UL 2202 vs. UL 2594: Which Standard Applies to Your EV Charger

# UL 2202 vs. UL 2594: Which Standard Applies to Your EV Charger

Procurement teams run into this question in a predictable way. A supplier's spec sheet says "UL certified," the quote covers both AC pedestals and DC fast chargers, and somewhere in the paperwork is a single certificate number that is supposed to cover everything. It does not. North America has two separate safety standards for EV charging equipment, and which one applies depends on one fact about the product: does it do the AC-to-DC conversion, or does it pass AC power through to the vehicle? This article gives you the comparison, the reasoning behind it, and the verification steps. For the deeper treatment of what UL 2202 covers section by section, see our UL 2202 explained article.

The quick answer

If you remember one row, make it the fifth. An AC charger is a smart, safe switch: it delivers grid AC to the vehicle, and the vehicle's onboard charger converts it to DC for the battery. A DC fast charger does the conversion in the cabinet and delivers DC straight to the battery. That single engineering difference is why two standards exist.

Why UL 2202 vs UL 2594 matters

The risk profiles are different enough that one document could not cover both sensibly.

An AC charger tops out at 250 VAC and under 20 kW on single-phase service. The dominant hazards are shock protection on the AC side, ground-fault detection, thermal management at sustained residential-scale loads, and the control pilot handshake that tells the vehicle how much current it may draw. The electronics are comparatively simple. The failure modes are mostly ones the industry has understood for decades, because the equipment is close in spirit to a large appliance.

A DC fast charger contains a full power conversion plant: rectifiers, DC-link capacitors, isolated output stages, often liquid-cooled cables, and output voltages up to 1,000 VDC at currents of 250 A or more per connector. The hazards include arc flash, DC isolation faults, capacitor stored energy after shutdown, connector overheating at hundreds of amps, and safety-critical software controlling the whole sequence. UL 2202 exists because evaluating that equipment against a standard written for a 7.2 kW wall box would miss most of what can actually hurt someone.

There is a practical consequence for buyers here. Because the DC standard covers a power conversion system, the test program is longer, the factory follow-up inspection scope is wider, and the engineering gap between a certified and an uncertified product is larger. An uncertified AC charger might still be a competent piece of hardware. An uncertified DC fast charger is a power electronics product of unknown design quality sitting in a public place, and no datasheet claim substitutes for the third-party evaluation.

This is also why the standards sit under different category codes in the UL directory. Our DC line is listed under FFTG in the US and FFTG7 in Canada, the category for EV charging system equipment. AC EVSE sits in its own category. The category code on a certificate is the fastest way to tell which standard family a listing belongs to.

What UL 2202 covers, briefly

UL 2202, currently the 3rd Edition issued 2022-12-15, evaluates DC charging system equipment as a system: enclosure, power conversion, DC output protection, connector and cable assembly, and the control functions that manage the session. On split-type systems, both the power cabinet and the dispenser are in scope, which is why our certificate UL-US-2583475-0 lists two models, the DC550KSK01 dispenser and the DC480TFS01 power cabinet. Canadian coverage runs through CSA C22.2 No. 346.

The DC-specific requirements are the ones to remember: isolation monitoring between the high-voltage DC bus and ground, pre-charge sequencing, output shutdown on communication loss, and connector temperature rise at rated current. None of these exist in AC equipment because none of these hazards do.

What UL 2594 covers, briefly

UL 2594, "Electric Vehicle Supply Equipment," covers AC charging equipment up to 250 VAC, in practice the Level 2 units from 7.2 kW to 19.2 kW. It is an end-product standard: the finished station is tested as a unit, including the enclosure, the cable and connector management, ground-fault protection, and the SAE J1772 control pilot handshake that coordinates the session with the vehicle. The current edition referenced in listings is UL 2594:2022, typically paired with CSA C22.2 No. 280 for Canada.

Our pedestal AC line carries UL certification; our EVC model family carries ETL certification to UL 2594:2022 and CSA C22.2 No. 280:2022. ETL is Intertek's mark, and the underlying testing is to the same UL standard; the ETL vs UL comparison explains what differs on paper and what does not. The full AC treatment is in our UL 2594 article.

Where the two overlap

The standards are separate, but the component-level requirements beneath them are shared. Three come up repeatedly in certification files:

So a supplier telling you "the connector is UL 2251 certified" has told you something true and something insufficient. UL 2251 covers the connector as a component. It says nothing about the charger it is attached to. Component certifications are inputs to the end-product evaluation, not substitutes for it.

