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UL 924 Auxiliary Lighting and Power Equipment

by Suzanne Hooley

Emergency Lighting

Throughout some of our centralized emergency lighting inverter content (webpages, brochures, specifications, whitepapers, and owner’s manuals), you’ll notice that we refer to a standard called “UL 924 Auxiliary Lighting and Power Equipment”.   Perhaps you’re wondering, “what’s that, and how does it differ from the general UL 924 standard that I’m familiar with?”

All of our lighting inverters’ UL 924 listing certifies our products as “Emergency Lighting Equipment”, and assures that our inverters comply with the NFPA 101 and NFPA 111 life safety egress illumination code requirements — for a period of 90 minutes.

However, with additional UL certification, our inverters are also listed as “UL 924 Auxiliary Lighting and Power Equipment”, which allows alternative battery runtimes to be used.   These inverters’ full load battery runtimes can be configured for as few as 15 minutes, and up to 4 hours … while still including all the self-testing and data-logging features required by NFPA.

The important fact to remember, is that when using a centralized battery backup system for emergency egress lighting, the inverter must have the proper UL listing(s) per local lighting codes.

Per the illustration below, each of our  “UltraLITE Models ELC and ELU” and our “eLITE Models ELN and ELE”  inverters provide the perfect complement to generator-based emergency egress lighting:

Typically, power to the emergency panel is supplied by the utility or generator via a transfer switch, and then the inverter is fed from the emergency panel.

When a utility power outage occurs, a break in power and a generator synchronization delay (up to 10 seconds) will exist at the emergency power panel.   However, our emergency lighting inverter uses its internal battery to maintain power to critical “always on” lighting fixtures, without interruption … thus eliminating the generator synchronization delay.   Once generator power is available, the inverter transfers from battery to the generator power source, again without interrupting power to the emergency lights.

There are many public spaces, paths of egress, and critical care areas where up to 10 seconds of darkness is simply unacceptable.
These are areas where physical injury (or worse) could easily result, unless emergency lighting remains “on” — without interruption — during a power outage.

Installing a “UL 924 Auxiliary Lighting and Power Equipment” listed emergency lighting inverter to work with your generator, leaves nothing to chance!!

 Contact us to discuss this solution for your facility!

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