At 09:56 AM 1/4/2007, Scott Honaker wrote:
>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
I would assume you could contact the VEC folks building the question pools.
And, of course, my original comment was that the 2005 NEC (the
latest.. it comes out every 3 years) doesn't say anything (at least
in the obvious places) about methods for grounding towers.
Maybe it's in some other recommendation, or in a proposed revision
for the 08 code?
>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.
TowerTalk mailing list