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By order of the publisher, historical UL documents are not returnable for any reason. Once you place an order for an historical document, we cannot issue a refund, credit, or exchange of any kind.

These requirement s cover smoke detectors intended to be employed in indoor locations in accordance with the National Fire Alarm Code, NFPA 72.

A smoke detector, as covered by thes e requirements, consists of an assembly of electrical components coupled with a sensing means inside of a chamber, or by separate components, to detect smoke. The detector includes provision for the connection to a source of power, signaling, and remote control circuits. A heat detector, or audible signaling appliance, or both, are not prohibited from being incorporated as part of the smoke detector assembly.

 

Document History

  1. UL 268


    Smoke Detectors for Fire Alarm Systems

    • Most Recent
  2. UL 268


    Smoke Detectors for Fire Alarm Systems

    • Historical Version
  3. UL 268


    Smoke Detectors for Fire Protective Signaling Systems

    • Historical Version
  4. UL 268


    Smoke Detectors for Fire Protective Signaling Systems

    • Historical Version
  5. UL 268

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    Smoke Detectors for Fire Protective Signaling Systems

    • Historical Version