Wire sizing is based on the amperage. The formula you need to find amperage from HP for single phase is
, I = HP x 746/E x %eff x pf. For three phase I = HP x 746/1.73 x E x %eff x pf.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
I = Amperage, E = Voltage.
When you have calculated the amperage ask a electrician to look up the wire size for that specific amperage. He should have a code book and there is a list of wire sizes and amperages. The quickest way of finding the amperage is by looking on the motor's nameplate. There you will find all of the information that you need.
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Cables spaced apart on cable ladder, shaded from sun
you need the current of motor or the KW/HP rating
Cable sizing is based on amperage of the load. The rating of the capacitor bank and the voltage at which it operated need to be stated to give an answer.
A 0.15Cu cable has a rating of 382 amps summer and 476 amps winter. 0.2Cu allows 425/530 amps. That is for outdoor use in overhead lines.
Wire sizing is based on the motors full load amperage. The amperage can be calculated but a voltage has to be stated. I = W/E. Amps = Watts/Volts. Restate the question with a voltage and an answer can be given.