Your elevator company replaced a safety relay last month. The invoice line reads: "Safety relay replacement, part plus labor: $800." The work order says the elevator is back in service. Everything looks normal.
What the invoice does not tell you: was that relay NRTL listed?
If not, your building is now running uncertified safety equipment. The part may function. It may even function for years. But it was never tested by a recognized safety laboratory. Nobody verified it meets the standards your elevator code requires. And when your next inspection comes, or when something goes wrong, you will discover the gap the hard way.
A 2023 industry audit found that 37% of aftermarket elevator parts lack NRTL certification. That means more than one in three replacement parts installed by some service companies have never been independently tested for safety compliance. This is not a problem you can see on an invoice. But it is a problem you own the moment that part is installed in your building.
Here is what NRTL certification means, why the gap exists, and how to protect your building from uncertified components.
What Is NRTL Listing?
NRTL stands for Nationally Recognized Testing Laboratory. It is an OSHA recognition program that certifies independent testing organizations to evaluate products for safety compliance.
When a part is "NRTL listed," it means a recognized laboratory tested the component and certified it meets applicable safety standards. The laboratory verified the product's design, examined manufacturing processes, and conducted testing protocols specific to the part's function.
Common NRTLs you will see in elevator applications include:
- UL (Underwriters Laboratories): The most recognized certification mark in North America
- ETL (Intertek): Equivalent to UL in regulatory acceptance
- CSA (Canadian Standards Association): Common on parts manufactured in or for Canada
- TUV (Technischer Uberwachungsverein): German certification, recognized in many US jurisdictions
These marks appear directly on certified components, usually as a stamped logo or printed label. When you see a UL or ETL mark on a relay, contactor, or circuit board, you know someone tested that specific product design before it reached the market.
"Not listed" means the opposite. The part has no third-party safety certification. Nobody outside the manufacturer verified it meets any standard. This does not automatically mean the part is dangerous. Some unlisted parts function correctly for years. But you have no independent verification, and in many jurisdictions, installing unlisted components violates elevator code.
The distinction matters because elevator codes in most states reference NRTL compliance. When your code says electrical components must be "listed," it means NRTL listed. A part without that listing is a code violation whether it works or not.
The 37% Problem
A 2023 industry audit examining aftermarket elevator parts suppliers found 37% of sampled components lacked NRTL listing. The finding reveals a structural problem in how aftermarket parts reach elevator service companies and ultimately your building.
Why does over a third of the aftermarket lack certification? Three factors drive the gap.
Certification cost. Getting a part NRTL listed costs between $5,000 and $50,000 depending on complexity, plus ongoing fees for factory audits and sample testing. For a manufacturer producing low-volume parts for older elevator systems, certification may cost more than the annual revenue that part generates. The economic calculation is simple: skip certification, sell cheaper parts.
Overseas manufacturing without US testing. Many aftermarket parts originate from manufacturers in China, India, or other regions where US safety certification is not required for domestic sale. These parts reach US distributors without ever passing through an NRTL. Some distributors sell them as-is. Others relabel them with house brands that obscure the lack of certification.
The "equivalent" problem. Service companies frequently substitute aftermarket parts claiming equivalence to original equipment. A relay that looks identical to the OEM component and fits the same mounting points gets installed as equivalent. But "equivalent" in mechanical fit does not mean equivalent in safety testing. The OEM part was NRTL listed. The substitute may not be.
The resulting quality distribution is bimodal. Some aftermarket suppliers maintain rigorous certification programs and offer genuinely excellent parts at significant discounts to OEM pricing. Others sell untested components from unknown factories, competing purely on price. From an invoice, you cannot tell which is which.
This matters because building owners rarely see the parts. Your service company installs components. You see line items on invoices. Unless you specifically ask for certification documentation, you have no visibility into what is running your elevator.
Why This Matters for Building Owners
The parts certification gap creates four categories of risk for building owners, starting with the most immediate.
Inspection failure. Many jurisdictions require NRTL-listed components in elevator systems. An inspector who opens a controller cabinet and finds unmarked relays or contactors can cite the installation as a code violation. Depending on the jurisdiction and inspector, this can mean anything from a notation on your certificate to a failed inspection requiring shutdown until corrected. The elevator annual inspection checklist covers what inspectors evaluate, but parts certification increasingly appears on that list.
Liability exposure. When an elevator incident occurs, investigators examine everything: maintenance records, parts specifications, service history. If an incident involves a component that was never certified, liability shifts sharply toward whoever authorized that installation. If your service contract allowed "equivalent parts" without specifying certification requirements, you may have authorized it by default. Understanding elevator liability for property owners becomes critical when uncertified components are involved.
Insurance implications. Commercial property insurance typically requires code-compliant elevator maintenance. Installing uncertified parts may technically violate compliance requirements, giving insurers grounds to dispute claims. If an injury occurs and the investigation reveals uncertified safety components, your carrier will notice.
Your responsibility versus the service company's. This is where building owners often get burned. Your service contract may include indemnification clauses suggesting the service company bears responsibility for parts selection. But building owners are ultimately responsible for code compliance in their properties. If your contract allows "equivalent" or "aftermarket" parts without certification requirements, you implicitly authorized whatever parts your service company chose. The distinction between what you authorized and what actually got installed matters in courtrooms.
The worst scenario is discovering the gap after a failed inspection. By then, uncertified parts are already installed, your elevator may be tagged out of service, and the cost of correction falls on you regardless of what your contract says about parts responsibility.
How to Verify Parts Certification
You do not need an engineering degree to verify parts certification. You need to know what to look for and what questions to ask.
