Longer power cable

[67vw]

Last week I bought a new Sycrowave 200 from the local Miller dealer. After I got it home and setup, I realized that I'm going to need a longer power cable. I originally toyed with the idea of making an extension cord using twist lock connectors. Then I found out that they're well over $100.00 each; way too much $$. So now I'm thinking about just changing the existing power cable. So here is my question. How long of a power cable can I run using 8 gauge, 3 wire? I'd like to run somewhere between 20 - 30 feet. Will the 8 gauge handle that length, or do I need to step up the size of the wire? In case it matters, I installed a 60 amp breaker for the new Sync.

Thanks in advance for any and all suggestions.

(o\_|_/o)