Workplace Safety: Hazards, PPE and Confined Spaces
What this domain tests
Safety questions test hazard recognition and control in plumbing work: hand and power tools, electrical risks, trenching, confined spaces, hot work and gas cylinders. Answers must show a hierarchy of control, not just “be careful”.
Core rules and concepts
- PPE includes safety glasses, gloves, safety footwear, helmet, hearing protection and respiratory protection where dust or solvent vapour is present.
- Electrical safety: use RCD protection, check leads, keep power tools away from wet areas, and lock off before work on circuits.
- Trench safety: shore or bench deep trenches, keep spoil back from the edge, and provide a safe access route.
- Confined space entry needs a permit, gas testing, ventilation, a harness and rescue line, and a standby attendant.
- Hot work needs a fire watch, extinguisher, shielding and clearance of combustibles.
- Gas cylinders must be upright, secured, kept away from heat and fitted with flashback arrestors.
Worked example
A plumber must enter a sump to repair a pump. The safe sequence is: isolate and lock off the pump, test the atmosphere for oxygen and toxic or flammable gas, ventilate, wear a harness with a rescue line, station an attendant at the entry, and work under a permit. The reasoning: oxygen-deficient or toxic atmospheres can overcome a worker quickly, and a lone entrant cannot be rescued without a standby.
Traps that cost marks
- Entering a confined space alone or without gas testing.
- Using a ladder as a work platform in a deep trench.
- Storing gas cylinders lying down or near heat.
- Defeating an RCD because it keeps tripping.
- Starting hot work without a fire watch.