UL 33 PDF
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UL Standard for Safety Heat Responsive Links for Fire-Protection Service – Ninth Edition; Reprint with revisions through and including OCTOBER 31, 2022
1 Scope
1.1 These requirements cover heat responsive links used for fire-protection service. These links consist of devices intended for installation under load conditions such as for use with automatic fire suppression systems; or automatic closure devices for doors, windows, dampers or smoke relief vents.
1.2 Heat responsive links are categorized by temperature rating, type of coating or plating, minimum and maximum design load, and other factors which may have a bearing on their intended use.
Summary of Topics
This revision of ANSI/CAN/UL/ULC 33 dated October 31, 2022 includes editorial changes and the Tolerance for Operating Temperature Bath Test, 9.1, 10.1, 10.4 and Figure 11.1
| Edition | 9 |
|---|---|
| Published Date | June 21, 2021 |
| Last Revision | October 31, 2022 |
| Language | English |
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