4/3 aluminum main

[racnmni]

I have a question regarding 4/3 aluminum wire. My barn, has a 60 amp panel, that is currently being fed by a 12/3 direct bury wire (I know, and the guy I bought the house from was an electrician!) My question is, what kind of load can a 4/3 aluminum wire carry? It's about a 100' run from the main panel. The 4/3 is already run, but not connected. I know copper is the better choice, but that's a big expense and the aluminum is already there... Should I hook it up, or start over?

I should say, the barn is actually my shop. I have a 220 compressor, and a welder out there, so I want to get it right for sure.

 

[rockwithjason]

I would have to look to be sure but I think you will need 4/4 as a minimum. Somebody will chime in here and give us the low down on that. The ampacity will be on the order of 65a, again I need to verify that but it's in the ball park

 

[Charles (in GA)]

Yes, you need four wires. Three hasn't been code in many years. In addition you need two ground rods at the detached building, at least 6 ft apart.

 

[wyliesdiesels]

Can u post some pics?

Im guessing u have SEU which shouldnt be run underground...

 

[racnmni]

I'll get some pics up ASAP. Thanks guys!

 

[pattenp]

#4 Al is good for 65A.