Shaun:
First, Welcome to ECN Forums from one of the 'Jersey Guys'!
Secondly, in order for the members here to help you, re-post your questions with more details.
Something like this......
480 volt transformer, single or three phase??
Primary voltage is 480 volts
Secondary voltage is 120/240 (nominal voltage) single or three phase??
Your secondary voltages are....(phase to phase) and (phase to neutral)??
Try that please
