UL 924 is the safety standard for Emergency Lighting and Power Equipment. Every legitimate emergency lighting product carries this listing. Here's what it actually certifies, and the gotchas to watch for.
The standard
UL Standard 924 covers Emergency Lighting and Power Equipment. The listing certifies that a product meets the construction, performance, and safety requirements that the National Fire Protection Association (NFPA) Life Safety Code references for emergency egress lighting.
If a product does not carry a UL 924 listing, it cannot legally be specified for emergency lighting in any commercial space governed by NFPA 101 — which is essentially every commercial building in the U.S.
What UL 924 actually tests
- Battery duration: minimum 90 minutes of emergency operation after AC power loss
- Transfer time: emergency lighting must activate within microseconds of AC failure
- Charging system: full recharge within 24 hours after a discharge
- Self-testing: monthly diagnostic capability (where applicable)
- Construction: housing, wiring, thermal protection, fault tolerance
What UL 924 does NOT cover
UL 924 certifies the equipment itself. It does NOT certify that a particular installation provides adequate egress lighting. That's a separate calculation against NFPA 101 footcandle requirements (1 fc average / 0.1 fc minimum along the egress path). Specifiers use photometric .ies files in software like AGi32 or DIALux to prove compliance.
Sage and UL 924
Every Sage product is UL 924 listed. Photometric .ies files are downloadable from each product page for the 11 products where they apply.