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Old 06-19-2017, 12:53 PM   #1
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Default A real world dissimilar metal issue

Here is the grounding in an older house. You can see the original armored GEC and then the newer #2 aluminum GEC that someone later added.

Notice how it's completely cut at the top where it once touched the armored cable, as well as everywhere else it touched. The pieces were just lying on the floor.


A real world dissimilar metal issue-img_0529.jpg
A real world dissimilar metal issue-img_0530.jpg
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Old 06-19-2017, 01:10 PM   #2
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Isn't that special?
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Old 06-19-2017, 01:12 PM   #3
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Isn't that special?
You want a smack?
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Old 06-19-2017, 04:17 PM   #4
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Sound like one of those handyman specials due most handymans do not really think too much with alum conductors like that and they should be outlawed of bare alum conductors like that.,,

I rather just run copper GEC and be done with it.
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Old 06-19-2017, 05:27 PM   #5
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I once used two of these on a copper water pipe during a service upgrade.
http://www.panduit.com/heiler/Catalo...uct%20Page.pdf
When the counter guy gave them to me I said I want the bronzed ones, not this junk.
He said, "We're out of those, but these are rated for copper or aluminum."

Sure enough, they were stamped CU/AL, so reluctantly, I used them.

When I went back six months later to wire the central air they installed, (reason for the upgrade), they were rotted right off.
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Old 06-19-2017, 05:29 PM   #6
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I once used two of these on a copper water pipe during a service upgrade.
http://www.panduit.com/heiler/Catalo...uct%20Page.pdf
When the counter guy gave them to me I said I want the bronzed ones, not this junk.
He said, "We're out of those, but these are rated for copper or aluminum."

Sure enough, they were stamped CU/AL, so reluctantly, I used them.

When I went back six months later to wire the central air they installed, (reason for the upgrade), they were rotted right off.
You're kidding? I have used the expensive aluminum ones. Why did they rot off, what happened to them?

The aluminum in my picture disintegrated from touching steel.
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Old 06-19-2017, 05:51 PM   #7
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You're kidding? I have used the expensive aluminum ones. Why did they rot off, what happened to them?

The aluminum in my picture disintegrated from touching steel.
I don't really know. It was the first and last time I ever used them.

I always used the brass/bronze ones and never saw it before, anywhere, my jobs or elsewhere.
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