[TowerTalk] [Bulk] Re: Tower grounding connections and foundation

[Jim Lux]

On 8/8/15 7:31 AM, Grant Saviers wrote:
> Re TIA-222-G:
>
> I would like to be enlightened why  #00 wire is needed to attach to two
> ground rods which are likely several ohms resistance to the "remote
> earth"?  Especially when #6 was ok in the last rev of the standard and
> when from an I^2*R and fusing current it would do the job.
>


I think the use of  #00 is usually for mechanical reasons, not electrical.


> Further, it is a bit of a mystery why Ufer grounding is not included
> when it is the NEC & military standard for structures containing
> munitions, explosives, etc.  This forum has opined extensively about why
> Ufer's beat ground rods.

Sometimes it's interesting to see the minutes from the standards 
committee meetings.

That sometimes gives some background for the changes.




>
> Is there any science and engineering behind the new rev G requirements
> and documented failures of towers installed to the old standard?
>
> Or is this "standards polishing" by parties with a beneficial interest?
> I've been there, seen it happen.