IllustrationUL certification means a recognized lab tested a product to a published safety standard and keeps inspecting its production. We found no general US mandate for consumer electronics, so buyers usually ask. OSHA workplace rules accept NRTL listings, and a CPSC rule requires UL 4200A for products with coin cells. Most connected devices fall under UL/IEC 62368-1.
A buyer asks whether your device is UL certified, and nobody planned for it. This guide explains what a UL listing means for a battery-powered connected device, how a listed product differs from a recognized component, which safety standards usually apply, and who can require one. It quotes only pages we read and contains no Duobay price.
This is an engineering summary and not legal advice. Rules and standard details are as of November 2026. Full standards are paywalled, so we name clauses and scopes and quote no test limits.
What is UL certification for a connected device?
UL certification means a lab evaluated your product against a published safety standard, and the product may carry that lab's mark. For electronics, the standard deals with shock, fire, heat and injury. Radio emissions are a separate FCC track. The UL 62368-1 edition 4 scope also says it does not include requirements for performance or functional characteristics of equipment (UL store listing, as of November 2026).
The US legal vocabulary comes from OSHA's electrical rules. Under 29 CFR 1910.399, as of November 2026, equipment is listed if it appears in a list published by a nationally recognized laboratory that makes periodic inspection of its production, and the list states it meets nationally recognized standards or was tested and found safe for use in a specified manner. Two points follow:
- A listing is ongoing. The lab inspects production, and the listing covers the product as built. Part changes after listing need a talk with the lab.
- UL is one lab among several. OSHA's program recognizes private organizations to certify certain products, and each NRTL uses its own registered mark (OSHA NRTL program, as of November 2026).
UL listed vs UL recognized: what is the difference?
The two words look alike on a datasheet and mean different things. UL Recognized describes a part. It says nothing yet about your finished device. In UL's words, component recognition is not a certification for a complete, standalone product (as of November 2026).
| Topic | UL Listed (end product) | UL Recognized (component) | What it means for you |
|---|---|---|---|
| What it covers | A complete end product. | A part built into a larger end product. UL says it is not a certification for a complete, standalone product. | Your finished device still needs its own evaluation. |
| Conditions | Listed equipment must be installed and used per the instructions in the listing or labeling. | Conditions of acceptability set how the part must be used. UL says using it outside them can void the certification. | Read the conditions before you place the part, and plan change control. |
| Mark | UL Listed Mark on the product. | UL Recognized Component Mark, which UL calls distinct from the Listed Mark. | A Recognized mark on a part does not cover your device. |
Sources: 29 CFR 1910.399, 1910.303(b)(2) and UL Solutions, as of November 2026. The last column is our engineering reading.
Recognized parts can make the end-product evaluation shorter. UL says they can simplify end-product certification and reduce re-testing. A recognized cell, wire or enclosure plastic comes with conditions the lab can check against your design. A part with no listing may need its own testing inside your product.
Is UL certification required by law, and who asks for it?
We found no general federal rule that requires a UL listing for consumer electronics. The request usually comes from the people who buy, sell or use the product. The table shows the askers we could source, and says so where we could not.
| Who | What they require | What to do | Source |
|---|---|---|---|
| Employers, for workplace equipment | OSHA electrical rules accept equipment only if approved. An NRTL listing, label or certification is the main way to show approval. | Matters when staff use your device at work. | 29 CFR 1910.303 and 1910.399, as of November 2026 |
| CPSC, for coin or button cells | 16 CFR part 1263 makes ANSI/UL 4200A-2023 mandatory for consumer products that contain or use these cells. Zinc-air cells are excluded. | Applies whether or not you seek a UL listing. | CPSC guidance, as of November 2026 |
| Retailers and enterprise buyers | Terms vary by buyer. We have no primary source for any specific buyer rule, so we quote none. | Get the requirement in writing: the standard, the accepted marks or labs, and the date proof is due. | Our guidance, no primary source |
The workplace rule matters if you sell a voice badge, tracker or companion device to companies. The employer is bound by 29 CFR 1910.303(a), which accepts equipment only if approved. Under 1910.399, custom equipment built for one customer has a separate path based on the maker's test data, which the employer keeps.
