The 6500 series accepts different power supply modules, both AC and/or DC.
The AC power supplies support different wattage, per power supply. Many of those power supplies will accept multiple power lines, also many will take AC power as 110 or 220V. So, depending on the power supply model, its number of power feeds and its voltage, and how much power you want the power supply to be able to provide, will tell you what kind of power circuits you need. Also with 6500s, you can share the power load between two power supplies or have the power supplies be redundant. That too would determine you circuit requirements.
