1. What is a 3-Phase Watts to Amps Calculator?

Definition: This calculator converts electrical power in watts to current in amps for three-phase AC systems.

Purpose: It helps electricians and engineers determine the current draw of three-phase electrical equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amps)
• \( P_w \) — Power (watts)
• \( V \) — Line-to-line voltage (volts)
• \( PF \) — Power factor (0 to 1)
• \( \sqrt{3} \) — Constant for three-phase systems (≈1.732)

Explanation: The formula accounts for the phase relationship in three-phase power systems.

3. Importance of 3-Phase Current Calculation

Details: Accurate current calculation ensures proper wire sizing, circuit protection, and equipment operation.

4. Using the Calculator

Tips: Enter the power in watts, line-to-line voltage (default 480V), and power factor (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between single-phase and three-phase?
A: Three-phase power provides three alternating currents, spaced 120° apart, allowing more efficient power delivery.

Q2: What's a typical power factor value?
A: Motors typically have 0.8-0.9 PF, while resistive loads have 1.0 PF.

Q3: Should I use line-to-line or line-to-neutral voltage?
A: Always use line-to-line voltage for this calculation.

Q4: How does this differ from single-phase calculation?
A: Single-phase uses I = P/(V×PF) without the √3 factor.

Q5: What if I know kilowatts instead of watts?
A: Multiply kW by 1000 to get watts before using this calculator.