1. What is Three Phase Amperage Calculation?

The three phase amperage calculation determines the current flow in a three-phase electrical system based on power, voltage, and power factor. It's essential for proper electrical system design and equipment sizing.

2. How Does the Calculator Work?

The calculator uses the three phase amperage formula:

Where:

• \( I \) — Current in amperes (amps)
• \( P \) — Power in watts
• \( V \) — Voltage in volts
• \( PF \) — Power factor (dimensionless, 0-1)
• \( \sqrt{3} \) — Approximately 1.732 (dimensionless)

Explanation: The formula calculates the current required in a balanced three-phase system given the power, voltage, and power factor.

3. Importance of Three Phase Current Calculation

Details: Accurate current calculation is crucial for proper circuit breaker sizing, wire selection, transformer specification, and ensuring electrical system safety and efficiency.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, and power factor as a decimal between 0 and 1. All values must be positive numbers with power factor between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It affects the actual current drawn by equipment and impacts system efficiency.

Q2: When should I use this calculation?
A: Use this for balanced three-phase AC systems to determine current requirements for motors, heaters, and other three-phase loads.

Q3: What are typical power factor values?
A: Power factor typically ranges from 0.7 to 1.0. Motors often have 0.8-0.9 PF, while resistive loads have 1.0 PF.

Q4: Does this work for single-phase systems?
A: No, this formula is specifically for three-phase systems. Single-phase calculations use a different formula without the √3 factor.

Q5: What if my system is unbalanced?
A: This calculator assumes a balanced three-phase system. For unbalanced systems, more complex calculations are required for each phase.