UL 521:7ED 1999-02-19
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Heat Detectors for Fire Protective Signaling Systems
Hardcopy
19-02-1999
11-12-2024
This revision of ANSI/UL 521 dated March 24, 2021 is being issued to incorporate the following changes:
Stability Test Revisions; Section 40 (title), 40.6, Section 40A
Minimum Size for Programmable Heat Detector Symbol; 53.8
| DevelopmentNote |
NEW CHILD REV 10 2021 IS NOW ADDED.
|
| DocumentType |
Standard
|
| Pages |
0
|
| ProductNote |
NEW CHILD REV 10 2021 IS NOW ADDED.
|
| PublisherName |
Underwriters Laboratories
|
| Status |
Superseded
|
| SupersededBy |
These requirements cover heat detectors for fire protective signaling systems intended to be installed in ordinary indoor and outdoor locations in accordance with the Standard for Automatic Fire Detectors, NFPA 72E.
Access your standards online with a subscription
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.
Important note : Users cannot be edited or removed once added to your Multi user PDF.