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You CANNOT use UF cable to bring power to an outdoor spa. Any wiring outside of the home MUST be THHN/THWN wires installed in either PVC or Rigid conduit. The ground wire for the spa is REQUIRED to be insulated and it's not in UF cable.
Please get a copy of your local requirements for wiring a spa and obtain a permit. This is one of those times when it's even more important since water is involved and lives are at stake if done incorrectly.
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