Stay away from 480V delta!
RC
I assume you are referring to a true 480V delta, not just a 480V wye where you bring the neutral to the main disconnect only. Just be sure you carry a good EGC throughout to serve as a ground fault return path.
I will have to dig up some olde references I have for details.
But, unless you have a good ground detector system and maintain the system by clearing the first ground, the second will cause voltage spikes through the system and wrecking havoc.
RC