Obviously you are looking for a way to estimate site unseen for ball-parking a bid or having some idea for sizing something. Just thought I'd say that before you get "You really should size it off the nameplate rating".
I don't know off hand for your example, but I've found for single phase 240 volt, about 10 amps per ton. That's breaker size. 5 ton 50 amp breaker, etc.
