[TowerTalk] Ufer Grounding
David Gilbert
xdavid at cis-broadband.com
Fri Jul 15 21:48:41 EDT 2016
In my case, I cadwelded #4 wire between the legs of my tower base
(embedded in the concrete) and the rebar cage. I'm not saying that I
needed to do that ... only that I see no point at all in buying weldable
rebar if someone wants to cadweld to it.
Dave AB7E
On 7/15/2016 11:14 AM, jimlux wrote:
> On 7/15/16 11:06 AM, David Gilbert wrote:
>>
>> Normal rebar is made from random composition steel melted down from old
>> car chassis, bed springs, washing machine frames, older reclaimed rebar,
>> etc. Welds made to it have completely indeterminate strength.
>>
>> Weldable rebar has controlled content and is spec'd where the rebar
>> joints need to be structurally strong. I think rebar cages for bridge
>> pylons and large building columns might be an example.
>>
>> I don't see any problem cadwelding copper wire to normal rebar since we
>> aren't looking for structural strength anyway. The materials (copper
>> and iron/steel) are inherently different in the first place.
>>
>
> It's unclear why you would feel compelled weld the wire to the rebar
> (inside the concrete) in any case. The Ufer design doesn't require it.
> It's more about getting the appropriate length of metal into the
> concrete.
>
> That said, if you're doing the "piece of rebar sticking up through the
> top" as the connection point, then some sort of welding of your copper
> wire to the rebar at that point would be useful.
>
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