UL-521 Standard for Heat Detectors for Fire Protective Signaling Systems

UL-521 - 7TH EDITION - CURRENT
Show Complete Document History

Included in this current edition are the following subparts:

 7TH EDITION - Feb. 19, 1999
 CHANGE 10/02 - Oct. 3, 2002
 CHANGE 10/04 - Oct. 22, 2004
 CHANGE 07/05 - July 20, 2005
 CHANGE 01/10 - Jan. 29, 2010
 CHANGE 05/10 - May 19, 2010
 CHANGE 04/15 - April 9, 2015
 CHANGE 10/16 - Oct. 12, 2016
 CHANGE 12/17 - Dec. 8, 2017


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Document Number

UL-521

Revision Level

7TH EDITION

Status

Current

Publication Date

Feb. 19, 1999

Page Count

80 pages