UL 2231 is the North American safety standard for personnel protection systems in EV supply circuits — the protection built into a charger that reduces the risk of electric shock while you charge. When a testing laboratory lists an EV charger, UL 2231 is the part of the evaluation covering people, alongside UL 2594 for the equipment and UL 2251 for the plugs and connectors.
Key Takeaways
- UL 2231 covers personnel protection in EV supply circuits — the shock-protection layer of a listing.
- It works alongside UL 2594 (the equipment) and UL 2251 (the connectors) in one listing file.
- The protection is built into the charger, centred on the charge circuit interrupting device.
- Equipment protection and circuit protection are separate layers; a listed charger still needs a code-compliant circuit.
One Family, Three Jobs
North American charger listing is not judged against a single document. The standards divide the work between them:
| Standard | Covers | In plain terms |
|---|---|---|
| UL 2594 | EV supply equipment rated up to 1000 V ac, including cord sets and fixed charging stations | The charger as a product |
| UL 2231 | Personnel protection systems that reduce the risk of electric shock in EV supply circuits | Keeping people safe while the equipment does its job |
| UL 2251 | Plugs, receptacles, vehicle inlets, connectors and breakaway couplings, up to 800 A and 1000 V ac or 1500 V dc | The hardware you pick up and plug in |
A laboratory tests each charger against the standards that apply to its design, so a listing file names several standards at once. Our guide to UL and ETL listing for EV chargers explains how that listing process works from application to follow-up inspections.
What Personnel Protection Does Inside the Charger
The device at the centre of UL 2231 is the charge circuit interrupting device — the CCID — built into the supply equipment. Its job is simple to state: watch the charging circuit and interrupt the power if a fault could leave accessible parts live. It works as part of the charger’s wider monitored behaviour: the connector stays unpowered until a car is properly connected, the session is supervised while it runs, and power is cut when the session ends or something goes wrong. It exists as its own standard because this protection is engineered into the charging system itself, and must be evaluated with the equipment it protects rather than assumed from the building’s wiring.
Not the Same Question as a GFCI Breaker
Buyers often meet this topic through a different door: whether the circuit feeding the charger needs GFCI protection. That is a question about the building’s wiring, answered by the National Electrical Code, the charger’s manual and your electrician — our article on whether an EV charger needs GFCI protection covers it. UL 2231 is the other layer: protection designed into the equipment and tested with it. The two layers are not substitutes for each other. A listed charger still goes on a code-compliant circuit, and a protected circuit does not make an unlisted charger safe.
What It Means When You Buy
- Look for the mark, then read the file. The number 2231 rarely appears on the box. What you see is the NRTL mark — UL or ETL; the standards sit behind it in the laboratory’s listing entry for that model.
- Listing judges the whole product. A charger built from individually recognised components is not the same as a charger evaluated as a complete end product; personnel protection is part of that whole-product judgement.
- Marks vary by model. Two chargers from one manufacturer can carry different listings. Ask for the certificate for the exact model and configuration you are buying, as our certifications explained guide recommends.
The EVDANCE EV-ACT5006T 48A Level 2 wall charger carries ETL, FCC and CE listings, runs up to 48 A hard-wired or on a NEMA 14-50 plug, and ships with a 25 ft cable. The full range is on the EVDANCE products page, and the certificate for a specific model is available on request. EVDANCE is a Shenzhen manufacturer founded in 2011 and exports to 30+ countries.
Frequently Asked Questions
Should I look for “UL 2231” printed on the charger?
Look for the NRTL mark first — UL or ETL. UL 2231 is one of the standards the laboratory evaluated to grant that listing, and it is named in the listing file, which you can check in the lab’s online directory.
Does a charger evaluated to UL 2231 still need circuit protection?
Yes — equipment protection and circuit protection are separate layers. Your electrician installs the circuit to the National Electrical Code and the manufacturer’s instructions, whatever the charger’s listing covers.
Is UL 2231 used outside North America?
No. It belongs to the North American listing system run through OSHA-recognised laboratories. Other markets use their own frameworks, such as the IEC 61851 family behind CE marking in Europe.
Related Reading
- Are Home EV Chargers Safe?
- UL and ETL Listing for EV Chargers: How NRTL Certification Works
- EV Charger Certifications Explained: CE, UKCA, UL, ETL, CB
