Wire size is based on the amperage of the load. Without knowing what the motors's full load amperage is, an answer can not be given.
How to calculate a cable size of 3kw motor
12
Depends on the current rating which should be on the motor.
The simplest synchronous motor has two leads which must be connected to the live and neutral of the correct supply voltage as marked on the motor.
Wire size for any piece of equipment is based on the equipments load amperage. The higher the amperage that larger the wire size has to be. For motor loads the motor's amperage has to be increased by 25% to size the conductor. Example, a 10 amp motor load current plus 25% equals 12.5 amps. This would boost the wire size from a #14 to a #12 conductor. This additional amperage increasing is also used for transformer conductor sizing.
The ground wire size is determined from the current carrying capacity of the motor feeders.
The size of wire needed for a trolling motor depends on the motor's maximum amperage draw and the length of the wire run. A general guideline for a 12V trolling motor is 6-gauge wire for runs up to 10 feet, 4-gauge wire for runs up to 20 feet, and 2-gauge wire for runs over 20 feet to minimize voltage drop and ensure proper performance. Be sure to consult the manufacturer's recommendations for your specific trolling motor.
For a 7.5 hp motor operating at 240V, you would typically use a 14-gauge wire and a 40 amp breaker. However, it is best to consult the motor's specifications and the National Electrical Code to determine the exact wire size and breaker needed for your specific setup.
12/2 with ground.
You will need AWG #3 if it is a short run.
12 gauge wire is used for household plugins, and 14 gauge wire is used for lights. So, 12 gauge is the size to use. But since a freezer has an electric motor, it is best to not plug anything else with a motor into the same circuit.
3 core 35 sq mm alu. Or 3 core 25 sq mm cup.