UL 924 2022-12 PDF

Full title and description

St UL 924 2022-12 — Standard for Emergency Lighting and Power Equipment (UL 924), published as a revision (redline) on December 14, 2022. This document contains requirements, revisions and clarifications for the design, construction, performance and marking of emergency lighting, exit signs, battery systems, inverters and related emergency power equipment intended to operate on branch circuits of 600 V or less.

Abstract

UL 924 establishes safety and performance requirements for emergency lighting and power equipment used to provide illumination and power during loss of normal supply, supporting compliance with life-safety and electrical codes (for example NFPA 70/NEC and NFPA 101). The December 14, 2022 revision (redline) updated provisions related to batteries, markings and other technology-driven topics while retaining the standard’s core performance and testing framework.

General information

• Status: Active — Revision (redline) issued December 14, 2022 (part of UL 924, Edition 10 program).
• Publication date: Revision published December 14, 2022 (Edition 10 originally published May 9, 2016; edition history and subsequent revisions available).
• Publisher: Underwriters Laboratories / UL Solutions (UL Standards & Engagement).
• ICS / categories: Classified under protection-against-fire related categories (commonly indexed with ICS 13.220 – Protection against fire).
• Edition / version: Edition 10 (with the December 14, 2022 redline revision).
• Number of pages: The 10th edition/previous downloadable edition is reported at about 159 pages (page count can vary by print/redline package); the December 14, 2022 redline is a revision package rather than a full reprint.

Scope

This standard applies to emergency lighting and power equipment for use in unclassified locations intended for connection to branch circuits of 600 volts or less. It covers equipment intended to automatically supply illumination or power (or both) to critical areas and equipment in the event of failure of the normal supply — including exit signs, emergency luminaires, unit equipment, central station battery banks, inverters, automatic battery charging and control equipment, and emergency lighting control devices. It also describes auxiliary lighting and power equipment that has not been investigated to meet certain performance requirements of codes.

Key topics and requirements

• Performance and testing criteria for exit signs, emergency luminaires, unit equipment, inverters and central battery banks (illumination, duration, reliability and transfer behavior).
• Requirements and guidance for battery systems (including updates to address lithium‑ion battery considerations introduced in the revision process).
• Marking, labeling and documentation changes to clarify intended use, emergency duration and installation requirements.
• Clarifications on emergency lighting control devices, automatic load control relays and system interfaces (including deferral or careful handling of nascent communication-enabled features where the STP judged technology not yet mature for prescriptive rules).
• Referenced normative standards and exclusions (for example coordination with UL 48, UL 1598, UL 1778, NFPA 70 (NEC), NFPA 101 and relevant building and fire codes).

Typical use and users

Primary users include manufacturers of exit signs, emergency luminaires, battery and inverter systems, third-party testing and certification bodies, electrical and life-safety engineers, specifications authors, building code officials and authorities having jurisdiction (AHJs), and facility managers responsible for specifying or maintaining emergency lighting systems.

Related standards

Closely related standards and documents commonly referenced with UL 924 include: UL 48 (Electric Signs), UL 1598 (Luminaires), UL 1778 (Uninterruptible Power Systems), UL 1994 (Luminous Egress Path Marking Systems), UL 1008 (Transfer Switch Equipment), NFPA 70 (NEC), NFPA 101 (Life Safety Code), International Building Code (IBC) and International Fire Code (IFC).

Keywords

UL 924, emergency lighting, exit signs, emergency luminaires, battery banks, inverters, emergency power equipment, redline revision, Underwriters Laboratories, life-safety, NEC, NFPA 101

FAQ

Q: What is this standard?

A: UL 924 is the Underwriters Laboratories Standard for Emergency Lighting and Power Equipment that sets safety, construction, performance, testing and marking requirements for equipment that provides illumination or power during loss of normal supply. The December 14, 2022 item is a redline revision to the Edition 10 standard.

Q: What does it cover?

A: It covers exit signs, emergency luminaires, unit emergency equipment, central battery installations, inverters and associated charging/control equipment and emergency lighting controls intended for use on branch circuits of 600 V or less, together with related marking and installation information. It also identifies equipment or applications covered by other standards.

Q: Who typically uses it?

A: Manufacturers, test laboratories, certifiers, electrical designers, specifiers, code officials, AHJs and facility managers use UL 924 to design, test, certify and inspect emergency lighting and power equipment and systems.

Q: Is it current or superseded?

A: The document series is active. Edition 10 is the controlling edition with periodic revision/redline updates — the December 14, 2022 redline is an official revision to that edition. Users should confirm whether later revisions or redlines have been issued for their purchase or compliance date (UL maintains the edition and revision history).

Q: Is it part of a series?

A: Yes. UL publishes UL 924 as a numbered UL standard (Edition 10 for the major revision cycle referenced here) and it cross-references and is cross‑referenced by other UL standards and outlines (for example UL 48, UL 1598, UL 1778 and related OOIs such as UL 924A). Revisions and redline documents are published between full-edition reprints as needed.

Q: What are the key keywords?

A: Emergency lighting, exit sign, battery, inverter, emergency power, UL 924, redline revision, emergency controls, Underwriters Laboratories, life-safety.