1.1 These requirements cover protectors for paired-conductor communications circuits to be used in accordance with Article 800 of the National Electrical Code, NFPA 70.

Text that has been changed in any manner or impacted by UL’s electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Proposal(s) on …

Lightning protective devices for the protection of secondary distribution wiring systems and equipment. Antenna discharge units for radio- and television-receiving appliances. Lightning conductor and air …

UL 497 – Protectors for Paired Conductor Communication Circuits Please note: All interim revisions for this edition available at time of your purchase will be included.

Apr 25, 2001 · This revision of ANSI/UL 497 dated July 25, 2022 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS). No …

Text that has been changed in any manner or impacted by UL’s electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Proposal(s) on …

This revision of ANSI/UL 497 dated July 25, 2022 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS).