Safety, Health and Environmental Practices
This domain tests whether you can walk into a working cabinet shop, name the hazard, choose the right control, and back it up with the paperwork - WHMIS 2015 labels and safety data sheets, provincial exposure limits, and fire-code rules for combustible dust. Questions are usually scenarios: a machine, a chemical, a noise reading, and four possible actions.
The control hierarchy
Eliminate the hazard, substitute a safer material, engineer it out (local exhaust ventilation, guards, enclosures), then administrative controls (rotation, training, procedures), and only then personal protective equipment. Examiners love the case where the candidate jumps straight to a respirator.
Dust, noise and chemicals
- Wood dust is a designated carcinogen; typical provincial limits follow ACGIH - about 1 mg/m³ for hardwood and 5 mg/m³ for softwood, inhalable fraction.
- Noise: 85 dBA for an 8-hour equivalent, 3 dB exchange rate; hearing protection and audiometric testing.
- WHMIS 2015: 16-section SDS, 9 GHS pictograms; the SDS is the first stop for a spill or a splash.
- Solvents and lacquers: flash point, bonding and grounding of containers, spray booth ventilation.
- Isocyanates in some adhesives and 2K coatings are sensitizers - overexposure can end a career.
Machines and energy
- Guarding follows CSA Z432; before changing a blade, clearing a jam or reaching into a dust hood, lock out and verify zero energy.
- No gloves, rings or loose sleeves at rotating tools; gloves are for handling stock and chemicals.
- Use GFCI protection on site, inspect cords, and never daisy-chain power bars.
Fire and environment
- Combustible dust: ductwork bonded to ground, no accumulation on beams, no open flames near collection systems.
- Solvent-soaked rags go into a self-closing metal can - spontaneous combustion is real.
- Segregate waste, use the spill kit, and record disposal per provincial environmental rules.
Worked example
Dust sampling at a table saw reads 3 mg/m³ hardwood dust against a 1 mg/m³ limit. The correct order: first engineering - enclose the blade as far as the guard allows, fit a hood at the source, and check duct velocity and hood capture, since a clogged branch is a common cause. Second, administrative - check the LEV runs while cutting and is inspected. Third, interim PPE - a fit-tested half-mask with P100 filters. Finally, re-sample to prove the fix worked. Choosing the respirator first would score zero on the control hierarchy.
Traps that cost marks
- Treating a shop vacuum as local exhaust ventilation - it is not a substitute for a ducted hood.
- Forgetting that a machine switched off is still energized until locked out.
- Confusing WHMIS pictograms, or not knowing which SDS section covers first aid (Section 4) and firefighting (Section 5).
- Assuming hearing protection permits unlimited exposure instead of reducing the level at the ear.