The current (some say "dumbed down") Technician class question pool has a
question on tower grounding. There's no reference given (I would like to
T0B11 (C) What is considered to be an adequate ground for a tower?
C. Separate 8 foot long ground rods for each tower leg, bonded to
the tower and each other
[mailto:firstname.lastname@example.org] On Behalf Of Jim Lux
Sent: Thursday, January 04, 2007 7:11 AM
To: email@example.com; Richard W. Solomon; firstname.lastname@example.org
Subject: Re: [TowerTalk] Antenna/Tower Grounding (Lightning Protection)
At 08:52 PM 1/3/2007, email@example.com wrote:
> Below are some nuggets of wisdom I've gathered from reading
> the postings on this reflector over the years.
>1. You cannot protect the tower, antennas and rigs from a direct
>lightning strike. You can only attempt to minimize the damage if
>2. Your tower ought to have at least one ground wire, minimum of
>#8 gauge wire, to one ground rod within two feet of each tower
>leg. The latest version of the National Electrical Code mandates
>two ground rods and two wires at each leg.
Really? Which code? The 2005 NEC is silent on towers, per se. Art
810.15 says masts and metal structures shall be grounded in
accordance with 810.21. 810.21 just has the stuff about the size of
the wire, straight line runs, protection of the connections, and what
can serve as a grounding electrode.
Art 820 (CATV etc) has very similar provisions.
Maybe you're thinking of some lightning protection code? Or a
recommendation of a manufacturer?
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