The 6430 input voltage in the US requires a voltage between 190 to 250Vac. The AC Input to the 6430 AC Source goes directly to a Bridge Rectifier and creates a DC Bus. Since the Input is isolated from Ground it can be connected as Line /Phase to Neutral or Line/Phase to Line/Phase. In the US there are 4 common voltages in this range. They are:

• 208 Vac which is line to Neutral
• 220 Vac which is Line to Neutral
• 230 Vac which is Line to Line
• 240 Vac which is Line to Line

Any of these will work to operate the Chroma 6430 AC Source. The Inputs of the 6430 are isolated from Ground so it is OK to connect a Neutral or a Phase to the Input terminal labeled N.