What is the amperage of a 20 hp, 240 volt, single phase motor?

To determine the amperage of a 20 horsepower (hp), 240-volt, single-phase motor, you can use the formula that relates horsepower, voltage, efficiency, and power factor. The formula for calculating the current (amperage) is:

I = (HP × 746) / (Voltage × Efficiency × Power Factor)

In this case, for a typical single-phase motor, we can make a general assumption about efficiency (usually around 0.9 for good motors) and power factor (which is often around 0.8 to 0.9, but can be taken as 1 for a simple calculation). Thus, we can simplify the calculations:

1. Convert horsepower to watts, knowing that 1 HP is equivalent to approximately 746 watts.

• 20 HP × 746 W/HP = 14,920 W.

2. Use the voltage provided (240 volts) to find amperage.

• Rearranging the formula gives:

[ I = \frac{Power (Watts)}{Voltage (Volts)} ]

• Plugging in the values:

[ I = \frac{14,920 W}{240 V} \approx 62