[TowerTalk] Tower grounding

[K8RI]

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
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk