HOLT Electricians Practice Exam 2025 - Free Electrician Certification Practice Questions and Study Guide

Question: 1 / 400

What is the VA input for a dual voltage 5 horsepower 3-phase motor rated at 460/230 volts?

4050 VA

5050 VA

6055 VA

To calculate the VA input for a dual voltage 5 horsepower 3-phase motor, it is essential to use the formula that converts horsepower to volt-amperes (VA). The formula for calculating the full-load current (I) for a 3-phase motor is:

\[

I = \frac{P \times 1000}{\sqrt{3} \times V}

\]

Where:

- P is the power in horsepower

- V is the line voltage

- The factor of 1000 converts horsepower to watts

- The square root of 3 accounts for the three-phase power system's relationship between voltage and current.

For a 5 horsepower motor, converting to watts gives:

\[

5 \, \text{hp} \times 746 \, \text{W/hp} = 3730 \, \text{W}

\]

In a three-phase system, we need to consider the voltage at which the motor operates. For the rated voltage of 460 volts, we can substitute the values into the formula:

\[

I = \frac{3730}{\sqrt{3} \times 460}

\]

Calculating that gives:

\[

I \approx \frac

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7050 VA

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