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HackWork 06-19-2017 12:53 PM

A real world dissimilar metal issue
 
2 Attachment(s)
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.


Attachment 107305
Attachment 107313

joebanana 06-19-2017 01:10 PM

Isn't that special?

HackWork 06-19-2017 01:12 PM

Quote:

Originally Posted by joebanana (Post 4042801)
Isn't that special?

You want a smack?

frenchelectrican 06-19-2017 04:17 PM

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.

Signal1 06-19-2017 05:27 PM

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.

HackWork 06-19-2017 05:29 PM

Quote:

Originally Posted by Signal1 (Post 4043617)
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.

Signal1 06-19-2017 05:51 PM

Quote:

Originally Posted by HackWork (Post 4043633)
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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