1. What is Full Load Amps?

Full Load Amps (FLA) is the current a transformer draws when operating at its full rated capacity. It's a critical parameter for sizing circuit protection devices and conductors.

2. How Does the Calculator Work?

The calculator uses the basic power equation:

Where:

• \( I \) — Full load current (Amperes)
• \( VA \) — Apparent power (Volt-Amperes)
• \( V \) — Voltage (Volts)

Explanation: The equation calculates current by dividing the apparent power by the operating voltage.

3. Importance of Full Load Current Calculation

Details: Knowing the full load current is essential for proper transformer selection, circuit breaker sizing, and ensuring safe operation without overload.

4. Using the Calculator

Tips: Enter the transformer's VA rating and operating voltage. Both values must be positive numbers for valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between VA and watts?
A: VA represents apparent power (voltage × current), while watts represent real power. For purely resistive loads they're equal.

Q2: How does this differ for three-phase transformers?
A: For three-phase, use \( I = \frac{VA}{\sqrt{3} \times V} \). A separate three-phase calculator is recommended.

Q3: What safety margin should I add?
A: Typically 125% of calculated FLA is used for circuit protection sizing per electrical codes.

Q4: Does temperature affect the calculation?
A: The basic calculation doesn't account for temperature, but actual operating conditions may require derating.

Q5: Can this be used for DC transformers?
A: The same formula applies for DC systems, though DC transformers are less common than AC.