UL 521:2021

$78.65

Standard for Heat Detectors for Fire Protective Signaling Systems

Published By	Publication Date	Number of Pages
UL	2021-03-24	78

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Category: UL

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Description

1 Scope

1.1 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.

1.2 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.

1.3 Deleted

Additional information