UL 33:2010 free download

UL 33:2010 free download Heat Responsive Links for Fire- Protection Service
1 Scope
1.1 These requirements cover heat responsive links used for fire-protection service. These links consistof devices intended for installation under load conditions such as for use with automatic fire suppressionsystems; 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 andmaximum design load, and other factors which may have a bearing on their intended use.
2 Units of Measurement
2.1 Values stated without parentheses are the requirement.Values in parentheses are explanatory orapproximate information.
3 Components
3.1 Except as indicated in 3.2, a component of a product covered by this standard shall comply with therequirements for that component.
3.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
b) ls superseded by a requirement in this standard.
3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
3.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions,such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.
4 Undated References
4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.
5 Glossary
5.1 For the purpose of this standard, the following definitions describe various types of heat responsivelinks.
5.2 BI-METALLIC TYPE – Two different metals mechanically fastened together.Each metal hasdifferent expansion characteristics which act to release a load when exposed to sufficient heat. Thistype of device may be resettable.
5.3 FUSIBLE TYPE -Two or more metallic parts having a solder element that fuses to release a loadwhen exposed to sufficient heat.
5.4 GLASS BULB TYPE – Liquid-filled glass bulb that fractures to release a load when exposed tosufficient heat.
5.5 HEAT RESPONSIVE LINK – A device that includes a heat responsive element and other featuresthat allow for the application of external installation loads.
5.6 QUICK RESPONSE TYPE – A heat responsive link that complies with the applicable requirementsfor such links as specified in Sensitivity – Oven Heat Test, Section 11.
cONSTRUCTION
6 Temperature Ratings
6.1 A heat responsive link shall be constructed for service where the maximum normal ambient airtemperature at the point of installation does not exceed that specified in Table 6.1.
6.2 A heat responsive link shall have one of the temperature ratings specified in Table 6.1.