what'a interesting is that 497 is applied to "communications" line (i.e. phone
lines and data interfaces) so it "kind of" fits. For example, you'd use a UL497
listed device for your rotor control lines.
It's not an "antenna discharge unit" as called out in the NEC 800 articles.
On Sun, 15 Jun 2025 16:49:53 -0400, "Martin A. Flynn" <maflynn@theflynn.org>
wrote:
Jim,
I asked our municipal POC to source a list of protectors that pass the
insurance companies muster, here's a link to what was provided
https://www.polyphaser.com/Themes/polyphaser/Content/assets/pdf/INF-PP-UL497E-Flyer_V3.pdf
We noted this is UL497E and not the UL452 (radio & television receiving
equipment) / UL 1449 (surge suppression) that was originally called out,
and were told this is the only option, and specifically "told not to
press the issue".
73 Martin
W2RWJ
On 6/15/2025 3:58 PM, Jim Lux wrote:
> And, of course, those polyphasers aren’t a listed device. At least not on PP
> website. They may have a version with the test pedigree and all.
>
> Note that the government can waive a host of requirements. I suspect that’s
> what happens with this sort of thing.
>
> On Fri, 13 Jun 2025 19:22:56 -0400, "Martin A. Flynn" wrote:
>
> Appreciate the tips and guidance - here's as much information as I'm
> comfortable posting.
>
> Station is located in a building owned by a unit of government, their
> insurance vendor requires UL452 / UL 1449 listed protectors at the
> entry panel that is common their their radio equipment.
>
> All of the coaxial feed lines (theirs and ours) are protected by
> Polyphasers at the entrance panel
>
> Antenna is a W7FG dipole with ~ 100 feet of 450 ohm ladder line (14
> gauge copper weld) , tuner is at the operating position.
>
> The more I look at this, I'm leaning towards a recommendation of
> scrapping the dipole and going to a 125' long wire and weatherproof /
> outdoor tuner
>
> 73
>
> Martin
>
> W2RWJ
>
>
> On 6/13/2025 6:54 AM, Martin A Flynn wrote:
>> Have a situation where a UL listed protector is required on a ladder line
>> feeder.
>>
>> I’m striking out in my search
>>
>> Any suggestions?
>>
>> 73 Martin
>>
>> W2RWJ
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