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UL 521 PDF

UL 521 PDF

Name:
UL 521 PDF

Published Date:
02/19/1999

Status:
Active

Description:

Heat Detectors for Fire Protective Signaling Systems

Publisher:
Underwriters Laboratories

Document status:
Active
Format:
Electronic (PDF)
Delivery time:
10 minutes
Delivery time (for Russian version):
200 business days
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Please note: All interim revisions for this edition available at time of your purchase will be included.

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.


Edition : 7th
Published : 02/19/1999

History

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