These requirements cover electric operators for doors@ draperies@ gates@ louvers@ windows and other opening and closing appliances rated 600 V or less to be employed in ordinary locations in accordance with the National Electrical Code@ NFPA 70. These requirements also cover complete doors@ gates@ and other such assemblies that include electric opening and closing appliances. These requirements also cover accessories@ such as external entrapment protection devices@ for use with appliances covered by this standard. Doors and door operators intended for exit use as defined in the Life Safety Code@ NFPA 101 and codes such as the BOCA National Building Code@ the Standard Building Code@ and the Uniform Building Code@ are additionally subject to design requirements specific to such use. These requirements do not address active fire alarm functionality@ which is addressed in NFPA 80.
UL 331 BULLETIN-2008 history
1970UL 331-2020 Strainers for flammable fluids and anhydrous ammonia
2017UL 331 BULLETIN-2017 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (COMMENTS DUE: December 4@ 2017)
2013UL 331 BULLETIN-2013 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (COMMENTS DUE: APRIL 15@ 2013)
2012UL 331 CRD-2012 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia - Section / Paragraph Reference: New 1.4 and New Supplement SA Subject: Strainers for non-potable water (Edition 8: February 25, 2008)
2012UL 331 BULLETIN-2012 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (COMMENTS DUE: June 08@ 2012)
2008UL 331 BULLETIN-2008 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (COMMENTS DUE: FEBRUARY 4@ 2008)
2008UL 331-2008 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (Eighth Edition; Reprint with Revisions Through and Including December 14@ 2017)
2007UL 331 BULLETIN-2007 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia (COMMENTS DUE: December 03@ 2007)
2004UL 331 BULLETIN-2004 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia