Occupational Health, Safety and Environmental Practices
What the exam tests
This domain checks whether you can work legally and safely on a sprinkler site: provincial or territorial OHS duties, WHMIS 2015, fall protection, hot work, confined spaces, pressure-test hazards and environmental controls. Questions often describe a site task and ask which control must be in place before work starts.
Core rules
- Duty and rights. Provincial OHS legislation sets employer and worker duties. Workers can refuse unsafe work, and must be trained before using equipment or hazardous products.
- WHMIS 2015/GHS. Pipe dope, primer, glycol, foam concentrate and solvents need labels, safety data sheets and training. Never decant into unlabelled containers.
- PPE and exposure. Eye, hand, hearing and respiratory protection; fit testing for respirators; silica and metal-fume controls when cutting or brazing.
- Fall protection. Use guardrails first. Otherwise use CSA Z259-compliant systems, trained users, a rescue plan and manufacturer-rated anchors, commonly 22 kN.
- Hot work. Follow NFPA 51B: permit, combustibles cleared, fire watch during work and for at least 60 minutes after.
- Confined space. Permit, atmospheric testing before and during entry, attendant, communication and a rescue plan.
- Pressure testing. Barricade the area, use calibrated gauges, never stand in line with test plugs or caps, and do not use compressed air on water pipe unless the standard permits it.
- Environment. Contain flush and test water, neutralize or dechlorinate where required, and keep a spill kit for oils, glycol and foam.
Worked example
A fitter plans to use a 6 ft shock-absorbing lanyard from an anchor 15 ft above the floor. Deceleration distance is 3.5 ft, harness stretch 1 ft and safety factor 2 ft. Required clearance = 6 + 3.5 + 1 + 2 = 12.5 ft. With the anchor at 15 ft there is enough clearance. If the anchor were only 10 ft above the floor, the lanyard system would be unacceptable; use a self-retracting lifeline or relocate the anchor. Include swing-fall and edge hazards in the plan.
Traps that cost marks
- Treating WHMIS as paperwork rather than training and labelling.
- Forgetting the post-work fire watch.
- Entering a confined space after only one atmospheric reading.
- Quoting the 200 psi hydrostatic test as a reason to skip barricades.