Galvanic corrosion from different metals in contact with any amount of
moisture. Running electricity through the contact makes it worse.
The only way aluminum wiring meets code is with a copper pigtail between it and
any screwed down or push in connection. There are special crimp sleeves and
tools to compress the aluminum and copper very tightly together, breaking the
oxide film on the aluminum wire and sealing out oxygen and moisture so it
doesn't oxidize again.
Most of the aluminum wire in homes got installed during a time when it was a
lot cheaper than copper. Then breaker boxes, plugins and light switches began
to set houses on fire.
From: Dave Cole <[email protected]>
To: [email protected]
Sent: Friday, October 7, 2016 10:09 AM
Subject: Re: [Emc-users] pressure equalizer method around ball nut
Next question; Why do aluminum electrical connections tend to melt down
sometimes?? I've experienced several aluminum wire to terminal
failures... However most of them were made without the mandatory
anti-corrosive paste.
Dave
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