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The building is likely to have a 480/277 3 phase system. It is easily done w/ a transformer to get the 120/208 for wall outlets etc.

If you want it done correctly, safely, and up to code, hire a professional. It takes 8000 hours and usually a state licensing exam to be a commercial electrician. It not just a union racket. The National Electric Code for 2008 is over 650 pages long.

This is not just installing a new outlet in your house. Depending on your building you could have a 480 3-phase system with 400 Amps at the service. The branch circuits alone for your wall outlets are 120V at 15-20 Amps. As was previously pointed out is only takes 20 Milliamps across your heart to kill you, nevermind the fire danger.

Breakers and fuses have to be sized, wire needs to be sized, equipment has to be correct and listed for the application to prevent fires and personnel hazards.

In short, hire a pro, prevent the possiblity of damage and injury.

Micah