Century Plasma cutter.. what size fuse?

Hey guys,
I just picked up a used Century 20/40A plasma cutter. it's 208/230V. I can't find any specs on this thing anywhere.. I hvae the wiring
diagrams. but it doesn't say what size fuse/breaker to use. Any Idea's?        
Also, should it be wired as 208V or 230V?
I have 220V going to the garage for my compressor. it goes to a switch then to the compressor. I'm going to add a twist-lock receptical after the switch and add cord ends to the compressor and plasma cutter. (I don't have any extra circuits to use unless I upgrade the servise) My compressor is 220V/20A. The Plasma cutter can be set to 208V or 230V by changing the wires inside the unit. so that's not a problem. but if I need anyting over 20A for the plasma cutter, I'll need to put the right fuses at the panel for the plasma cutter and somehow bring the compressor back does to 20A.
Any ideas?
Thanx
Dan
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208 is three-phase voltage, and probably not what you're after. If it was me, I'd make sure the machine was wired for 230V, and put it on a 40-amp circuit. (If, in fact, that's what the machine is rated for at 230V.)
That will require wiring of sufficient size -- you probably can't just change the breaker at the panel without upgrading the conductors. If you have any doubts at all, consult a licensed electrician. (I am one, but chances are I don't live in your neighborhood.)
Also, when you get running, clean, dry air is the only thing to run through a plasma cutter. Invest in a Motor-Guard filter array (available from HTP) to keep your machine in good shape, get maximum life from consumables, and get the best cut results.
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