UL 521:2021 PDF Download
Standard EN Sample
Standard for Heat Detectors for Fire Protective Signaling Systems
Also Known As:
SKU122976351
Published by
Underwriters Laboratories Inc.
UL
Publication Date2021-03-24
Pages CountPages78
1 Scope
1.1 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.
1.2 Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices.
1.3 Deleted
Details
| Edition | 7 |
| ICS Codes | 13.320 - Alarm and warning systems |
| Language(s) | English |
| File Size | 942.1 KB |
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