Amp Calculator 3 Phase

Three-Phase Current Formula:

\[ I = \frac{P}{\sqrt{3} \times V \times PF} \]

Current (I):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Three-Phase Current Calculation?

Three-phase current calculation is used to determine the electrical current flowing in a three-phase power system. This calculation is essential for electrical engineering, power distribution, and equipment sizing in industrial and commercial applications.

2. How Does the Calculator Work?

The calculator uses the three-phase current formula:

\[ I = \frac{P}{\sqrt{3} \times V \times PF} \]

Where:

\( I \) — Current in amperes (amps)
\( P \) — Power in watts
\( \sqrt{3} \) — Square root of 3 (approximately 1.732)
\( V \) — Voltage in volts
\( PF \) — Power factor (unitless, between 0 and 1)

Explanation: This formula calculates the line current in a balanced three-phase system, accounting for the phase relationship between voltage and current through the power factor.

3. Importance of Three-Phase Current Calculation

Details: Accurate current calculation is crucial for proper circuit breaker sizing, wire selection, transformer rating, motor protection, and overall electrical system design and safety.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, and power factor (typically between 0.8 and 1.0). All values must be positive, 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 accounts for phase differences between voltage and current, affecting the actual current drawn by inductive or capacitive loads.

Q2: When should I use this calculation?
A: Use for three-phase motor sizing, transformer selection, circuit breaker rating, cable sizing, and any three-phase electrical system design.

Q3: What is the typical power factor value?
A: For resistive loads, power factor is 1.0. For inductive loads like motors, it's typically 0.8-0.9. For capacitive loads, it can be leading (less common).

Q4: Can this be used for single-phase systems?
A: No, this formula is specifically for three-phase systems. Single-phase calculations use different formulas without the √3 factor.

Q5: What are safety considerations?
A: Always include safety margins in calculations. Consult electrical codes and standards, and consider consulting a licensed electrician for critical applications.