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UL 521

UL Standard for Heat Detectors for Fire Protective Signaling Systems

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Organization: UL
Publication Date: 19 February 1999
Status: active
Page Count: 78
scope:

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.

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.

Document History

UL 521
February 19, 1999
UL Standard for Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
A description is not available for this item.
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
521
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
February 19, 1999
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
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...
521
December 28, 1993
UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems
A description is not available for this item.

References

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