What is 230 volt 3 phase?

for USA, Canada and other countries running a 60 Hz supply service.

230 volt single phase refers to the two hot wires in standard house wiring but with the absence of the common return line, aka as the neutral wire.

As using only the "hot" side of phase one (120 volt) and only the "hot" side of phase two (120 volt), so that these two lines yield 240 volts in phase with each other, it is called "single phase".

This is sometime called 230 volts, "double phase" due to the two hot wires. Since both wires have the same phase, the term "double phase" is incorrect. As the two hots are balanced around the neutral point, "Split single phase" is the correct term to use.

Typical usage examples for 240 volts split single phase include: water heaters, electric clothes dryers, water pumps for wells, central and some larger window air conditioning units, air handlers, electric heating units, floor sanders, and portable arc welders.

230 V is the standard nominal voltage for single-phase electrical services to residences in Europe. It is obtained from a wye-connected, three-phase, four-wire, 400/230-V transformer secondary, by connecting between any line conductor and the neutral conductor.