Aluminum wire with copper core?

Originally Posted By: jsmith3
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I have come across wire that looks like solid strand aluminum but when I cut it it has a copper core. what is this? is there any way to identify this during an inspection? or if it looks like SS aluminum, call it SS aluminum?


Jon


Originally Posted By: jbushart
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Copper-clad aluminum has different qualites than aluminum and is not the same.



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Originally Posted By: rcooke
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How old is the wire could it be knob and tube single strand . Not like romex . knob and tube wire was coated with tin to make it easier to solder . all joints where soldered . it also had a rubber covering with coton over it . More info would help .



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Originally Posted By: Greg Fretwell
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A lot of old Romex was tinned. If the center is copper it is copper. If the center is aluminum with copper on the outside it is copper clad.


Originally Posted By: jsmith3
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It is not knob and tube, it is older wire, how can I tell if it is tined copper or solid strand aluminum.


Thanks, Jon


Originally Posted By: rcooke
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jsmith3 wrote:
It is not knob and tube, it is older wire, how can I tell if it is tined copper or solid strand aluminum.

Thanks, Jon

Scratch it with your knife it it shines like a new penny then its copper If it looks drab and silver its aluminum. Alos nick it aluminum breaks easy Copper takes many like 6 or more bends to break. Roy Sr


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Roy Cooke Sr.

http://Royshomeinspection.com

Originally Posted By: phinsperger
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http://www.nachi.org/bbsystem/usrimages/t/tin_plated_copper.jpg




Additional threads about tinned coated copper;
http://www.nachi.org/bbsystem/viewtopic.php?t=3068
http://www.nachi.org/bbsystem/viewtopic.php?t=1888
http://www.nachi.org/bbsystem/viewtopic.php?t=9069


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Originally Posted By: ahalstead
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I came across the same exact thing today … a 1920’s house with some old wire in metal clad sheathing. Very similar looking wire … except i could not take a close look without turning the power off to the house …


Brand spanking new 200 amp service in a house with some old wires to it .. go figure. anyway, I first thought it was aluminum .. upon closer look it had a copper core .. some of the aluminum had turned black (probably from age? No hot spots) which made the copper center even easier to pick out.

Got ready to ask my friends here what i had and whala ...someone beat me to it ..

How can you beat this board? You can't!

Allen


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Allen J. Halstead

Tri-County Home Inspections
Ghent, NY

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Originally Posted By: rcooke
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ahalstead wrote:
I came across the same exact thing today .. a 1920's house with some old wire in metal clad sheathing. Very similar looking wire .. except i could not take a close look without turning the power off to the house ..

Brand spanking new 200 amp service in a house with some old wires to it .. go figure. anyway, I first thought it was aluminum .. upon closer look it had a copper core .. some of the aluminum had turned black (probably from age? No hot spots) which made the copper center even easier to pick out.

Got ready to ask my friends here what i had and whala ...someone beat me to it ..

How can you beat this board? You can't!

Allen

Small correction it is not Aluminum on the wire .
The wire was tinned to make it easier to solder.
When I served my electrical apprenticiship we had an exam on making a 7 strand splice .
I believe it was called a western union.
It looked like a running splice in rope does tapering down to a smooth finish .
to Join a number 6 wire it took about 20 minutes then we had to solder it .
WOW! this question has brought back a lot of memories from the fifties .


--
Roy Cooke Sr.

http://Royshomeinspection.com