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Standard for Heat Detectors for Fire Protective Signaling Systems

UL Standard
Standard 521, Edition 7 Edition Date: February 19, 1999 $402.00-$998.00

Revisions and Related Documents

Revisions (9)

Revision - These documents only contain the revised pages. The Standard document includes all available Revisions.
July 01, 2019
December 08, 2017
October 12, 2016
April 09, 2015
May 19, 2010
January 29, 2010
July 20, 2005
October 22, 2004
October 03, 2002
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CSDS
Proposals (11)

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)
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
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October 02, 2009 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)

Red Line Standards (3)

Red Line Summary of Topics (SOT)
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October 12, 2016 View
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