To answer this question the motor use should be defined. Knowing that information the right kind of protection can be installed and wiring methods defined.
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That depends on the voltage of the motor and the circuit. A 40 HP motor is a fairly large motor. If you don't know the answer to your own question, it's unlikely that you're qualified to wire it. Better consult and/or hire a qualified commercial electrician.
6 gauge if it is a very short distance.
what is the full load amps for 2.4 hp motor at 460 volts ?
how much copper in 250 hp motor
To answer this question an amperage has to be supplied. Wire size is based on the capacity of amperage it can legally conduct. This regulation is laid out in the electrical code book. To get installations passed by the electrical inspector these rules have to be followed.