Calculating Full Load Amps for a 3-Phase Motor

Calculating Full Load Amps

Full Load Amps (FLA) is a crucial parameter to determine the electrical requirements of a motor during operation. In this scenario, we are calculating the FLA for a 3-phase motor with a power rating of 5 HP and operating at 400 V.

To calculate the FLA for a 3-phase motor, we can use the formula:

FLA = (Power in HP * 746) / (Square root of 3 * Voltage)

Substitute the given values into the formula:

FLA = (5 * 746) / (1.732 * 400)

First, calculate the square root of 3, which is approximately 1.732. Then, plug in the values and simplify the equation to find the FLA:

FLA = (3730) / (692.8)

FLA ≈ 8.64 A

Therefore, the approximate Full Load Amps for a 3-phase, 5 HP motor operating at 400 V is 8.64 A. This value is essential for sizing protective devices and determining the electrical capacity required for the motor's operation.