Full load amperage of a 3-phase 7.5 HP motor on 240 v is around 20 - 21
amps. The motor and phase converter should be connected to a 30 amp
breaker, at least. Best to check local "code" and install recommended
breaker.

Bob Swinney

"Greg Deputy" wrote in message
news
I've got a new (to me) lathe coming in. It has a 7.5 hp motor, 3 phase.
I've got a 10hp phase converter for it, and in the process of having a
circuit added. What I dont know, though, is what size circuit should I
have
installed for this? 50 amps? more? Less?

I'm sure this is a basic question, but i'm not an electrician. Thanks for
any info.