UL 347 BULLETIN-2011
UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers

Standard No.

UL 347 BULLETIN-2011

Release Date

2011

Published By

Underwriters Laboratories (UL)

Status

Be replaced 2013-01

Replace By

UL 347 BULLETIN-2013

Latest

UL 347-2022

Scope

Scope and object This standard is applicable to ac contactors with rated voltages of 1 501 to 7 200 V@ and metal-enclosed contactor-based controllers@ control centers@ and other control assemblies and associated equipment with rated voltages of 751 to 7 200 V@ designed for operation at frequencies of 50 or 60 Hz on three-phase systems. These requirements cover equipment intended for use in ordinary (non-hazardous) locations and installed in accordance with the applicable local installation codes and standards (see Annex A@ Item 1). These requirements@ as modified by the applicable national standards for fire pump controllers@ also cover fire pump controllers (see Annex A@ Item 2). This standard also includes requirements for controllers intended for service entrance applications. (See 5.204 and Annex A@ Item 3.) This standard does not cover: a) equipment for use in classified locations as defined in the applicable installation codes or standards; b) components contained in contactors and contactor-based controllers for which individual component standards exist; and c) auxiliary low voltage control assemblies (see Annex A@ Item 4).

UL 347 BULLETIN-2011 history

• 1970 UL 347-2022 High voltage industrial control equipment
• 2020 UL 347-2020 Medium-Voltage AC Contactors, Controllers, and Control Centers
• 2019 UL 347 BULLETIN-2019 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers (COMMENTS DUE: March 27@ 2019)
• 2018 UL 347 BULLETIN-2018 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers
• 2016 UL 347-2016 UL Standard for Safety Medium-Voltage AC Contactors, Controllers, and Control Centers (Sixth Edition)
• 2015 UL 347 BULLETIN-2015 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers (COMMENTS DUE: June 29@ 2015)
• 2014 UL 347 BULLETIN-2014 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers
• 2013 UL 347 BULLETIN-2013 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers (COMMENTS DUE: March 04@ 2013)
• 2011 UL 347 BULLETIN-2011 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers
• 2009 UL 347 BULLETIN-2009 UL Standard for Safety High Voltage Industrial Control Equipment (COMMENTS DUE: June 22@ 2009)
• 2009 UL 347-2009 Medium-voltage AC contactors, controllers, and control centers
• 2008 UL 347 BULLETIN-2008 UL Standard for Safety High Voltage Industrial Control Equipment (COMMENTS DUE: October 21@ 2008)
• 2007 UL 347 BULLETIN-2007 UL Standard for Safety High Voltage Industrial Control Equipment
• 2005 UL 347 BULLETINS-2005 6/28/2005 (2p)
• 2005 UL 347 BULLETIN-2005 UL Standard for Safety Medium-Voltage AC Contactors@ Controllers@ and Control Centers
• 1993 UL 347-1993 High voltage industrial control equipment