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Standard 1638, Edition 5

Visible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories

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Standard 1638, Edition 5 Edition Date: September 06, 2017
Summary of Topics s1638_5_sum.html

Summary of Topics

The following revisions are being issued for the Fifth Edition of ANSI/UL 1638, the Standard for Visible Signaling Devices for Fire Alarm and Signaling Systems, Including Accessories:

1. Addition of Visual Signal Pulse Width Marking, and Clarifications regarding Abnormal Operation and Burnout Test, and Mechanical Strength Tests for Enclosures

2. Reference Document Changes and Editorial Corrections

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