Feeding Multi-Section Office Trailer

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sasorikage

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San Bdno
I apologize in advance for asking this, I have never had to deal with this. I am being asked to feed a three section office trailer. Each section has a 120/208v three phase panel with a 125A main. Currently each panel is fed by SO going to a generator. The issue is they
want me to use if possible available surplus transformers and materials. I have available two 75KVA 480-208v transformers and I am not sure if I can legally do this, example use one for two sections providing I use separate disconnecting means and use the second for the third section. I need some advice on this, or is it easier to just get a 112.5 kva to cover all. Thank you for any assistance.
 
What you are suggesting seems fine to me. And you don't need separate disconnecting means. The 125 amp main breaker in each panel will serve as each trailer's disconnecting means. Just size each of the three feeders for a minimum of 125 amps.

Welcome to the forum.
 
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