UL vs ETL: Which Safety Certification Mark Do You Need?

The short answer

UL and ETL are both NRTL marks. They are legally equivalent. An ETL-listed product has the same regulatory standing as a UL-listed product -- same jurisdictions, same AHJ offices, same retailer compliance departments.

The differences are price, speed, and perception. UL costs more and takes longer but has stronger brand recognition. ETL through Intertek costs 25-50% less, moves 2-4 weeks faster, and is accepted everywhere UL is. For most hardware startups, ETL is the right call.

The full picture is more complicated than "pick the cheaper one," though. This guide covers the NRTL system, side-by-side comparison, retailer policies, AHJ acceptance, real cost numbers, and the specific situations where the UL premium is actually worth paying.

What these marks actually mean

Both marks mean the same thing: an OSHA-recognized Nationally Recognized Testing Laboratory (NRTL) tested the product and it passed applicable safety standards. The testing covers electric shock, fire, thermal burns, and mechanical injury. It does not cover EMC or radio emissions -- that is FCC certification, a completely separate process.

flowchart TD
    A["OSHA"] -->|"Recognizes under\n29 CFR 1910.7"| B["22 NRTLs"]
    B --> C["UL Solutions\n(UL mark)"]
    B --> D["Intertek\n(ETL mark)"]
    B --> E["CSA Group\n(CSA mark)"]
    B --> F["19 others"]
    C -->|"Tests against\nsame standards"| G["Product\nListed"]
    D -->|"Tests against\nsame standards"| G
    G --> H["AHJs, retailers,\ninsurers accept\nany NRTL mark"]
    style A fill:#1e3a5f,color:#fff
    style G fill:#1e3a5f,color:#fff
    style H fill:#1e3a5f,color:#fff

UL Solutions (formerly Underwriters Laboratories) is the largest and oldest NRTL, founded in 1894. They write over 1,500 UL/ANSI safety standards and also test products against them. When people say "UL certified," they usually mean the product has a UL Listed mark.

Intertek issues the ETL mark. The name goes back to Edison Testing Laboratories, founded in 1896 by Thomas Edison. Intertek is the second-largest NRTL. They test against the same UL/ANSI standards but do not write them.

Both organizations conduct quarterly factory inspections, maintain product directories, and are recognized by OSHA under 29 CFR 1910.7.

The NRTL system in 60 seconds

OSHA requires electrical equipment used in US workplaces to be tested by an NRTL. Local building codes extend this to products installed in commercial and residential buildings. Major retailers extend it further by refusing to stock products without an NRTL mark.

There are 22 OSHA-recognized NRTLs. All their marks carry the same legal weight. An Authority Having Jurisdiction -- your local building inspector, fire marshal, or electrical inspector -- must accept an ETL mark the same way they accept a UL mark. This is not a suggestion. It is federal policy under OSHA's NRTL program.

Three NRTLs handle most consumer electronics certifications: UL (60-70% market share), Intertek/ETL (15-20%), and CSA Group (5-10%). The other 19 NRTLs split a small share, mostly in specialized industrial sectors.

Side-by-side comparison

This is the reference table. The rest of the guide goes deeper on each row.

What they test

This is the part that confuses people the least, but it is worth stating clearly: UL and Intertek test your product against the same standards. For most consumer electronics, IoT devices, and IT equipment, that standard is UL 62368-1 (the US adoption of IEC 62368-1). The testing scope is identical no matter which NRTL you pick:

Same standards, same test procedures, same pass/fail criteria. A product that passes UL 62368-1 testing at Intertek has met exactly the same requirements as one tested at UL. The only difference is which logo goes on your label.

Cost comparison

This is where the decision usually gets made. Intertek prices below UL consistently -- 25-50% lower for initial certification, and moderately lower for ongoing maintenance.

Initial certification

Ongoing annual costs

Over a three-year product lifecycle, the difference between UL and ETL can be $30,000 to $60,000. For a startup shipping its first product, that is real money.

Why UL costs more

UL is the market leader with the strongest brand, and they price accordingly. They also write the standards everyone tests against, and that standard-development work is partly funded by certification revenue. Their project management tends to be more structured -- some teams appreciate the hand-holding, others find it bureaucratic.

Intertek competes on price and speed because they have to. Without UL's brand advantage, they win business by being faster and cheaper. That is not a knock on Intertek -- it is a straightforward competitive strategy, and it works out well for customers.

Timeline comparison

For a startup trying to hit a launch date, the speed difference between UL and ETL can matter as much as the cost difference.

gantt
    title Certification Timeline Comparison
    dateFormat YYYY-MM-DD
    axisFormat %b %d

    section UL Path
    Application + scoping         :ul1, 2026-06-01, 14d
    Construction review           :ul2, after ul1, 21d
    Safety testing                :ul3, after ul2, 28d
    Findings + resolution         :ul4, after ul3, 28d
    Factory inspection + listing  :ul5, after ul4, 14d

    section ETL Path
    Application + scoping         :etl1, 2026-06-01, 7d
    Construction review           :etl2, after etl1, 14d
    Safety testing                :etl3, after etl2, 21d
    Findings + resolution         :etl4, after etl3, 21d
    Factory inspection + listing  :etl5, after etl4, 7d

Intertek is not faster because they cut corners. Same tests, same standards. The difference comes down to queue times and scheduling. UL handles more volume, so their queues are longer. Intertek's smaller share of the market means they can often get you on the schedule sooner.

