It's single phase. The potential difference between the hot (active) wire and the neutral wire is nominally 240VAC.
For the US:
- Hot=Black.
- Neutral=White.
- Ground=Green or bare copper.
For Australia:
- Active=Brown or Red.
- Neutral=Blue or Black.
- Earth=Green with yellow stripe.
Why don't you just use a switching power supply that is either universal (auto-sensing) or switchable between 115VAC or 230VAC? If your mod uses DC power then it doesn't matter whether the input AC voltage is 230VAC or 240VAC because there will be a transformer that transforms the voltage to a lower voltage and then it will be full wave rectified and regulated by the switching power supply.
Northfield, MN
