Verify a generator's UL 2200 listing before installation
domain: ul.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Locate the UL Certification Mark on the generator (UL symbol plus the words CERTIFIED/SAFETY, a geographic identifier, and a file number) rather than relying on a spec-sheet claim.
Confirm the listing covers the complete engine-generator assembly, not just individual UL-recognized components — the two are not the same.
Cross-check the file number/product in UL's Product iQ database (category code FTSR for stationary generators) to confirm the listing is current and matches the model/configuration being installed.
Flag custom or field-modified configurations, since modifications can void the assembly-level UL 2200 listing even if original components were listed.
Retain the listing documentation for the permit/inspection file, since many AHJs require evidence of listing for equipment approval.
Known gotchas
A generator built from 'UL-listed components' is not the same as a UL 2200-listed assembly — verify the complete unit carries its own listing, not just its parts.
Field modifications (non-OEM parts, altered enclosures, added accessories) can invalidate the assembly listing; check with the manufacturer before making changes to a listed unit.
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