You size wire by the current. Various insulations are rated for voltage, temperature and the medium where the wire will be run.
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Yes <<>> In North America, a three wire 120/240 volt system uses a neutral wire. For 240 volts two "hot" wires are used with no neutral.
Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
AWG # 10.
At the service entrance you will need AWG 1/0 gauge.
10 mm2 cross section should be sufficient (#6 wire?)