UL 33
Standard for Heat Responsive Links for Fire-Protection Service

DETAILS
Edition Number:8SCC Approved:--
Edition Date:2010-03-09DOD Approved: 1987-11-18
Price Code:BANSI Approved: 2015-04-13
Type:ulstd

  • SCOPE

    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.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Units of Measurement
          • 3 Components
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 Temperature Ratings
          • 7 Coatings and Platings
        • PERFORMANCE
          • 8 Strength of Heat Responsive Element and Link Assembly Tests
            • 8.1 Fusible-alloy and Bi-metallic Types
            • 8.2 Glass-bulb types
          • 9 Glass-Bulb Thermal Shock Test
          • 10 Operating Temperature (Bath) Test
          • 11 Sensitivity – Oven Heat Test
          • 12 High Temperature Exposure – Test (90-Day) Heat Responsive Links
          • 13 High Temperature Exposure – Test for Wax Coated Heat Responsive Links
          • 14 Evaporation Test for Wax Coatings
          • 15 10-Day Corrosion Test
          • 16 30-Day Corrosion Test
            • 16.1 General
            • 16.2 20 percent salt spray
            • 16.3 Moist hydrogen sulfide air mixture test
            • 16.4 Moist carbon dioxide – sulfur dioxide air mixture test
        • MARKING
          • 17 General
    • APPENDIX A