Exams / HS&E RAAC / Electrical isolation / Question 5

HS&E RAAC practice question: Electrical isolation (5 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.

Last verified October 2026 against HSE guidance and the law ·How we write our questions

Other trades will be drilling and cutting near the existing electrics during an air conditioning refit.

What does HSE say?

Choose one answer.

A. Tell the other trades to be careful, and nothing more
B. Switch off the whole street
C. Isolate the relevant parts
D. Leave it live, so the lights stay on

Show the answer and explanation

Answer: C

A. Wrong: Wrong. Isolate the relevant parts.
B. Wrong: Wrong. Isolate the relevant parts.
C. Right: Right. HSE says where other trades' work could disturb or damage the existing system, isolate the relevant parts.
D. Wrong: Wrong. Isolate the relevant parts.

Explanation

Isolate parts of the electrical system that other trades' work could damage.

Study

HSE: Electricity, systems in buildings

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