Karl knows Don Foreman. There are *no* better technical engineering
referances than Don.


"John G" wrote in message
news

"Karl Townsend" remove .NOT to reply
wrote in message
nk.net...
Is there a general rule of thumb for how big a transformer will handle a
certain size motor.

I need to step up 220 volt to 440 volt for a 30 horse motor. Haven't
purchased the motor yet so I don't have any amp specs.

There's a 25 KVA unit on Ebay right now, (114 amps at 220, 57 amps at
440). Big enough?

Karl


This problem is far too complicated and dangerous for off the cuff answers
in a world wide news group.
First it needs a real electrical engineeer on the spot.

But to even offer any choices ,
Where in the world are you?
What style is the motor? 3phase Y 3phase Delta.
What supply do you have? Real 3phase, US scrambled who knows what phase,
etc.
Etc, Etc.
--
John G

Wot's Your Real Problem?