I have the 80 and running on 50 amps single phase is no problem,,,just remember the rule of thumb for plasma's,,the power in will only give you 10 more amps of plasma than the breaker,,,to get 80 amps plasma you need a 70 amp breaker, ,,,for 70 amps of plasma you need a 60 amp breaker and so forth,,Nothing wrong with having a bigger plasma,,,cause some days I may hook it up to the 3phase or maybe just install a 70 amp breaker on the short run welding plug...the welding plug closest to the breaker box ( 3 feet away) has a 60 amp breaker on it,,,so I can pull 70 amps on my PP80
Some of those lies people tell about me, are true