Transformer

[Senorslick]

I need to provide single phase 240V, 125 A to a medical device. Problem is, the only source I have is 3- phase 208V Y.
Suggestions?

 

[busbar]

Using a 5kVA 240V-to-32V buck/boost transformer, a load of 156A @ 236V could be served from a 208V supply. Note that only a 2-wire load could be served, and not a 3-wire (120/240V) load. One application guide is at

http://www.federalpacific.com/IN-7900.pdf

The 236V-circuit voltages to neutral will be significantly unbalanced. NEC Article 450 requirements apply.

 

[busbar]

Note that the load on the 208V circuit will not be balanced. Only two phases will have load current. For a 125A/236V load, the phase current on the 208V side will be ~144A.

There is a variation on the listed single buck/boost transformer configuration that will give closer to 240V on the higher-voltage terminals, but will serve somewhat lower current.

Can you give us some more details on the load equipment?