Start with Certification. Finish on Time.  Common Questions About NRTL Certifications 

Welcome to The Safety Desk, Product Safety Consulting’s FAQ series dedicated to answering the most common and critical questions in product safety and regulatory compliance.

If you’re developing products for the U.S. or Canadian markets, save a seat at the launch party for NRTL certification. Whether your product can be installed in US workplaces, sold in Canada, stocked by retailers, and launched on time often hinges on this process. 

NRTL has a reputation for being slow and expensive. Roughly nine out of ten products fail their first certification attempt. 

Most of those failures have little to do with poor engineering and a lot to do with timing. Certification requirements often enter the conversation late, after key design decisions are already locked in. 

That’s usually when the problems surface. Materials that don’t meet flammability requirements. Components that look fine on paper but fall short under testing. Safety features that seem reasonable until they meet the exact wording of the standard. Fixing these issues late in the game means revisiting tooling, schedules, and sometimes promises already made to customers. None of that is fast, inexpensive, or particularly fun. 

Manufacturers that sail through certification tend to treat compliance as a vital part of product development. They confirm the applicable standard early, choose compliant components from the start, and design with testing in mind. The payoff is fewer surprises, fewer redesigns, and a testing phase that feels more like a process and less like a plot twist. 

This FAQ covers the questions manufacturers ask most often when approaching NRTL certification, whether it’s your first time through or you’ve already learned a few lessons the hard way. 

1. What is an NRTL certification and why do I need it? 

An NRTL (Nationally Recognized Testing Laboratory) certification confirms that your product meets North American safety standards. 

In the US, OSHA requires NRTL certification for products used in workplace environments. In Canada, certification is required to legally sell products in the market. Without it, customers may walk away, retailers may pass, and regulators may take a second (or third, or fourth…) look at your processes.  

2. How long does the NRTL certification process typically take? 

That depends on how early you assimilated certification into your design.  

Products conceived with certification requirements in mind often complete the process in six to ten weeks. On the contrary, the rest tend to spend extra time in redesign and retesting, which can stretch timelines by months. This is where early compliance input pays for itself, often more than once. 

3. What’s the difference between US and Canadian certification requirements? 

Both markets require third-party certification, but they’re governed by different systems. 

In the US, OSHA requires certification from an OSHA-recognized NRTL for workplace products. In Canada, certification is mandatory for market access. Many testing laboratories can support both, but not all are accredited for every market. Confirming this early avoids awkward mid-project revelations. 

4. Why do most products fail their first certification attempt? 

Most failures can be traced back to design choices made without the standard fully in focus. 

Common issues include material selections that don’t meet requirements, components without proper ratings, gaps in electrical safety, or documentation that doesn’t quite tell the full story. These issues are usually fixable, just much easier to fix before testing begins. 

5. How much does NRTL certification cost? 

Enough that you’ll want it to run smoothly. Costs vary widely based on product type, complexity, and readiness. 

Certification expenses typically fall between $10,000 and $100,000. Testing fees are only part of the total. Redesigns, retesting, engineering time, and schedule delays add up quickly. Teams that address compliance early tend to sleep more soundly, finding the total cost comes in lower. 

6. Can I use multiple certification marks on my product? 

Sometimes. 

Different retailers or markets may prefer specific certification marks. Using multiple marks can open doors, but each one comes with its own certification process. More marks mean more opportunity, and more wrangling, so it’s best to assess resources and decide what’s worth it and necessary in the long run.  

7. What documentation do I need for NRTL certification? 

More than you think and sooner than you’d expect. 

You’ll need a complete technical package, including product specifications, circuit diagrams, component data sheets, bills of materials, test reports, and user manuals. Missing or inconsistent documentation is a serious no-no and common source of delays. Clear, organized records make the certification process noticeably smoother for everyone involved. 

8. Do I need to recertify my product if I make changes? 

It depends on the change. Was it a subtle tweak or did you take it back to the drawing board? 

Minor updates may be acceptable without retesting, but changes to materials, electrical components, or safety-related features often require review or additional testing. Checking in before making changes helps prevent unpleasant surprises later. 

9. What happens if I sell products without NRTL certification? 

We certainly wouldn’t recommend it. The risks are tremendous. 

Regulators can issue steep fines and violations. Retailers may flat out refuse to carry the product. Liability exposure increases drastically if something goes wrong. Certification is table stakes for participating in the North American market. 

10. When should I start thinking about NRTL certification in product development? 

Day one, if possible. 

Considering certification during concept and design helps reduce redesigns, shorten testing timelines, and keep launches on track. It also makes the entire process feel far more predictable, which is a welcome change for most product teams. 

Your PSC Partner Who’s Been There Done That 

With the right guidance, NRTL becomes a predictable, turn-key part of product development. 

That’s where Product Safety Consulting comes in. We work with teams early, help identify the right standards, flag issues before testing begins, and guide products through certification with fewer revisions, fewer delays, and far fewer “how did this happen?” moments. We’ve seen what goes wrong when compliance is treated as an afterthought, and we know how to prevent it. 

If your goal is to get certified efficiently, avoid unnecessary redesigns, and keep your product launch moving forward, partnering with Product Safety Consulting means you don’t have to navigate NRTL certification alone, or learn everything the hard way. 

Disclaimer 
This content reflects general industry knowledge about safety certification requirements and is provided for educational purposes only. Product Safety Consulting, Inc. does not provide legal or regulatory guarantees. Certification requirements vary by product, application, and jurisdiction. Always consult qualified certification professionals and accredited testing laboratories for guidance specific to your product. onsult with qualified certification professionals and testing laboratories for guidance on your particular situation.