UL 924 Emergency Lighting Equipment

UL 924 is the safety standard for emergency lighting and power equipment — the listing that tells a specifier, inspector, or electrician that a device will keep an egress path lit when normal power fails. This collection brings together the UL 924 listed hardware that makes a code-compliant emergency lighting system work: automatic load control relays (ALCRs), emergency lighting control devices, transfer devices, UL 924 relay and power packs, and the emergency drivers and inverters that drive fixtures during an outage.

Most general-purpose lighting is switched or dimmed — which means it can't legally serve as emergency lighting on its own. A UL 924 listed emergency lighting control device solves this: when it senses a loss of normal power, it forces the fixtures it controls to full output, overriding any switch, dimmer, or occupancy sensor. That lets everyday fixtures do double duty as emergency lights, so you don't have to install a separate bank of dedicated emergency luminaires.

Under the life-safety codes most jurisdictions enforce (NFPA 101 and the International Building Code), emergency illumination must activate within about 10 seconds of a power loss and provide at least 90 minutes of illumination along the path of egress. UL 924 listing is how manufacturers demonstrate their equipment can meet those obligations, and how inspectors verify it on site.

Rock Lighting stocks UL 924 equipment from the control and emergency brands electrical pros already specify — nLight/Acuity, Wattstopper, and others — so you can match the relay, driver, or control device to the fixtures and voltage you're already running. Not sure which device fits your circuit? Contact our team with your fixture type, voltage, and how the space is switched, and we'll point you to the right UL 924 listed part.

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Frequently Asked Questions

What does UL 924 mean?
UL 924 is the Underwriters Laboratories standard for emergency lighting and power equipment. A UL 924 listing means the device has been tested to perform its emergency function — such as forcing lights to full output or transferring to battery/inverter power — when normal power is lost.
Why do I need a UL 924 emergency lighting control device?
Switched or dimmed fixtures can't serve as emergency lighting on their own, because a device could leave them off during an outage. A UL 924 listed emergency lighting control device overrides the switch or dimmer and forces the connected fixtures to full output when normal power fails, so ordinary fixtures can double as code-compliant emergency lighting.
What is an automatic load control relay (ALCR)?
An automatic load control relay is a UL 924 listed device that connects normal and emergency power to a lighting load. During normal operation it passes through your switching and dimming controls; on loss of normal power it bypasses those controls and drives the fixtures to full brightness for egress illumination.
How long does emergency lighting have to stay on?
Under NFPA 101 (Life Safety Code) and the International Building Code, emergency egress lighting must activate within roughly 10 seconds of a power loss and provide at least 90 minutes of illumination. Confirm the exact requirement with your local code edition and authority having jurisdiction.
Do I need UL 924 equipment for exit signs too?
Exit signs and emergency luminaires are also covered by UL 924. If you need illuminated exit signage, see our Exit Signs collection; this collection focuses on the UL 924 control, relay, and driver equipment that keeps general lighting circuits compliant during an outage.
Which UL 924 device is right for my project?
It depends on your fixture type, line voltage, and how the space is switched (relay pack, wall-box device, or emergency driver/inverter). Send us your fixture and circuit details and our team will match you to the correct UL 924 listed part.