[Mark Husar]

Couple questions for you;
1. Is the panel a commercial/industrial unit?
2. Is the panel labeled as 480/277? or 120/240/480?
3. Is the panel three phase?
4. If you read the voltage between two legs of the input, what is the voltage?
5. What is the voltage of a single input to ground and to common?

Please, if you cannot answer these questions, hire a good electrician who knows industrial panels. Once you make a mistake, it's to late!!