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HS&E RAAC practice question: Working on rooftop plant (4 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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A guard rail has been fitted around rooftop plant.

How high must the top rail be, at least?

Choose one answer.

  1. A. 500 mm, about knee height
  2. B. 700 mm, below the waist
  3. C. Any height, if there is a toe board
  4. D. 950 mm
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. The minimum is 950 mm.
  • B. Wrong: Wrong. The minimum is 950 mm.
  • C. Wrong: Wrong. The minimum is 950 mm.
  • D. Right: Right. HSE says for construction work the top guard rail should be at least 950 mm above the working surface.

Explanation

Top guard rails: at least 950 mm, with gaps no more than 470 mm.

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