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HS&E LAEE practice question: Isolation and maintenance (1 of 6)

E. Specialist: Lifts and escalators A free question from our original HS&E LAEE practice exam. Try it, then open the answer to see why each option is right or wrong.

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You are about to work on a lift motor in the machine room.

What must happen to the power supply first?

Choose one answer.

  1. A. It is left on so you can test as you go
  2. B. It is switched off at the lift car only
  3. C. A note is put on the door
  4. D. It is isolated and locked off
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Work on equipment that has been made safe.
  • B. Wrong: Wrong. Isolate the supply and lock it off.
  • C. Wrong: Wrong. A note won't stop someone switching it on.
  • D. Right: Right. HSE says isolate power supplies and lock off if there is a chance the power could be switched back on.

Explanation

Before maintenance, stop the equipment, isolate the power and lock it off.

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