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As far as I can tell it is terminated on one 20 amp breaker... at least that is what it looks like.................

I was pulling the 10-2 al which has/was pulled from the receptacle which terminates the 10-3 Al. I shut the breaker down which powers both size wires, proceeded to pull out the 10-2 and sparked...

Thank you for all the responses.

I am in the process of replacing the Al with Cu that was the basis behind the original post. Just wasn't sure about the wire size necessary.

Here is another...

The 10-3 Al feeds a plug the washer and or dryer plugs into off a 20amp circuit. Then a 10-2 Al feeds off that plug into another one which the washer/dryer can plug into (about a 3 foot stretch)....

In the process of replacing aluminum wire in house, came across 10-2 Al need to know if 12-2 copper will work to switch it out with. Also have a hugh black wrapped Al wire supplying the washer and...