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UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems

Abbreviation
UL 521:1999
Valid from
19/02/1999

Information provider
IHS Markit
Author
Underwriters Laboratories
Information type
Other Standard
Format
Hard copy


Description

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.

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.

For assistance with locating previous versions, please contact the information provider.
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For assistance with locating previous versions, please contact the information provider.
This resource is cited by:

UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems

This document is CITED BY:

UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems

Description

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.

View on Information Provider website
UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems
Description

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.

View on Information Provider website
This resource does not cite any other resources.

UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems

This resource does not CITE any other resources.
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