Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
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12 AWG. You can run several hundred feet.
14-3 Is the standard wire use for residental smoke detectors.
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.
10 AWG.
12 gauge underground wire or if you think you will ever add any devices to this circuit use 10 gauge.