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.
Leave A Comment