Yes, of course. And that would probably mean your relay box wouldn't need to be
listed or stamped or whatever. Depending on what the AHJ is worried about.
Realistically exceedingly few hams build and install NEC compliant antenna
systems. Or, at least, that they get them formally inspected from a NEC
standpoint - typically the building inspector is concerned more about civil
engineering/structural/geotechnical issues. Which is why it's important to
understand why Martin is looking for a listed Antenna Discharge Unit.
Even at businesses (e.g. at work at JPL) I don't recall the building safety
folks spending a lot of time on it, at least as far as NEC 810, 820 issues. RF
exposure - yes; structural (more "if it falls down, will it hit anything
important"). And, of course, out of self interest, we want proper grounding and
such, but nobody has come through looking for whether our hardware is listed or
not.
On Fri, 13 Jun 2025 16:28:29 +0000, Paul Christensen <pbc.law@outlook.com>
wrote:
>"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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