Occupational Health and Safety and Workplace Legislation
The Internal Responsibility System
Ontario's Occupational Health and Safety Act (OHSA) rests on the Internal Responsibility System: everyone in the workplace-employer, supervisor, worker-shares responsibility for safety. Employers must provide a safe workplace, information, instruction, training, and supervision. Supervisors must ensure workers comply with the Act and use protective equipment. Workers must work safely, report hazards, and use required equipment; they also have rights to know about hazards, to participate, and to refuse unsafe work.
The Right to Refuse
A worker may refuse work they have reasonable cause to believe is unsafe. The refusal triggers a defined process: report to the supervisor, investigation with a health and safety representative or joint committee member present, and, if unresolved, involvement of a Ministry of Labour inspector. Certain workers (for example, police and firefighters) have modified procedures. Know that the right is not a licence to refuse ordinary job conditions.
Other Core Elements
Joint Health and Safety Committees (JHSC) are required above certain thresholds; certified worker members exist. Workplace Hazardous Materials Information System (WHMIS) requires labels, safety data sheets, and training. Report serious injuries and fatalities to the Ministry, and preserve the scene. Also recognize the Workplace Safety and Insurance Act for injury benefits and return-to-work duties.
Traps
Questions blur "employer" and "supervisor" duties, or suggest a worker can refuse without following the process. Another trap: assuming a supervisor may discipline a worker for a good-faith refusal-reprisal is prohibited.
Rule of Thumb
Identify the role, then the duty. Worked example: a technologist notices a guard missing on a press. As a worker, they report it immediately and do not operate the machine; as a supervisor, they would lock out the equipment, document the hazard, and arrange repair before allowing use.