UL 2684 PDF

1 Scope

1.1 This Standard sets forth requirements for video and thermal image fire detectors and accessories for non-dwelling units, including mechanical guards to be employed in indoor locations (for video and thermal) and outdoor (for thermal) in accordance with the following:

1. a) In the United States:
   1. 1) National Fire Alarm and Signaling Code, NFPA 72;
   2. 2) National Electrical Code, NFPA 70.
2. b) In Canada:
   1. 1) Standard for the Installation of Fire Alarm Systems, ULCS-S524;
   2. 2) National Building Code of Canada; and
   3. 3) National Fire Code of Canada.

1.2 A detector as covered by this standard consists of an assembly of electrical and mechanical components to sense:

1. a) Smoke in the visible and/or infrared wavelengths; and/or
2. b) Flame in the visible and/or infrared wavelengths; and/or
3. c) Heat in the infrared wavelengths.

The heat, smoke, and flame are sensed using a focal plane array (imager). The detector includes provision for the connection to a source of power, signaling, and optional remote-control circuits. Additional functionality is permitted to be incorporated as part of the detector assembly.

1.3 This standard covers detectors intended for open area protection and for connection to a compatible power supply or control unit for operation as part of a fire alarm system.

1.4 This standard does not cover the following:

1. a) In the United States (1) – (7):
   1. 1) Single pixel/integrating (non-imaging) flame detectors;
   2. 2) Wildfire detectors;
   3. 3) Control units to which the detectors are intended to be connected that are covered by the Standard for Control Units and Accessories for Fire Alarm Systems, UL 864;
   4. 4) Self-contained single and multiple station smoke alarms, not intended for connection to a system control unit, that are covered by the Standard for Smoke Alarms, UL 217;
   5. 5) A gas and vapor detector or sensor incorporated as a part of a smoke detector assembly, and covered by the Standard for Gas and Vapor Detectors and Sensors, UL 2075;
   6. 6) Commercial-residential detectors not intended for connection to a system control unit that are covered by the Standard for Smoke Detector Monitors and Accessories for Individual Living Units of Multifamily Residences and Hotel/Motel Rooms, UL 1730;
   7. 7) Detectors for monitoring the smoke density within flues or stacks.
2. b) In Canada (1 – 6):
   1. 1) Single pixel/integrating (non-imaging) flame detectors;
   2. 2) Wildfire detectors;
   3. 3) Control units that are covered by the Standard for Control Units and Accessories for Fire Alarm Systems, ULC 527;
   4. 4) Self-contained single and multiple station smoke alarms that are covered by the Standard For Smoke Alarms, ULC-S531;
   5. 5) A heat detector incorporated as a part of a smoke detector assembly, and covered by the Standard For Heat Actuated Fire Detectors for Fire Alarm Systems, ULC-S530 and/or when part of a multi-criteria smoke detector;
   6. 6) Detectors for monitoring the smoke density within flues or stacks.

1.5 These requirements also cover all remote accessories that are intended to be connected to a detector.

Summary of Topics

This revision of ANSI/CAN/UL 2684 dated August 22, 2025 includes Stability Test Correction, 34.4.