Copper (Was: 10 forgotten wonders of 1980s homes

Paul Koning paulkoning at
Thu Dec 31 14:27:37 CST 2015

> On Dec 31, 2015, at 3:17 PM, Geoffrey Oltmans <oltmansg at> wrote:
> On Thu, Dec 31, 2015 at 1:59 PM, Paul Koning <paulkoning at> wrote:
>> I haven't see aluminum-rated devices in hardware stores in many years.  Be
>> careful: typically they will be labeled either as "copper only" or as
>> "CU/AL".  But that doesn't mean "copper or aluminum" -- it means you're
>> allowed to user copper-clad aluminum.  That's a hack type of wire that was
>> adopted for a while after the plain aluminum was discovered to be a Very
>> Bad Idea.  It's not quite as bad but there is really no justification for
>> its existence, and indeed it is no longer the current practice.
>> Copper-clad aluminum can be used with copper without much trouble, but the
>> wire is thicker and it breaks more easily.
> Hmm... if this is to be believed then you can use these for aluminum
> wiring...
> "CO/ALR switches and outlets are required anywhere aluminum wiring has been
> installed."

It sure sounds like it.  I'm impressed, especially at that price.


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