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Standard 497B, Edition 4

Standard for Protectors for Data Communications and Fire-Alarm Circuits

UL Bulletin
Standard 497B, Edition 4 Edition Date: November 01, 2007 $203.00-$254.00
Summary of Topics m0497d_1_20071101_sum.html

Subject 497D (497B)

Bulletin Dated: November 1, 2007

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for Component Secondary Protectors for Communications Circuits Used with Specified Voltage Suppression, Subject 497D.

Back to Standard 497B, Edition 4

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