Occupational Health, Safety and Environment on Plumbing Sites
Domain focus
This section tests how a plumber plans safe work and controls environmental impact on Sri Lankan plumbing sites: hazard identification, PPE, excavation, hot work, chemical handling, electrical safety and waste management. Expect questions set in real site scenarios rather than definitions alone.
Core rules
- Complete a job safety analysis before work; identify buried services, overhead lines, public access and emergency routes.
- Use PPE matched to the task: helmet, safety boots, hi-vis vest, gloves, eye/ear protection and respiratory protection for solvent vapours or cement dust.
- Excavations need shoring, battering or a trench box, safe access and barricades; never stack spoil at the trench edge.
- Hot work needs a permit, fire watch and extinguisher; LPG cylinders must stand upright and be leak-tested.
- Solvent cements, primers and chlorine are hazardous: read the SDS, ventilate, avoid ignition and never decant into unlabelled bottles.
- Segregate waste; prevent cement slurry and silt entering drains under the National Environmental Act; use spill kits.
Worked example
A 1.5 m trench is needed beside a road. The correct reasoning is: treat it as an excavation requiring a permit, locate water and electricity services, install trench support, provide ladders and barricades, and keep spoil 1 m back. A helmet alone does not control the main hazards-collapse and traffic.
Traps
Assuming PPE replaces engineering controls; leaving trenches open overnight; burning PVC offcuts; using a gas torch near solvent cement; failing to record a toolbox talk.