As has been said previously, the normal supply in the uk is 230/400V
Each of the three lines is 230V when measured between line and earth/neutral
BUT measure between lines you will get 400V.
This is part of your basic training, you probably ought to re-familiarise yourself with it if you are dealing with a site which has three phase.
If you have a 32A supply available, you could fit a single phase EVCP connected to any one of the three phases and neutral - this would charge at 32A or 7.4kW, obviously you would need a supply cable - either 2 or 3 core SWA usually (3c if you need the earth at the charge point).
If you use a three phase charge point this would charge at 32A per phase, so 22kW in total, in this case you would need a 4 or 5 core SWA (5c if you need the earth at the charge point). A 3ph charge point is around £100 more expensive than a single phase, but can charge up to 3x as fast.
Look in the standard charge cable connector - there are 5 main contacts and two small - the 5 main are the three phases, neutral and earth (be it from the supply or a specific TT for the EVCP).
The vehicle charger itself (in the vehicle) determines from the two small contacts what the maximum charge current is and then takes up to the limit of the charge point or the charger itself.
So some cars have a max of 6.6kW
- if you connect it to a 16A 1 ph EVCP it would charge at 3.6kW
- if you connect it to a 32A 1 ph EVCP it would charge at 6.6kW
- if you connect it to a 32A 3 ph EVCP it would charge at 6.6kW
Some other cars have a max of 11kW
- if you connect it to a 16A 1 ph EVCP it would charge at 3.6kW
- if you connect it to a 32A 1 ph EVCP it would charge at 7.4kW
- if you connect it to a 32A 3 ph EVCP it would charge at 11kW
Some other cars have a max of 22kW
- if you connect it to a 16A 1 ph EVCP it would charge at 3.6kW
- if you connect it to a 32A 1 ph EVCP it would charge at 7.4kW
- if you connect it to a 32A 3 ph EVCP it would charge at 22kW
I would always try for the largest I could, because more and more cars will be able to handle the larger values as time goes on.
The work is exactly the same - run the cable connect in the EVCP end and connect (Via a RCD/RCBO if specified) into the supply - usual methods be it single or three phase.