Electrical Feed

[Mike Tracy]

I saw a panel today that has a #2 aluminum wire and the third wire is a #3 copper wire. The white aluminum feed is connected to the ground bar and the #3 copper wire is connected to the main 100 amp breaker. Is this a correct connection?

[Gunnar Alquist]

I saw a panel today that has a #2 aluminum wire and the third wire is a #3 copper wire. The white aluminum feed is connected to the ground bar and the #3 copper wire is connected to the main 100 amp breaker. Is this a correct connection?

Mike,

I think we need more information. I cannot tell much from your post. It doesn't sound right though.

#3 copper wire?
Three wire feed? No equipment ground?
Older panel?
Wire insulation type?
Do you have a picture?