UL 521

Fire Detection Thermostats / Heat Detectors for Fire Protective Signaling Systems

Org/Number ID	UL 521
Alternate Organization ID / number	ANSI Z220.1 ANSI/UL
Version(s)	1971; 1987
Bin #	0399
Comments
Status	Present
Record last updated	June 11, 2022, 10:54 pm

This is not the most recent edition of this standard.

Newer edition note: 2010