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Standard for Heat Detectors for Fire Protective Signaling Systems

UL CSDS Proposal
Standard 521, Edition 7 Edition Date: October 02, 2009
Summary of Topics b0521_7_20091002_sum.html

Subject 521

Bulletin Dated: October 2, 2009

SUMMARY OF TOPICS

The following topics for the Standard for Heat Detectors for Fire Protective Signaling Systems, UL 521, are being recirculated:

1. Clarification of Test Temperature Requirement Details

Back to Standard 521, Edition 7

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