These requirements cover smoke detectors intended to be employed in indoor locations in accordance with the National Fire Alarm Code, NFPA 72. These requirements also cover mechanical guards used to provide physical protection to installed smoke detectors. A smoke detector, as covered by these 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. These requirements cover the following types of detectors: a) 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. b) Detectors intended solely for control of releasing devices such as electromagnetic door holders, fire dampers or smoke dampers. c) Detectors intended for both the applications described in (a) and (b) above. This standard does not cover the following: a) Control units to which the detectors are intended to be connected that are covered by the Standard for Control Units for Fire-Protective Signaling Systems, UL 864. b) Self-contained single and multiple station smoke detectors, not intended for connection to a system control unit, that are covered by the Standard for Single and Multiple Station Smoke Alarms, UL 217. c) A heat detector incorporated as a part of a smoke detector assembly, and covered by the Standard for Heat Detectors for Fire Protective Signaling Systems, UL 521; except for the requirements of the Fire Test (Heat Detector). d) Fire tests for smoke detectors integral with combination door closers and holders that are covered by the Standard for Door Closers-Holders, With or Without Integral Smoke Detectors, UL 228. e) 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. These requirements also cover all remote accessories that are intended to be connected to a smoke detector. A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined essential to maintain the intended level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific provisions of this standard cannot be judged to comply with this standard. Where identified as appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.
UL 268-2006 history
2021UL 268-2021 UL Standard for Safety Smoke Detectors for Fire Alarm Systems - Section / Paragraph Reference: New 3.19, New 6, Revised 74.1.f Subject: Establish requirements for products (detectors and accessories) that employ in field (user interaction) or automatic fi
2019UL 268 BULLETIN-2019 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (COMMENTS DUE: APRIL 29@ 2019)
2018UL 268 BULLETIN-2018 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (COMMENTS DUE: MAY 18@ 2018)
2017UL 268 BULLETIN-2017 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (COMMENTS DUE: January 29@ 2018)
2016UL 268-2016 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (Seventh Edition)
2015UL 268 BULLETIN-2015 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (COMMENTS DUE: JUNE 1@ 2015)
2014UL 268 CRD-2014 UL Standard for Safety Smoke Detectors for Fire Alarm Systems - Section / Paragraph Reference: New 3.19, New 6, Revised 74.1.f Subject: Establish requirements for products (detectors and accessories) that employ in field (user interaction) or automatic fi
2014UL 268 BULLETIN-2014 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (COMMENTS DUE: AUGUST 25@ 2014)
2013UL 268 BULLETIN-2013 UL Standard for Safety Smoke Detectors for Fire Alarm Systems
2012UL 268 CRD-2012 UL Standard for Safety Smoke Detectors for Fire Alarm Systems - Section / Paragraph Reference: 4.2 (Detector Reliability Prediction) Subject: Wording that was inadvertently omitted (Edition 6: August 14, 2009)
2010UL 268 BULLETIN-2010 UL Standard for Safety Smoke Detectors for Fire Alarm Systems
2009UL 268 BULLETIN-2009 UL Standard for Safety Smoke Detectors for Fire Alarm Signaling Systems
2009UL 268-2009 Smoke detectors for fire alarm systems
2008UL 268 CRD-2008 UL Standard for Safety Smoke Detectors for Fire Alarm Systems - Section / Paragraph Reference: New Section 28.7 Subject: Requirements for aerosol sprays used for functional testing of smoke detectors (Edition 5: September 08@ 2006)
2008UL 268 BULLETIN-2008 UL Standard for Safety Smoke Detectors for Fire Alarm Signaling Systems (COMMENTS DUE: APRIL 29@ 2008)
2007UL 268 BULLETIN-2007 UL Standard for Safety Smoke Detectors for Fire Alarm Signaling Systems
2006UL 268 BULLETIN-2006 UL Standard for Safety Smoke Detectors for Fire Alarm Signaling Systems
2006UL 268-2006 Smoke detectors for fire alarm signaling systems
2005UL 268 BULLETIN-2005 UL Standard for Safety Smoke Detectors for Fire Alarm Signaling Systems