Not the answer to your question, but in a previous house I ran cable through
the attic and sometimes it interacted with house wiring in the attic,
generating RFI in the TV and stereo. This typically happened when running into
a marginal match at high power.
To avoid this, and to get the best lightning protection, I would bring the
cables all the way down the tower to the ground and bond the shields to the
bottom of the tower. The tower should have a proper ground system consisting of
multiple radials (say, about 50' long) with 8-foot ground rods Cadwelded to the
radials every 16 feet. Then run the cables shallow-buried around the house to
the shack entrance, which should have a bulkhead entrance connected to a
single-point ground consisting of multiple radials and ground rods, same as at
the tower. The tower ground and singe-point ground should be bonded together
with a separate run of buried ground wire, with 8-foot ground rods Cadwelded
every 16 feet.
Yeah, it's a lot of work and expense, but worth it from a safety perspective.
73, Dick WC1M
> -----Original Message-----
> From: John Harper [mailto:firstname.lastname@example.org]
> Sent: Monday, August 20, 2012 7:45 AM
> To: email@example.com
> Subject: [TowerTalk] Attic or outside cable run - safety issues
> regarding lightning?
> >From a safety standpoint (lighning), is there any reason not to run
> through an attic for the length of a house? My new tower is located at
> the opposite end of the house from the shack and I'd prefer to go the
> more direct route through the attic. That would save me 25 feet or cable
> and would look neater. But if there are issues of safety, they'll take
> John Harper AE5X
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