[TowerTalk] Tower grounding

[David Gilbert]

I thought it was pretty clear I was referring to simple moisture 
corrosion.  I guess not.

In any case, I have yet to hear of any instance where a copper ground 
wire (like those that run from your utility panel down through the soil 
to the Ufer ground in the footing of your house, or those that run from 
your tower to the ground rods) had corroded to the point of being 
ineffective.

Dave   AB7E




On 7/17/2013 7:24 PM, K8RI wrote:
> On 7/17/2013 9:26 PM, David Gilbert wrote:
>>
>> Why is that a "reasonable extrapolation"?  Copper wire won't corrode,
>> and rust/corrosion is the ONLY reason that codes require rebar to be
>> fully embedded in the concrete.  Please explain ...
>
> Copper does corrode, it just doesn't normally react to water or air.  
> It will oxidize, it will react with sulfur compounds, and chlorides.
>
> It does stand up better than iron in most conditions.
> If your soil is acetic (marsh, bog, or peat) it will react on the 
> surface, sometimes forming a diode.  My chemistry is 30 years behind 
> me so I don't remember if alkaline conditions bother it, but I don't 
> think so.
>
> 73
>
> Roger (K8RI)
>
>>
>> Dave   AB7E
>>
>>
>>
>>
>> On 7/17/2013 12:52 PM, Grant Saviers wrote:
>>> Building codes now REQUIRE Ufer grounds in many jurisdictions for new
>>> foundations.  Codes also REQUIRE that rebar be covered with concrete,
>>> usually a minimum of 3" to prevent corrosion ingress along the rods.
>>> So it is reasonable to extrapolate that ground wires connected to the
>>> rebar should not exit the concrete below grade ... <snip>
>>>
>>> Grant KZ1W
>>
>>
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