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Standard 521, Edition 7

Standard for Heat Detectors for Fire Protective Signaling Systems

UL Standard
Standard 521, Edition 7 Edition Date: February 19, 1999 ANSI Approved: July 01, 2019 $402.00-$998.00

Revisions and Related Documents

Revisions
Red Line Std. (12)

Date   
July 01, 2019 Redline Revision
December 08, 2017 Redline Revision
October 12, 2016 Redline Revision
April 09, 2015 Revision
May 19, 2010 Revision
January 29, 2010 Revision
July 20, 2005 Revision
October 22, 2004 Revision
October 03, 2002 Revision
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CSDS
Proposals (13)

CSDS Proposal

CSDS Proposals

An electronic document associated with a UL Standard for Safety or Outline of Investigation, and issued by UL to propose:

  • A revision of a single or multiple requirement(s).
  • A complete new edition of an existing Standard or Outline.
  • A new Standard or Outline that has not previously been published.

CSDS Proposals provide access to view the proposal and submit comments within UL's Collaborative Standards Development System (CSDS) appropriately.

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Summary of Topics (SOT)
June 12, 2020 N/A
May 04, 2020 N/A
April 19, 2019 N/A
October 27, 2017 View
July 19, 2017 View
August 26, 2016 View
January 30, 2015 View
August 22, 2014 View
May 01, 2014 View
October 02, 2009 View
August 14, 2009 View
April 16, 2009 View
January 18, 2008 View
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CRD/PAGs (0)

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Other Updates (2)

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Bulletin

Bulletins

These bulletins are not used in CSDS. These are announcement and report type bulletins.

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Summary of Topics (SOT)
July 07, 2010 View
October 19, 2001 N/A
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Referenced Standards (12)

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