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I really appreciate the help. Thanks a lot guys. I'm just an aspiring Electrical Engineer who is an Electrical Apprentice. I'm going to school for Electrical Engineering and working as an Electrical...

Yes that was a typo. I meant 480v. I'm actually just inquiring... I'm curious. I have never worked with more than 220V. You see I know you get 208 with just 2 phases. And I'm not sure but I believe...

How is that you get 408V? Can you get 408v on a 3 phase panel? And how?

My question is... how do I figure out what size wire to use when I know the Amperage of the electrical device. Is there some form of electrical calculation?

For example I want to upgrade to a 200...