Exams / HS&E DUCT / Isolating fans and plant / Question 3
HS&E DUCT practice question: Isolating fans and plant (3 of 5) E. Specialist: HVACR – ductwork A free question from our original HS&E DUCT practice exam. Try it, then open the answer to see why each option is right or wrong.
Last verified October 2026 against HSE guidance and the law ·How we write our questions
An electrician is disconnecting a fan motor in the ductwork.
What does HSE say must be done before work starts?
Choose one answer.
A A. Work on it live, wearing glovesB B. Make it dead and prove it is dead with a testerC C. Switch off and assume it is deadD D. Touch the wires quickly to test themShow the answer and explanation Answer: B
A. Wrong: Wrong. Make it dead and prove it.B. Right: Right. HSE says electricity supplies should be made dead and proved to be dead before work starts.C. Wrong: Wrong. It must be proved dead.D. Wrong: Wrong. That could kill.Explanation Make electrical supplies dead and prove them dead before work starts.
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