Which safety standards does a battery-powered device usually meet?
Most connected consumer devices fall under the safety standard for audio, video and information and communication technology equipment. The battery has its own standards, and coin cells have a federal rule.
| Part of the device | Standard | What the public text says | Source |
|---|---|---|---|
| The whole device | UL 62368-1 / IEC 62368-1 | Edition 4 of UL 62368-1, dated July 31, 2025, is active and adopts IEC 62368-1 edition 4 (May 2023). Its scope covers audio, video, information and communication technology, and business and office machines, with a rated voltage not exceeding 600 V. | Public page, as of November 2026 |
| Lithium battery inside the device | IEC 62368-1 battery requirements | The standard carries battery requirements for the equipment. The IEC webstore lists a revision of them among the 2014 edition changes. The clause text is paywalled. | Public page, as of November 2026 |
| The lithium cell or pack | IEC 62133-2:2017 | Requirements and tests for safe operation of portable sealed secondary lithium cells and batteries, under intended use and reasonably foreseeable misuse. | Public page, as of November 2026 |
| The battery pack, US | UL 2054, Household and Commercial Batteries | Edition 3, published November 17, 2021, is active. It covers portable primary and secondary batteries used as power sources in products, to reduce the risk of fire or explosion. The battery combined with the host product falls under the host product standard. | Public page, as of November 2026 |
| A coin or button cell | IEC 62368-1; ANSI/UL 4200A-2023 | The IEC webstore lists new requirements for coin or button cell batteries among the 2014 edition changes. The CPSC rule makes UL 4200A mandatory in the US. | Public page, IEC webstore, as of November 2026 |
| Sound near the ear | IEC 62368-1 acoustic requirements | The IEC webstore lists acoustic shock requirements for personal music players among the 2014 edition changes. | Public page, as of November 2026 |
How IEC 62368-1 looks at a device
Edition 4.0 was published on May 26, 2023. Its abstract says it classifies energy sources and prescribes safeguards against them, to reduce the likelihood of pain, injury and, in the case of fire, property damage (IEC webstore, as of November 2026). The full text is paywalled, so we do not list its clauses. For a wearable, review the battery requirements and, if it plays sound near the ear, the acoustic requirements early. The lab decides what applies from your schematic, enclosure and battery data.
Where the battery fits
Treat the cell or pack and the device as separate layers. The cell or pack carries its own report, for example to IEC 62133-2 or UL 2054; see the battery safety standards checklist. UL 2054 says the battery combined with the host product is covered by the host product standard (UL store listing, as of November 2026). So the device evaluation looks at how your charger, protection circuit and enclosure treat that cell. Shipping the battery is another track; see shipping a LiPo wearable under UN 38.3.
How do you check a UL claim and keep it valid?
A vendor saying UL approved is a claim you can check. Run these checks on every safety-relevant part and on any finished product you buy in, such as a power adapter.
| Check | How to do it | Source |
|---|---|---|
| Find the listing | Search a keyword or the file number in UL Product iQ, which UL offers for verifying the certification of a product or component. | Public page, as of November 2026 |
| Match the exact part | A similar part number, a new revision or a second cell source may not be on the listing. Ask for the page that shows your part. | Our guidance |
| Read the conditions | Product iQ lets designers review a recognized component's conditions of acceptability. Compare them with your enclosure, temperature and power design. | Public page, as of November 2026 |
| Confirm the lab | OSHA's current list names 21 NRTLs as of November 2026, including UL LLC, Intertek, CSA Group, TUV Rheinland and TÜV SÜD America. | Public page, as of November 2026 |
Change control is where listings get lost. A pilot build may swap a cell source, charger IC or adapter to save time. Each swap can move the product outside what the lab evaluated. Lock a short list of safety-critical parts at design freeze, and route changes through whoever owns the lab relationship.
When should you plan for a UL listing?
Before the buyer asks. Safety testing runs on near-final hardware, and the choices that decide the result are made months earlier. The plan column is our engineering guidance.
| Your situation | What to plan |
|---|---|
| A buyer asked for a listing | Get the written requirement, pick an NRTL that covers the standard, and book the lab after design freeze, in parallel with FCC testing. |
| Staff will use it at work | Assume the employer needs an NRTL-approved device. Ask which marks they accept. |
| It has a coin or button cell | The CPSC rule applies anyway. Plan the battery compartment and UL 4200A testing from the first enclosure sketch. |
| Small pilot, no request yet | Design to IEC 62368-1 anyway. Choose a cell with an IEC 62133-2 report and a listed adapter, so a later listing does not force new tooling. |
For how radio certification is scheduled, see certification timeline planning for an AI wearable. Before your next design review, ask your hardware team:
- Who asked for a listing, and do we have the standard and accepted marks in writing?
- Which standard and edition will the lab use for our device?
- Does the cell have an IEC 62133-2 report or UL 2054 listing for the exact part we buy?
- Do the cell and charger conditions of acceptability match our design?
- Is the power adapter listed on its own?
- Which parts are locked after listing, and who approves a change?
Questions about UL certification
Is UL certification required by law in the US?
We found no general federal rule that requires a UL listing for consumer electronics, so the request usually comes from buyers. Two cases carry legal weight as of November 2026: OSHA's workplace electrical rules accept equipment as approved when an NRTL lists, labels or certifies it (29 CFR 1910.399), and the CPSC makes ANSI/UL 4200A-2023 mandatory for consumer products with coin or button cells (16 CFR part 1263). This is not legal advice.
Can a lab other than UL certify my device to a UL standard?
OSHA's definitions refer to a nationally recognized testing laboratory, and its current list names 21 NRTLs as of November 2026, UL LLC among them (OSHA list). Whether your buyer accepts another lab's mark is a question for the buyer, so ask before you pick a lab.
If every part inside is UL Recognized, is my product UL Listed?
No. UL says component recognition is not a certification for a complete, standalone product (UL Solutions). Recognized parts can reduce re-testing, but the finished device still needs its own evaluation.
What does Duobay do if a buyer asks for a UL listing?
At Gate 0 we record any safety standard your buyer requires as a requirement and a risk item. Certification and lab fees are paid by the client. Tell us about your device.
If a buyer has asked for a safety listing, tell us about your device. At Gate 0 we record the standard as a requirement and a risk item; certification and lab fees are paid by the client. You can also read how FCC certification is planned from Gate 0.
Sources
All pages accessed November 5, 2026. Rules and standards are revised, so confirm the current edition and text before you decide.
- OSHA, 29 CFR 1910.399, definitions (approved, acceptable, listed, labeled, certified): https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.399
- OSHA, 29 CFR 1910.303, general requirements (approval; installation and use): https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.303
- OSHA, Nationally Recognized Testing Laboratory Program: https://www.osha.gov/nationally-recognized-testing-laboratory-program
- OSHA, Current List of NRTLs: https://www.osha.gov/nationally-recognized-testing-laboratory-program/current-list-of-nrtls
- CPSC, Button Cell and Coin Battery business guidance (16 CFR part 1263): https://www.cpsc.gov/Business--Manufacturing/Business-Education/Business-Guidance/Button-Cell-and-Coin-Battery
- UL Solutions, The UL Component Recognition Classification: https://www.ul.com/thecodeauthority/knowledge/ul-component-recognition-classification
- UL Solutions, Components: https://www.ul.com/industries/products-and-components/components
- UL Solutions, Product iQ: https://www.ul.com/software/product-sourcing-and-certifications-database
- UL Standards & Engagement store, UL 62368-1 edition 4 (scope, status): https://www.shopulstandards.com/ProductDetail.aspx?productId=UL62368-1
- IEC webstore, IEC 62368-1:2023: https://webstore.iec.ch/en/publication/69308
- IEC webstore, IEC 62368-1:2014 (list of technical changes): https://webstore.iec.ch/en/publication/6932
- IEC webstore, IEC 62133-2:2017: https://webstore.iec.ch/en/publication/32662
- UL Standards & Engagement store, UL 2054 edition 3 (scope, status): https://www.shopulstandards.com/ProductDetail.aspx?productId=UL2054
Planning a device like this? Tell us what it needs to do. A Duobay engineer replies within 1 business day. Send a project brief →