Key takeaways
- Class 2 concerns an output-circuit classification in the North American context; Class II concerns equipment insulation; SELV concerns an electrical system.
- Keep the exact wording, model, output and applicable standard with each claim rather than translating one term into another.
- A nominal output voltage, enclosure appearance or matching wattage does not establish these classifications.
- Review the driver, connected load, controls and installation as an identified combination before approval.
What is the difference between Class 2, Class II and SELV?
Class 2, Class II and SELV are not interchangeable descriptions of an LED driver. In North American documentation, Class 2 concerns an output circuit and its applicable power limits. IEC Class II describes equipment whose basic and fault protection are provided by double or reinforced insulation. SELV (safety extra-low voltage) describes a system whose voltage remains within extra-low-voltage limits under normal and specified single-fault conditions.
A useful comparison starts by asking what is being classified: an output, a piece of equipment or the connected system. Preserve the Arabic numeral in Class 2 and the Roman numeral in Class II when writing an RFQ, quotation or approval schedule.
| Term | Main question | Evidence to request |
|---|---|---|
| Class 2 | Does the identified output meet the applicable Class 2 requirements? | Exact output, model, standard and evaluation scope |
| Class II | How does the equipment provide basic and fault protection? | Double/reinforced-insulation classification and model documentation |
| SELV | How is the system kept within ELV under normal and single-fault conditions? | Source, circuit arrangement, interfaces and supporting system requirements |
Read Class 2 as an output claim with a defined scope
UL 1310, Class 2 Power Units, provides one relevant example. Its published scope describes covered power units using an isolating transformer, with each output providing Class 2 power levels in accordance with the National Electrical Code, NFPA 70. This makes the particular output and the applicable requirements important; a product's total advertised wattage is an incomplete purchasing record.
UL 1310 is not the only standard relevant to LED drivers. Ask which standard and product evaluation support the offered model and output. UL's 2020 discussion of UL 8750 also distinguishes output-power circuits from wired-control circuits. Do not assume a control connection has the same evaluated scope as the LED output merely because both appear on one driver.
Read Class II as equipment protection by insulation
IEC Electropedia defines Class II equipment by the provision of both basic protection and fault protection through double insulation or reinforced insulation. The question is the equipment's protective construction, rather than its nominal output voltage or its suitability for one LED load.
Request the classification for the exact model and variant, together with the current instructions and supporting documentation. A plastic enclosure, a product photograph or a description saying isolated does not establish that construction. Keep supply, wiring, mounting and installation decisions tied to the manufacturer's instructions and the applicable project requirements.
Read SELV as a system requirement
IEC's SELV definition concerns an electrical system in which the voltage cannot exceed the extra-low-voltage value under normal conditions and single-fault conditions, including earth faults in other electrical circuits. The definition therefore reaches beyond one voltage printed on a power-supply label.
Ask how the proposed source and circuit arrangement maintain those conditions, including the documented separation and interfaces to other circuits. Identify connected lighting, controls, connectors and any additional supplies. A low nominal voltage alone cannot answer what happens under a fault or establish the complete system's SELV basis.
Can one LED driver meet more than one description?
The descriptions address different questions, so review each applicable claim separately. Class II equipment does not automatically establish a SELV system; a SELV claim does not by itself establish Class II equipment. Likewise, do not translate a Class 2 output claim into either IEC classification without the relevant evidence.
Electrical compatibility remains a separate check. Match input, constant-current or constant-voltage operation, output range, load, controls and installation conditions. For example, a replacement that carries the requested safety description may still have the wrong output mode or dimming interface for the luminaire.
Build an evidence record that survives a substitution
Use one row per driver model and output in the purchasing schedule. Ask the supplier to return the exact claim, its supporting document and the conditions that affect the proposed application. Keep unresolved fields visible instead of filling them from a similar family model.
When a supplier proposes an alternative, repeat the comparison against the approved baseline. Changes to the output, control interface, enclosure or connected assembly may require further review. UL 1310's published scope specifically excludes the power unit's effects on connected equipment or systems and notes that particular end uses may have additional requirements.
| RFQ field | Request from the supplier |
|---|---|
| Identity | Manufacturer, exact model, suffix, revision and label image |
| Application | Destination market, intended use and installation conditions |
| Electrical match | Input, output mode/range, each output, load and controls |
| Claim and scope | Class 2, Class II or SELV wording, applicable standard and covered configuration |
| Evidence | Current instructions and relevant report, listing or evaluation references |
| Approval | Deviations, remaining system checks and named technical approver |
What should you send Lumseq?
Send the destination market, application, lighting model and quantity, supply, required output, controls and installation conditions. Include the exact classification wording in the project specification, existing labels or documents, and any proposed replacement. Ask for the identified driver option, supporting evidence and open items to be returned together.
This gives procurement and technical reviewers a common decision record: what the driver must supply, which protective claim is required, what supports that claim and what remains to be checked in the final assembly.
Frequently asked questions
Questions buyers ask
Are Class 2 and Class II the same LED driver classification?
No. Class 2 concerns an output-circuit classification in the North American context. IEC Class II describes equipment whose basic and fault protection are provided by double or reinforced insulation.
Does a low-voltage LED driver automatically establish SELV?
No. SELV concerns the system's voltage under normal and single-fault conditions, including earth faults in other circuits. Review the source, connected circuit arrangement and supporting evidence.
Does Class II mean the output is automatically SELV?
No. Class II addresses the equipment's protective insulation. SELV addresses a system condition. Obtain evidence for each claim required by the project.
Must every Class 2 LED driver be evaluated only to UL 1310?
Do not assume that. UL 1310 covers defined Class 2 power units, while other standards and end-product requirements may apply. Verify the exact driver, output, intended use and evaluation scope.
Sources and references
UL Standards & Engagement: UL 1310, Class 2 Power Units, Edition 7, public scopeIEC Electropedia IEV 195-06-36: class II equipmentIEC Electropedia IEV 195-06-28: SELV systemUL Solutions: Updates to LED Equipment for Use in Lighting Products - UL 8750: What you need to know (May 4, 2020)Talk to the product team
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