[TowerTalk] Lightning

[Roger (K8RI) on TT]

I believe the standard calls for no conductors entering the concrete 
below grade.  Not sure abt VE7.

73, Roger (K8RI)

On 6/29/2017 Thursday 9:22 AM, Jim Thomson wrote:
> What else that can be done is to drive 1-3   x 8 foot cu rods into the ground..at the bottom of the hole,
> before you pour the concrete.  Then cadweld each one...then a short piece of bare  2 ga stranded Cu wire
> from the top of each ground rod to base of tower.    Then the 1-3 rods are  8 ft below the bottom of the
> concrete, which puts them well below the frost line.    I did that on my L+R tower back in the mid 80’s.
> It was 33 inchs across the face, with  20.7 ft long straight sections.    All angle steel, all bolted construction.
> Hole was  6x6x6  square, with re-bar.  Any lightning passes right down the tower, right to bottom of the 6 ft deep
> block of cement...and continues on another 8 ft  down, via the 3 x rods.   Bottom of each rod is then 14 ft below
> ground.   We used an electric jack hammer, with a special end on it, designed to drive ground rods.   I lost 6 ft
> of the 1st  20.7 ft section by placing the tower section into the deep hole.
>
> Jim   VE7RF
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73

Roger (K8RI)


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