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.
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
This answer is taken from the CEC. Table 17 states minimum size of grounding conductors. For a service conductor drawing 400 amps a #3 copper grounding conductor is needed. Also see rules 10-206, 10-700 and 10-812 if you have access to the code book.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
what size motor
When you talk of voltage, you should be thinking of the insulation factor of the wire. By the same token when you talk of wire size, it is based on the amperage the wire is required to handle.
between 40hp and 125hp
The minimum size wire that can be paralleled together stated in the electrical code book is a #3 copper conductor.
Depends if it fiberglass or Aluminium. For Fiberglass you would be looking at around 50hp-60hp and and Aluminium would be between 30hp and 40hp.
A 60 horsepower motor typically requires a minimum breaker size of 100 Amps for normal operation. It is important to consult the motor's specifications or a licensed electrician to ensure the correct breaker size for safe and efficient operation.
For a 175 ampere motor, the recommended minimum wire size would be 2/0 AWG (American Wire Gauge) for copper wire. This size is typically used for high current applications to ensure proper conductivity and prevent overheating of the wires. It's important to consult local electrical codes and regulations to ensure compliance.
The wire that is used for connecting the ground rod or plate to the electrical distribution is governed by the size of the electriclal distribution. In Canada a #6 bare copper is the minimum size for a 200 amp service.
The minimum wire size for a 30Amp breaker is typically 10 AWG for copper wire and 8 AWG for aluminum wire, according to the National Electrical Code (NEC). This wire size is necessary to safely carry the amount of current without overheating.
A #1 copper conductor with an insulation rating of 90 degrees C is rated at 145 amps.
You would need to use a wire size that is rated for at least 40 amps to be safe and to meet the requirements of the air conditioner. A common wire size for this application would be 8 AWG copper wire, which is rated for 40 amps.
Electric generators typically contain copper windings to conduct electricity. The percentage of copper in an electric generator can vary, but it can range from 20% to 30% of the total weight of the generator. Copper is favored for its high electrical conductivity and resistance to heat.
This answer is taken from the CEC. Table 17 states minimum size of grounding conductors. For a service conductor drawing 400 amps a #3 copper grounding conductor is needed. Also see rules 10-206, 10-700 and 10-812 if you have access to the code book.
30 amp breaker with #10 gauge copper wire