A #6 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 65 amps.
A #8 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 45 amp which is too small for a 45.5 amp load.
The link below shows a typical usage and a chart
A # 10 copper conductor will limit the voltage drop to 2% or less when supplying 30 amps for 65 feet on a 240 volt system.
A #2 copper conductor with an insulation factor of 90 degrees C is rated at 130 amps.
A #1 copper conductor with an insulation factor of 75 degrees C is rated at 130 amps.
AWG #8 wire on a 40 amp breaker.
10 AWG.
10 mm2 cross section should be sufficient (#6 wire?)
At the service entrance you will need AWG 1/0 gauge.
4800
Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
AWG # 10.
10 gauge will work fine.
5 amps
A #14 wire will do the job.
10 mm2 cross section should be sufficient (#6 wire?)
At the service entrance you will need AWG 1/0 gauge.
30 amps.
10 gauge
Wire sizes are governed by the amperage the wire is to carry. To answer this question the load current is required.
4800
Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
AWG # 10.
10 AWG copper.