20 amp should do ya.
It depends on what the amperage of the motor is. The motors amperage depends on the voltage of the motor. The higher the voltage the motor operates on the lower the amperage. So unless the amperage from the motor's nameplate is stated an answer can not be given.Just remember that the feeder capacity to the motor has to be 125% of the motors full load amperage and the breaker protecting the conductors to the motor has to be rated at 250% of the motors FLA. This higher breaker size allows the motor to start without tripping a normal size breaker that is rated for the lower conductor size.
A 1/2 HP 115volt motor draws 9.8 amps. This is a nominal book amperage for a 1/2 HP motor, check the nameplate for an accurate value. A breaker, to protect this size motor, has to be rated at 250% of the motors full load amps. In this case a 25 amp breaker in needed. If using the actual nameplate amperage, multiply it by 250% to find the size of the breaker to use. If the motor used 230 volts as a supply a two pole 15 amp breaker would work.
The first thing you have to do is find the full load amps of the motor. The wire size feeding the motor has to be 125% of the full load current. The breaker is usually 250% of the full load current. If the voltage and amperage had been added to the question the exact breaker size could have been calculated.
The electrical code book states that a 40 HP 230 volt three phase motor draws 104 amps. For that motor the wire must be rated for 131 amps, Non time delay fuses at 300 amps, time delay fuses at 175 amps or a 250 amp circuit breaker. When calculating wire sizes and motor protection the motor's full load amperage should be taken from the motor's nameplate.
probably about 50 hp depending on how reliable the efficiency ratings of the various manufacturers are
16A
How much oil do I use per gallon of gas for a 40 HP Johnson motor
1 HP electric motor = 1.5 HP hydraulic motor so for a 3 HP electric motor you would need a 4.5 HP hydraulic motor. Also for your information a 1 HP hydraulic motor = 1 2/3 HP gasoline engine.
im trying to find out what to mix the gas at for a 40 hp evinrude outboard motor
The main breaker is not based on the HP of the motor it is based on the FLA of the motor. Many different motors have different characteristics and all of the different motors have different amperages Once you have the amperage of the motor the breaker is 250% times the FLA of the motor.
The wire size and the circuit breaker for a 125 hp motor must consider the length of lead wire to the motor (essentially the distance of the motor from the supply). 125 hp is a VERY large motor and would be used only in industrial applications. You will need to consult a technician for proper advice, but the general answer to your question follows: The current draw on such a large motor would be approximately 300 amps. That is very large, and would require a wire size of 0000 AWG or 750M. 0000 AWG is 0.46 inches (11.68 mm) in diameter. As you can see, the wire is very large. It is not something you could install yourself.