On 9/3/19 4:57 PM, Dick's wrote:
Julio-
I was more concerned with routing the conductors from each leg of the tower to the
first ring of ground rods. I used 2” wide copper ribbons with a slow arc down
to each rod. From each of the 3 rods I then branched out the required distance to
other rods using stranded 2 awg copper and cad-welding them at each rod.
There's no particular electrical advantage to ribbon over suitable round
conductors, if that's more convenient. Some find that clamping the
ribbon to the round tower leg is easier with a flat ribbon (using
something like a hose clamp), but they make clamps for pipe to round
conductor as well.
You could probably also use a standard crimp on eye lug with a hole
sized to match your tower bolts to your round conductor.
By the way, AWG 2 (or larger) is more for mechanical strength than
electrical properties. The dominant factor driving the voltage rise is
the inductance, and inductance doesn't change much with diameter or
shape of conductor. (AC resistance does.. so if you're using your
lightning ground as a RF ground for top band or something like that..
then you care)
I wrote a monthly newsletter column. If you start with the Sept 2017 issue you
can see the write up on welding and ground rods at
http://n4lnr.org/wp-content/uploads/2017/09/LARC-9-2017C.pdf. You can go
forward or backwards to see the entire tower installation spanning more than a
year.
Dick, K0CAT
Sent from my iPhone
Richard (Dick) Blumenstein
On Sep 3, 2019, at 3:25 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
On 9/3/2019 5:24 AM, Julio Peralta via TowerTalk wrote:
I've read that when using an 8' ground rod , the rods should be separated by
2X the length of the rods or 16'. However unless I missed it I haven't seen
a distance mentioned for the first rods from the base.
If the tower base is a Ufer ground, 8-16 ft is a good spacing for the first
rods. If the base is not Ufer, I'd go for 8 ft. Either way, one to each leg.
73, Jim K9YC
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