Machine Guarding PSR Requirements in Ontario (Regulation 851 Section 7 & CSA Z432
Machine Guarding PSR Requirements in Ontario (Regulation 851 Section 7 & CSA Z432)
Machine safeguarding is one of the most common triggers for a Pre-Start Health & Safety Review (PSR) under Ontario Regulation 851 – Industrial Establishments, Section 7.
If your project involves installing or modifying machinery that requires safeguarding devices, you must first determine whether a PSR is required. Start with the full trigger guide:
Regulation 851 PSR Trigger Determination Guide
Compliance Snapshot – Machine Guarding PSR
- Legislation: O. Reg. 851, Section 7
- Trigger Category: Safeguarding devices
- Primary Standard: CSA Z432 – Safeguarding of Machinery
- Engineer Requirement: Ontario-licensed Professional Engineer
- Timing: Before startup or worker exposure
What Is Considered a Safeguarding Device?
Safeguarding devices are engineered measures used to prevent access to hazardous motion or stop hazardous motion when access occurs.
- Interlocking devices on barrier guards
- Light curtains
- Safety area scanners
- Two-hand control or two-hand tripping systems
- Safety mat systems
- Single or multiple beam safety devices
These systems are typically evaluated against CSA Z432 during a PSR.
When Does Machine Guarding Trigger a PSR?
A PSR may be required when:
- New machinery is installed and requires safeguarding
- Existing safeguarding systems are modified
- Safety control systems are altered
- Robotic or automated systems are introduced
The key factor is whether the safeguarding device meets the criteria outlined in Table 1 of Section 7.
Common Machine Guarding Compliance Failures
- Incorrect safe distance calculations
- Interlocks that can be easily defeated
- Improper light curtain placement
- Unguarded access points during operation
- Undocumented modifications to safety systems
These issues frequently result in enforcement actions under the OHSA.
What a Machine Guarding PSR Includes
A safeguarding-related PSR typically involves engineering review of:
- Hazard identification
- Guarding method selection
- Safe distance and reach calculations
- Control system reliability
- Emergency stop integration
- Access and maintenance risks
Related Machine Guarding Resources
PSR Services and Compliance Support
HITE Engineering provides PSRs and corrective engineering for safeguarding systems across Ontario.
Pre-Start Health & Safety Review Services
Need a Machine Guarding PSR?
Contact HITE Engineering to review your machinery installation or safeguarding modifications.
FAQ: Machine Guarding PSR Ontario
Does installing machine guarding require a PSR in Ontario?
It may. If the safeguarding device meets the Section 7 trigger conditions, a PSR is required before startup.
Does changing guarding systems trigger a PSR?
Potentially. Modifications to safeguarding must be evaluated against Regulation 851 Section 7.
Who must perform a machine guarding PSR?
A Professional Engineer licensed in Ontario must conduct or approve the review.
Is CSA Z432 required?
CSA Z432 is commonly used as the benchmark for safeguarding design and evaluation during PSRs.
