Transformer Sizing

[ebmclean]

I have a 480V three phase source that I need to transform to 120 volts for lighting load. What size transformer do I need to order in order to provide 50 amp service?

 

[sparkyboys]

why not just get multi-tap lighting and forget the transformer

 

[hurk27]

not realy enough info but 50 amp's is 12kva @ 120/240 single phase, and 18012 va @ 120/208 3 phase, I would select a transformer with a little head room over these figures.