transformer question

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fisherelectric

Senior Member
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Northern Va
I have a friend who owns a drying machine that drys ink on sports jerseys.
This machine stays on all day to keep the ink warm. Its rated at 75 amps at 240 volts 1 phase. It is currently fused at 60 amps and has never blown a fuse because he says turning it up higher will burn the jerseys. He wants to move this machine to a new space that has an existing 100 amp 277/480 volt panel. I think he needs to figure this machine at 125% for continuous use.
I told him 75x1.25=93.75 X 240=22.5KW. So a 25KVA transformer. Feed with 50 amp 480 volt 2 pole breaker. Is this correct?
 
IMO it's not a continuous load. Even if this machine were set to it's maximum setting it likely has a thermostat to regulate that maximum setting. If the machine cycles off for 1 second every three hours it's not a continuous load.
 
Doesn't the new space have a 120/240V or 208Y/120V panel? If not, then you are going to need to provide some addtional 120V power for outlets, and such in that case transformer will need to be sized for other loads as well.

If your going dedicated, then I don't see how you can legit go any smaller than 25KVA, as 15KVA could end up being an issue.
 
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