Ontario mandates strict safety controls for industrial establishments to ensure new or modified equipment does not introduce hazards to workers. One of the most critical compliance tools under Ontario Regulation 851 is the PHSR. This review is legally required in specific situations and must be completed before equipment or processes are placed into service.
Understanding when a review is required—and planning for it early—helps industrial facilities avoid delays, enforcement action, and unnecessary retrofit costs.
People Also Ask
When is a PHSR required in Ontario?
A PHSR is required when the conditions outlined in Ontario Regulation 851 are met, including new machinery installations, equipment modifications, or layout changes that introduce hazards.
Who can perform a PSR assessment?
Only a licensed professional engineer in Ontario is permitted to conduct and sign off on a PSR assessment.
Is a pre-start-up safety review required for relocated equipment?
Yes, if relocation changes workers’ exposure to or access to hazards, a pre-startup safety review may be required.
What happens if a required PHSR is not completed?
Operating equipment without a required PHSR can result in regulatory orders, shutdowns, and compliance penalties.
Why Ontario Mandates PHSRs Under O. Reg 851
Ontario Regulation 851 outlines requirements for safeguarding machinery and controlling hazards in industrial establishments. A pre-start health and safety review is triggered when certain conditions exist that could expose workers to risk. The intent of the regulation is preventive: hazards must be identified and addressed before operations begin, not after an incident occurs.
The PHSR framework ensures that engineering controls are in place before equipment is energized or processes are commissioned.
What Is a PHSR and Who Performs It?
A pre-start-up safety review is a formal engineering evaluation conducted to confirm that equipment, processes, or protective elements meet regulatory safety requirements. A licensed professional engineer in Ontario must perform the review.
The engineer evaluates the equipment’s design, layout, and safeguards and documents whether it complies with Ontario Regulation 851. If deficiencies are found, corrective actions must be completed before startup.
Legal Triggers That Require a Review
A PSR assessment is legally required when equipment or processes meet specific conditions outlined in the regulation. These triggers are technical in nature and are tied to how hazards are controlled.
Common triggers include situations where machinery relies on guarding, interlocks, or other engineered protective elements to prevent access to hazards. The review confirms that these protective measures are adequate and compliant.
Scenarios Where PHSRs Are Required
In practice, PHSRs are most often required in the following scenarios:
- New machinery installations where workers are exposed to moving parts or hazardous energy
- Layout changes that affect access points, safe distances, or operator interaction zones
- Modifications to existing equipment that alter guarding, control systems, or operating modes
Even when equipment is relocated within the same facility, a pre-start-up safety review may be required if the change introduces new exposure risks.
Role of a Licensed Professional Engineer (P.Eng.)
Only a licensed professional engineer is permitted to complete and sign off on a PHSR. The engineer’s role is not administrative—it is technical and accountability-based.
The engineer evaluates hazards, verifies compliance with regulatory requirements, and documents findings in a formal report. This report becomes part of the facility’s compliance record and may be reviewed during inspections.
Common Mistakes and How to Avoid Delays
Delays often occur when a PSR assessment is initiated too late. Common mistakes include assuming a review is unnecessary, waiting until installation is complete, or overlooking layout changes that trigger requirements.
Avoiding delays requires identifying PHSR triggers early, coordinating reviews during design or procurement, and allowing time for corrective actions as needed.
Conclusion – Make PSHSRs a Proactive Part of Project Planning
A pre-start health and safety review is a legal requirement designed to prevent injuries and ensure compliance. Treating PHSRs as part of early project planning—rather than a last-minute task—reduces risk, avoids shutdowns, and supports safer industrial operations.
SAFE Engineering Inc. provides compliant, engineering-driven pre-start health and safety review services to help Ontario industrial establishments meet regulatory requirements with confidence. For more information, contact us today!
