[TowerTalk] UL listed protector for ladder line

Paul Christensen pbc.law at outlook.com
Fri Jun 13 12:28:29 EDT 2025


>"This is all good stuff, BUT, if he's looking for regulatory compliance, he'd have to get his relay box signed off by someone (either a test lab, or in some jurisdictions, a Professional Engineer)."

I indicated that a suppressor could still be used with vacuum relays -- to your point, if required to satisfy a code provision.  Nothing should prevent the use of vacuum relays together with a UL suppressor if the vacuum relays are positioned on the ladder line, away from the regulated premises.

Paul, W9AC



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