AHJ acceptance: the question everyone asks

"Will my local building inspector accept an ETL mark?" Yes.

AHJs (Authorities Having Jurisdiction) are the local officials who approve electrical installations -- building inspectors, fire marshals, electrical inspectors. Under OSHA's NRTL program, they are required to accept any NRTL mark. An AHJ who rejects a product solely because it carries an ETL mark instead of a UL mark is acting outside their authority.

That said, some AHJs are not familiar with ETL. This is not a legal problem -- it is a recognition problem. If an inspector questions your ETL mark, point them to OSHA's NRTL directory, which lists Intertek with full scope for your product category. In practice, this almost never comes up for consumer electronics. It occasionally happens in commercial construction and industrial installations, where some inspectors have been looking at UL marks for 30 years and need a minute to process the alternative.

Retailer requirements

Major retailers require NRTL safety certification for electrical products. None of them require UL specifically. Any NRTL mark works.

One wrinkle at Home Depot and Lowe's: individual category managers sometimes prefer UL. This is not corporate policy -- it is personal familiarity. If a category manager pushes back on ETL, escalating to their compliance team resolves it. Their corporate policy accepts all NRTL marks. Uncommon, but worth knowing about if you sell through these channels.

Amazon's compliance program verifies that electrical products carry an NRTL mark. Their automated checks accept ETL, CSA, TUV, and other NRTL marks alongside UL. No preference in the system.

The perception gap

Now for the honest part. UL and ETL are legally identical, but not everyone sees them that way.

UL has been the dominant safety mark in America for over 130 years. Consumers recognize it. Purchasing departments recognize it. Insurance adjusters recognize it. The UL mark has accumulated a level of implicit trust that goes beyond its legal meaning. When a product liability attorney examines a product after an incident, seeing a UL mark sends a different signal than an ETL mark -- not in court, but in the attorney's head.

This gap is narrowing as more manufacturers discover the cost and speed advantages of ETL. But it still exists, and in certain product categories it matters.

Where the perception gap matters

Children's products. Parents are cautious, retailers are cautious, and the UL mark provides an extra layer of "we take safety seriously" signaling that ETL does not carry to the same degree.

Medical-adjacent devices. Home health monitors, CPAP accessories, UV sanitizers -- anything used in or near healthcare settings faces extra scrutiny from purchasers. UL's brand pulls more weight here.

Premium consumer electronics. A $500+ device at Best Buy or specialty retail benefits from UL's brand reinforcement. A $20 smart plug does not.

Industrial and commercial equipment. Facility managers and procurement teams at large organizations sometimes write "UL listed" into purchasing specs. Technically wrong (any NRTL mark satisfies the safety requirement), but it happens, and fighting procurement specs is nobody's idea of a good time.

Where the perception gap does not matter

IoT devices and sensors. Nobody buying a temperature sensor cares which lab tested it.

B2B electronics. Your customer's compliance team knows all NRTL marks are equivalent. They check the box and move on.

Products sold online. Consumers on Amazon are not inspecting safety marks before clicking "Add to Cart."

Budget and mid-range consumer electronics. The person buying a $30 LED strip kit is not comparison-shopping based on which NRTL mark is on the box.

Common misconceptions

A few myths keep circulating in forums and among first-time certifiers. Worth clearing up.

"UL is required by law." It is not. OSHA requires an NRTL mark for workplace electrical equipment -- any NRTL, not specifically UL. For consumer products, NRTL certification is not legally required at all. Retailers require it, and liability exposure makes it unwise to skip, but there is no statute mandating UL.

"ETL is a lesser certification." Same standards, same OSHA requirements, same quarterly factory inspections. The testing rigor is identical. ETL's lower price does not mean lower quality -- it means Intertek competes on cost.

"AHJs can reject ETL marks." They cannot. AHJs must accept any OSHA-recognized NRTL mark. An inspector who refuses an ETL mark is acting outside their authority, full stop.

"UL-listed products are safer." A product either meets the standard or it does not. The lab that ran the tests does not change the safety of the product. Both UL and Intertek apply the same pass/fail criteria from the same published standard.

"Switching from UL to ETL requires full recertification." Not quite. The new NRTL does their own evaluation, but they can reduce scope by reviewing your existing test data. Figure 50-75% of the cost of a fresh certification and 4-8 weeks. Same process in either direction.

"UL writes the standards, so their testing is more authoritative." UL does write most UL/ANSI safety standards. But those are published documents with defined test procedures that any qualified lab follows. Writing the dictionary does not make you better at spelling.