Installation is also shared ground: NEC Article 625 governs how both AC and DC charging equipment gets installed in the US, covering branch circuits, disconnects, and location requirements. Product certification and installation code are separate layers. A UL 2202 certified charger installed against Article 625 is still a code violation, and the authority having jurisdiction will not accept the certificate as an excuse.

One more overlap worth knowing: both standards assume the equipment will be inspected as part of the installation. The product listing and the electrical inspection answer different questions, and a project needs both to close out. Buyers who treat certification as the finish line sometimes discover this at commissioning, when the inspector asks for things the factory never controlled, like conductor sizing and disconnect placement.

Red flags when a supplier claims one cert covers both

This comes up often enough that it deserves its own list.

• A single certificate number quoted for a product family that includes both AC and DC models. UL certificates are per product class and per model. One number covering both classes is not how the system works.
• A DC fast charger whose documentation references UL 2594. That standard caps at 250 VAC. A 150 kW DC unit cannot be listed to it.
• An AC charger marketed as "UL 2202 compliant." The standard is for DC charging system equipment; an AC wall box is out of scope.
• A component mark presented as product certification. "UL recognized" power modules or UL 2251 connectors do not make the finished charger a listed product.
• "Complies with UL 2202" or "designed to UL 2594" with no certificate number, no directory listing, and no laboratory name. Compliance language without a listing is marketing, not certification.

Any one of these is a reason to pause the purchase until the paperwork is straight. The broader failure patterns are covered in our article on certification compliance risks.

There is a legitimate edge case that confuses the picture: some products genuinely sit near the boundary. High-power AC equipment above the common Level 2 range, and DC units with unusual architectures, can require the laboratory to decide which standard and which category applies. In those cases the right answer comes from the certification body, not from the supplier's marketing team. If a product seems to fall between the two standards, ask the supplier which laboratory made that determination and get the answer in writing.

What this means for a mixed AC and DC project

Most real deployments are mixed. A fleet depot might run Level 2 AC units for overnight dwell charging and a DC fast charger for mid-day turnarounds. A retail site might pair AC pedestals for customers with a DC unit for fleet vehicles. When the quote arrives with both product types on it, the certification documentation should arrive as two distinct packages: UL 2594-based listings for the AC side, UL 2202-based listings for the DC side, with different certificate numbers, different category codes, and different covered models.

Budget for this at the specification stage. The cleanest approach is to write the standard into the line item: "AC EVSE, listed to UL 2594:2022" and "DC fast charging system, listed to UL 2202, 3rd Ed." That one sentence in an RFP eliminates most of the ambiguity before the first proposal comes back, and it gives you contractual ground to stand on if the delivered documentation does not match.

How to verify which standard applies, and whether the cert is real

1. Classify the product. If it outputs DC to the vehicle, UL 2202 applies. If it passes AC through, UL 2594 applies. When a project includes both, expect two certifications, possibly from different laboratories.
2. Ask for the certificate number and the laboratory. UL listings verify at UL Product iQ (iq.ulprospector.com). ETL listings verify at the Intertek directory. Both are free to search.
3. Check the category and the standard edition on the listing. FFTG for DC charging system equipment under UL 2202 3rd Ed.; the EVSE category under UL 2594:2022 for AC. For Canada, the paired CSA standards are C22.2 No. 346 and C22.2 No. 280 respectively.
4. Match the covered models to your quote. The certificate boundary is the model list, not the brand.
5. Confirm the listing is active, which reflects the factory follow-up program being in place. A certificate alone does not authorize the certification mark; the follow-up services authorization does.

The general reading method, including how the certificate number, holder, and follow-up clause fit together, is in UL certification for EV chargers.

The bottom line

UL 2202 and UL 2594 are not interchangeable labels for the same kind of testing. They exist because AC and DC charging equipment are electrically different products with different hazards, and the certification system treats them accordingly. AC Level 2 equipment belongs under UL 2594, DC fast charging systems under UL 2202, and any supplier whose paperwork blurs that line should expect hard questions from a competent buyer. Verify the standard, the category, the models, and the listing status, and the confusion disappears quickly.

For what UL 2202 actually contains section by section, continue to our UL 2202 standard explained article. If you are sourcing both AC and DC hardware and want certificates with the quote, contact our team.