UL-521 › Standard for Heat Detectors for Fire Protective Signaling Systems
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
CHANGE 07/19 - July 1, 2019
CHANGE 11/20 - Nov. 18, 2020
CHANGE 03/21 - March 24, 2021
CHANGE 07/22 - July 26, 2022
CHANGE 02/23 - Feb. 28, 2023
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
CHANGE 07/19 - July 1, 2019
CHANGE 11/20 - Nov. 18, 2020
CHANGE 03/21 - March 24, 2021
CHANGE 07/22 - July 26, 2022
CHANGE 02/23 - Feb. 28, 2023
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Document Number
UL-521
Revision Level
7TH EDITION
Status
Current
Publication Date
Feb. 19, 1999
Page Count
80 pages