How to decide

flowchart TD
    A["Choosing between\nUL and ETL"] --> B{"Is budget a\nprimary concern?"}
    B -->|"Yes"| C["ETL\n25-50% savings"]
    B -->|"No"| D{"Product category?"}
    D -->|"Children's products\nMedical-adjacent\nPremium retail"| E["UL\nBrand recognition\nworth the premium"]
    D -->|"General consumer\nelectronics, IoT,\nB2B"| F{"Timeline\npressure?"}
    F -->|"Tight launch\ndeadline"| G["ETL\n2-4 weeks faster"]
    F -->|"Comfortable\nschedule"| H["Either works\nDefault to ETL\nunless you have a\nspecific reason for UL"]
    style C fill:#1e3a5f,color:#fff
    style E fill:#1e3a5f,color:#fff
    style G fill:#1e3a5f,color:#fff
    style H fill:#1e3a5f,color:#fff

Choose ETL if:

• You are a startup or growth-stage company watching your budget
• You need the fastest possible path to market
• Your product is general consumer electronics, IoT, or B2B equipment
• You sell primarily online or through channels where the specific NRTL mark does not influence purchasing decisions

Choose UL if:

• You are building a premium brand and the UL mark reinforces that positioning
• Your product is in a risk-sensitive category (children's products, medical-adjacent, high-power appliances)
• Key retail partners or enterprise customers have a stated UL preference
• International recognition matters and you want the most widely known safety mark globally
• Budget is not a primary constraint and you value UL's project management structure

For most hardware teams, the default is ETL. Save the money. Ship faster. If you later discover that specific customers or channels want UL, you can switch. The switching cost (50-75% of a new certification) is real but manageable, and you might never need to do it.

What about CSA and other NRTLs?

UL and ETL are not the only options. CSA Group and several other NRTLs also certify consumer electronics.

If you are selling in both the US and Canada, CSA is worth considering. A single CSA certification can cover both markets, which simplifies logistics compared to separate US and Canadian certifications. For dual US/EU compliance, TUV Rheinland or TUV SUD can handle both your NRTL listing and CE marking in one engagement.

Combining safety and EMC testing

Both UL and Intertek also do FCC testing. Running your FCC and safety programs through a single lab cuts logistical overhead and sometimes gets you bundled pricing.

If you are planning FCC certification (and you almost certainly are -- most electronic products need both FCC and safety certification for the US market), ask your lab for a combined FCC + safety quote. The discount is not dramatic, but dealing with one lab instead of two has real operational value.

The CB Scheme: going international

Both UL and Intertek participate in the IECEE CB Scheme, which lets test results from one lab be accepted in other member countries. If you are selling globally, this matters.

A CB Test Certificate issued alongside your US safety certification lets you skip full retesting in the EU, Japan, Australia, and other member countries. The local certification body reviews your CB report against their national deviations and issues a local certificate -- much cheaper than starting over.

Neither UL nor Intertek has an advantage here. Both are full IECEE members, both issue CB Test Certificates, and the process works the same regardless of which one you use.

Factory inspections: same deal either way

Both UL and Intertek conduct quarterly factory inspections to maintain your listing. Same scope, same frequency.

An inspector visits your manufacturing facility (or your contract manufacturer's facility) four times a year and checks:

• Production samples match the listed configuration
• Safety-critical components are traceable to approved suppliers
• Production line hipot and ground continuity testing is in place
• Labels and marks are correctly applied
• Records are maintained

If the inspector finds a discrepancy, they issue a variation notice. Unresolved variation notices can lead to suspension of the listing.

Some manufacturers say UL inspectors are more thorough; others say Intertek inspectors are more practical. These are individual inspector differences, not organizational ones. Your mileage will vary.

Making the switch

If you start with one NRTL and want to switch later, it is not a simple transfer. The new NRTL does their own evaluation. They can reduce scope by reviewing your existing test data and reports, but they will not rubber-stamp another organization's work.

You can maintain listings with both NRTLs at the same time, but few companies bother. Paying for two sets of factory inspections and file maintenance fees rarely makes sense.

The bottom line

UL and ETL are equivalent safety certifications. Same standards, same OSHA requirements, same acceptance by AHJs, retailers, and insurers.

Three questions settle it:

1. Can your budget absorb the UL premium? If not, ETL saves you 25-50% with zero regulatory downside.

2. Is your product in a category where UL's brand matters? Children's products, medical-adjacent devices, and premium retail placements are the main cases. For everything else, the brand premium is wasted.

3. Do you have timeline pressure? ETL is 2-4 weeks faster. If you are racing a holiday launch window or a funding milestone, that gap matters.

If none of those point to UL, go with ETL. Spend the savings on engineering, inventory, or marketing -- not on a safety mark that most of your customers will never look at.

For the full safety certification process, costs, and how to prepare your product for testing, see our UL certification guide. For the EMC side of US compliance, see our FCC certification guide.

Related guides

• UL certification guide -- full NRTL process, costs, standards, and preparation
• CE vs FCC -- how US and EU certification systems differ
• FCC vs CE vs ISED -- multi-market EMC comparison
• FCC certification guide -- the other half of US compliance