PSR & Machine Guarding Compliance Guide

Pre-Start Health & Safety Reviews (PSRs) and Machine Guarding in Ontario: Ensuring Compliance & Safety

If you’re a manufacturing manager, safety officer, or industrial engineer in Ontario, you know that workplace safety isn’t optional – it’s the law. One key legal requirement is the Pre-Start Health & Safety Review (PSR), which must be conducted whenever new equipment or modifications could pose hazards before the machinery is put into use. Machine guarding is often at the center of these reviews, as inadequate safeguarding of machines is a leading cause of workplace orders and injuries. In fact, roughly 17% of Ontario Ministry of Labour safety orders have involved insufficient machine guarding. In this article, we explore how PSRs and effective machine guarding work together to keep your operations compliant and your workers safe.

Understanding Pre-Start Health & Safety Reviews (PSRs)

A Pre-Start Health & Safety Review is a mandatory safety evaluation conducted by a qualified professional before certain equipment or processes are launched. In Ontario, PSRs are required under the Occupational Health & Safety Act (OHSA) Regulation 851 for industrial establishments. Simply put, a PSR ensures that any new or modified equipment, process, or protective element (like a machine safeguard) meets all applicable safety standards before workers are exposed to it.

Ontario’s regulations outline eight scenarios that can trigger the need for a PSR. These include the installation or modification of safeguarding devices on machinery, the use or storage of flammable liquids, installation of large storage racking, processes with explosion risks, dust-collection systems, and other high-hazard changes. For example, adding a new interlocked safety guard to a press or introducing a process involving combustible dust would each require a PSR to verify adequate controls are in place. The rule of thumb is: if a change could introduce a significant hazard, a PSR is likely mandatory before startup.

By law, a PSR must be carried out or approved by a licensed professional engineer (P.Eng.) in Ontario. The engineer will inspect the equipment or process and produce a written report identifying any safety non-compliance and recommending measures for compliance. (In certain cases like chemical exposures, a qualified industrial hygienist may conduct the review, but for machine safety a P.Eng. is typically required. Skipping a required PSR isn’t just illegal – it’s dangerous. Non-compliance can lead to fines, stop-work orders, or worst of all, accidents and injuries. Proactively doing a PSR helps you catch and fix hazards before they harm your employees or your business.

Machine Guarding: Why It’s Crucial and When It Triggers a PSR

Machine guarding refers to protecting the hazardous parts of machinery to prevent worker injuries. Under Ontario law, any machine component that could hurt someone must be securely guarded – “if it can hurt a worker, it must be guarded” is the guiding principle. This is not just regulatory box-checking; it’s a vital safety practice. Every year, many serious workplace injuries are caused by contact with moving machinery. For instance, one year’s data showed nearly 2,000 workers in Canada were caught or crushed by industrial machines, with hundreds suffering severe injuries like amputations. Improper or missing guards can lead to amputations, electrocutions, or even fatalities. Clearly, effective machine guarding is a life-and-death matter on the factory floor.

It’s no surprise, then, that machine safeguarding is specifically addressed in the PSR requirements. In fact, one of the primary PSR trigger scenarios (Item 2 in Regulation 851’s Section 7 table) is when safeguarding devices are used as protective elements on equipment. This means if you install safety measures like light curtains, area scanners, two-hand control stations, safety interlocks on gates, or other advanced protective devices that stop a machine when a guard is opened, you are required to do a PSR before using that equipment. In short, if you have a guard that is interlocked and will stop the machine when opened, you need a PSR. (Notably, an emergency stop button alone does not count as a safeguarding device that triggers a PSR – an E-stop is important, but it’s not a substitute for proper guards. On the other hand, adding a simple fixed barrier guard that isn’t connected to the machine controls might not invoke the PSR rule. Because the regulations can be technical, it’s wise to consult with a PSR expert if you’re unsure whether a particular change requires a review.

When a PSR is conducted for machinery safeguarding, the reviewing engineer will check that your guarding measures comply with relevant standards. A key reference is the Canadian standard CSA Z432: Safeguarding of Machinery, which provides guidelines on the design and use of machine guards and safety devices. In Ontario, safety inspectors and engineers expect machine guards to meet CSA Z432 requirements (for example, proper guard spacing, durable construction, interlock reliability) as well as any machine-specific standards. Proper lockout/tagout provisions (CSA Z460) and emergency stop functions are also evaluated as part of a complete safeguarding system. By adhering to these standards, you not only comply with the law but also ensure that your guarding truly protects workers as intended.

Benefits of PSRs and Effective Machine Guarding

Implementing proper machine guarding and undergoing PSRs isn’t just about obeying the law – it brings tangible benefits to your business. Some key advantages include:

• Regulatory Compliance & Avoided Penalties: You meet Ontario safety requirements and avoid fines or liability from non-compliance. A PSR gives you documentation that your equipment is certified safe.
• Accident Prevention: Robust guards and safety reviews greatly reduce the chance of serious incidents. This means fewer injuries (or worse) on site – preventing life-changing accidents like amputations or fatalities.
• Worker Confidence & Morale: Employees feel safer and more valued in a workplace that takes safety seriously. Demonstrating a commitment to guard their well-being boosts morale and can even improve productivity.
• Operational Continuity: Safe equipment is less likely to fail or cause downtime. By anticipating human error and hazards (through guarding and PSRs), you avoid costly disruptions and keep production on track.
• Reputation & Stakeholder Trust: Maintaining a strong safety record builds trust with clients, investors, and regulators. Showing that you proactively manage risks (via professional safety audits and upgrades) enhances your reputation and business relationships.

In short, investing in safety upfront – through thorough PSRs and high-quality machine guarding – pays dividends by preventing accidents, protecting your workforce, and ensuring smooth operations. It’s an investment in your people and your company’s long-term success.

Staying Compliant: Getting Professional Help with PSRs and Guarding

Managing PSR obligations and machine safeguarding can be complex, especially when you have multiple pieces of equipment or ongoing changes. It’s wise to establish an internal procedure to evaluate every new installation or modification for PSR requirements. Tools like the WSPS PSR Checklists for new and modified equipment can help you determine when a review is needed. However, the safest approach is to consult with experts.

This is where PSR services from a specialized engineering firm can make all the difference. An experienced safety engineering team like HITE Engineering will ensure no detail is overlooked. Our licensed engineers have conducted hundreds of PSRs across all the trigger scenarios, including countless machine guarding assessments. We don’t just issue a report listing problems – we provide practical solutions. For example, when a PSR finds that a machine’s guarding is non-compliant, we will recommend specific upgrades or design custom guarding that meets machine guarding standards without hindering your production.

HITE Engineering has over 25 years of experience helping Ontario businesses stay safe and compliant. We can handle the entire PSR process for you – from the initial hazard assessment and onsite review, through to the final engineering report and sign-off. If needed, we can also assist with implementing the required changes, whether it’s installing proper guarding or upgrading other safety systems. Don’t let compliance requirements become a burden or risk. Our motto is “Ensuring safety through engineering,” and we stand by it. Contact us today to discuss how we can support your Pre-Start Health & Safety Review and machine safeguarding needs, and help you create a safer workplace for everyone.