112.5KVA transformer sizing question

[delfadelfa]

I have an existing GE transformer 9T23B3875 that feeds one 208 volt 3 phase panel with a 225Amp main. I need to tie in a generator which is about 200 feet away for the transformer with a new ATS. The question is what size generator will I need to feed the 112.5KVA transformer and what size conductors to feed the transformer from the generator which is 200 feet away? Thanks

 

[kingpb]

How about a generator that has a 112.5KVA rating at site conditions........

Look in NEC 310.16 for conductor sizes.

What are you trying to do with this set-up?

 

[delfadelfa]

I'm working in a large warehouse and I need to backup only one of the panels with the generator. An over head buss feeds the transformer 3 phase 480v no neutral. l want to take that feed into the ATS and then feed the transformer from the ATS. So I will need to power the 112.5 KVA transformer from the generator when the power fails. The primary on the transformer looks like #1 copper with 4/0 copper on the secondary feeding one 208Volt 225Amp panel. I'm looking for a generator to feed the transformer.