Look for NRTL marking on installed parts. Certified components carry visible marks: the UL logo, ETL symbol, CSA mark, or TUV certification. These appear on the part itself, not just packaging. If your service company allows access to the machine room, you can visually inspect major components like contactors, relays, and control boards for certification marks.
Request certificates of conformance. Any reputable parts supplier can provide certification documentation for their products. Ask your service company to provide certificates for major parts replacements. If they cannot or will not produce documentation, that tells you something.
Check the UL database. UL maintains a public product database at productiq.ulprospector.com where you can verify certification status. If a supplier claims UL listing for a specific part, you can confirm it.
Examine parts invoices for manufacturer information. Generic descriptions like "safety relay" or "door operator contactors" without manufacturer or part numbers make verification impossible. Request invoices that include manufacturer names and model numbers. Parts from recognized manufacturers (GAL, MAFELEC, Adams, etc.) are almost always certifiable because those companies maintain certification programs.
Watch for red flags. Certain patterns suggest certification problems:
- Parts priced dramatically below market rates
- No manufacturer identification on components
- Service company resistance to documentation requests
- "House brand" or "generic" descriptions
- Unmarked or relabeled packaging
The cost of verification is minimal compared to the cost of discovering uncertified parts during an inspection or after an incident.
Contract Language That Protects You
Your maintenance contract either protects you from uncertified parts or enables their installation. The difference is contract language.
Review your current contract for parts sourcing provisions. If you find language like "equivalent parts permitted" or "contractor may substitute parts at its discretion" without certification requirements, you have exposure. Hidden fees in elevator maintenance contracts are one problem; hidden parts quality compromises are another.
Here is contract language that protects you:
NRTL requirement: "All replacement parts shall be NRTL listed by a laboratory recognized by OSHA. Contractor shall provide certification documentation upon request."
Prior approval clause: "Any substitution of non-OEM parts requires prior written approval from Owner, including certification documentation demonstrating compliance with applicable codes."
Certificate of conformance: "Contractor shall maintain certificates of conformance for all parts installed and shall provide copies within five business days of Owner request."
Audit rights: "Owner reserves the right to audit parts invoices and certification documentation annually at no additional charge."
If your service company refuses to accept parts certification language, that resistance tells you something about their sourcing practices. Most reputable contractors have no objection to certification requirements because they already use certified parts.
When negotiating elevator contracts, parts certification should be as fundamental as response time guarantees. Use the Contract Scanner to identify how your current agreement handles parts sourcing and whether you have gaps to address.
When Aftermarket Parts Make Sense
This article is not anti-aftermarket. Aftermarket parts can offer excellent value when sourced responsibly.
Many aftermarket suppliers maintain rigorous NRTL certification programs. They offer parts that are functionally identical to OEM components, fully certified, and priced 40-60% below manufacturer list prices. For buildings with aging equipment where OEM parts are increasingly expensive or unavailable, quality aftermarket is often the best solution.
The goal is not to avoid aftermarket. The goal is to ensure whatever parts enter your building are certified, regardless of source.
How to identify reputable aftermarket:
Certification verification. Reputable suppliers provide certification documentation proactively, not reluctantly. Ask for proof.
Manufacturer transparency. Quality aftermarket suppliers identify their manufacturing sources. They do not hide origins behind house brands or generic labeling.
Warranty backing. Legitimate suppliers stand behind their parts with meaningful warranties. If a supplier will not warranty a component, consider why.
Industry reputation. Elevator industry professionals know which aftermarket suppliers are reliable. If your independent elevator company recommends a specific supplier, ask about their certification practices.
The decision between OEM and aftermarket should be about value, not just price. A $150 certified aftermarket relay that performs identically to a $350 OEM relay is good value. A $75 uncertified relay from an unknown manufacturer is not savings; it is hidden risk transferred from your service company to your building.
What to Do If You Suspect Uncertified Parts
If you have concerns about parts already installed in your building, you have options. Do not assume you are stuck with whatever is currently running.
Request a parts inventory. Ask your service company to provide a list of major parts replacements over the past three to five years, including manufacturer names and part numbers. This creates baseline documentation you can verify.
Audit recent invoices. Review invoices for parts replacements. Look for manufacturer identification. Generic descriptions without manufacturers warrant follow-up questions.
Hire an independent inspection. Consider engaging an independent elevator consultant to examine your system. Unlike your service company, an independent consultant has no stake in what parts are installed. They can provide objective assessment of component quality and certification status. This is particularly valuable if you are considering switching elevator companies.
Document everything. If you discover uncertified components, document the finding with photographs, invoice records, and any communications with your service company. This documentation matters if questions arise later.
Address contract language going forward. Even if you cannot easily replace every installed component, you can ensure future installations meet certification requirements. Update your contract before the next renewal.
The cost of addressing potential uncertified parts is lower than the cost of discovering them during an inspection failure or liability investigation.
Protect Your Building Now
The 37% certification gap in aftermarket elevator parts represents hidden risk that most building owners never see. Your invoices do not flag it. Your service company may not mention it. But you own the compliance obligation.
Three steps to protect your building:
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Review your current contract for parts sourcing language. If it permits "equivalent" parts without certification requirements, you have exposure.
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Request certification documentation for any major parts replacements in the past three years. The response tells you whether your service company prioritizes compliance.
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Add certification requirements to your next contract negotiation. This is table stakes for responsible elevator maintenance.
Your elevator maintenance contract should protect you, not expose you. Use the Contract Scanner to analyze your current agreement and identify parts sourcing gaps before your next inspection reveals them.