC practice question: Electrical isolation (3 of 5)

E. Specialist: HVACR – refrigeration and air conditioning A free question from our original HS&E RAAC practice exam. Try it, then open the answer to see why each option is right or wrong.

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You have isolated an air conditioning unit to work on it.

What should the method of isolation do?

Choose one answer.

  1. A. Stop it being switched back on
  2. B. Allow anyone to turn it on
  3. C. Leave the fuse in a drawer nearby
  4. D. Turn off only the display screen
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE says the method of isolation should prevent inadvertent or deliberate re-energisation.
  • B. Wrong: Wrong. It should prevent re-energising.
  • C. Wrong: Wrong. It should prevent re-energising.
  • D. Wrong: Wrong. Isolate the supply.

Explanation

Isolation must stop anyone switching the supply back on, by accident or on purpose.

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