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You size wire by the current. Various insulations are rated for voltage, temperature and the medium where the wire will be run.
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
The key parameter in sizing wire is the current requirement. Once you know that you can look up value in a wire gauge table. The length of the run is important for longer runs because of the resistance of the wire itself. Aluminum wire requires a larger diameter than copper for the same current. Once you calculate the wire size you can then size the conduit.
Depends on the load it will carry which you failed to list.
You will need AWG #3 if it is a short run.