or just specify the amperage you require per phase...
in a worst case (especially for temporary requirements) you just see thicker three phase cable running to where you need / want it.
Don't know about the other parts of the world, but in NZ as soon as you exceed 55(?) amps per phase you go to different connectors which is something else to consider.
Temporary power normally comes with break out boxes to give the correct outlets for your requirements
Also remember that three phase is for motors, so if you are just running power hungry devices the loading across the phases is not important... but balancing the load so you don't exceed and trip one phase is.
I have never had a problem acquiring power delivery of the required amperage in either three or single phase.
Remember that most coffee machines don't actually need
three phases, rather lots of power - which can be delivered from a single phase if necessary.