Greetings fellow TTers,
Some of you have been following my tower building progress on another thread
(Re: [TowerTalk] new AN-Wireless tower, foundation question). I'm
installing a pad and pier (inverted T) foundation by digging a 9' square
hole and forming a 5x5 pier section and then backfilling over the pad and
around the pier after the forms come off. I figured I bury a horizontal
ground rod all around the pier as I backfilled, not placed directly on the
concrete pad but 2 or 3 feet below the surface. I thought I would make the
ground "rod" out of 3/4" copper pipe and in a complete square about 7' on a
side and run a couple heavy cables (or maybe a couple 3/4" soft copper
tubes) up from the buried square of pipe to the tower.
A recent suggestion was to pour almost the entire 9'x9' hole full of
concrete and just form enough of the pier to put a little dirt over the pad
(the big block of concrete) so grass would grow there. That got me to
wondering... how deep should a horizontal ground rod be placed? I'm sure it
depends somewhat on the soil, but most people don't know the conductivity of
their soil anyway.
Anyone have a number for the depth of a horizontal ground rod? See any
problems with my "ground pipe" idea?
Thanks & 73 - JC, K0HPS
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