Backup Power Solutions for:
Emergency Lighting Applications
UL 924 Emergency
Lighting UPS
Underwriter’s Lab 924 standard has long applied to emergency lighting and power equipment,
intended for connection to branch circuits of 600 volts or less. Such equipment shall automatically
supply illumination or power or both to critical areas and equipment in the event of failure of the
normal electrical supply, in accordance with Article 700 or 701 of the National Electrical Code, NFPA
70, the Life Safety Code, NFPA 101, the Fire Code, NFPA 1, the International Building Code, IBC, and the
International Fire Code, IFC.
Compliant building lighting must provide at least 90 minutes (UL924) of battery powered illumination,
even under extreme conditions such as electrical surges and full loads, to ensure building occupants
are provided time to evacuate. Emergency lighting shall engage automatically and immediately after a
primary power failure. In applications with an appropriate utility backup, such as a generator, UL924A
may qualify and shorten the UPS/inverter battery time to 30 minutes or less.
It should be noted that UL924 and UL924A are nationwide standards and that differing state/local codes
have jurisdiction.
UL924 Compliant Liebert UPS Systems
Emerson offers numerous alternatives to address almost any facility’s back-up power needs. Below are the Liebert UL compliant
UPS systems for emergency lighting and power. Please refer to the appropriate UPS information page for details.
UPS Product Name
Phase
Compliant Capacity
Output Voltage
UL Standards
Liebert® eXM™
Three Phase
10 – 60 kVA/kW
208V/120V
UL924
UL924A
UL1778
Liebert APM™
Three Phase
15 – 60 kVA/kW
208V/12 0V
UL924
UL1778
Liebert NX™
Three Phase
40 – 120 kVA/kW
480V/277V
UL924
UL1778
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Contact@EmersonNetworkPower.com
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While every precaution has been taken to ensure accuracy and completeness in this literature, Liebert Corporation assumes no responsibility, and disclaims all liability for damages
resulting from use of this information or for any errors or omissions. © 2015 Liebert Corporation. All rights reserved throughout the world. Specifications subject to change without
notice. Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co. ©2015 Emerson Electric Co. All names and logos
referred to herein are trade names, trademarks or registered trademarks of their respective owners. ® Liebert is a registered trademark of the Liebert Corporation.
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