R. Kevin Stover wrote:
> And this is why you don't attach copper anything, strap or wire,
> directly to a galvanized (zinc) surface.
> Clamp some stainless sheet to the leg then clamp your strap or wire to
> to the stainless.
>
> Scott MacKenzie wrote:
>
>> One good reason is that copper is anodic to zinc and steel. You will get
>> preferential corrosion of the zinc and eventually of the steel - eventually
>> corroding the steel until it is unable to support its weight. At least that
>> is what I was thinking....
>>
>> Scott, AKA KB0FHP
>>
>>
Yes, and so is stainless steel, and it can be even more anodic depending
on the exact composition. So how do you justify putting stainless steel
next to the zinc?
And while I'm at it, I may as well throw out another unknown that bugs
me. Why is the industry recommended method of connecting lightning rods
to use a rope-lay copper wire. That is twisted such that individual
strands take a dive into the center of the conductor very often. That
is very close to the way braid is made and should have the same high
impedance properties at RF frequencies once the strands obtain a little
corrosion.
Jerry, K4SAV
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