UL 268 PDF

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.