1. What is 3 Phase HP to Amps Calculation?

The 3-phase horsepower to amps calculation determines the electrical current required by a three-phase motor given its power rating in horsepower, voltage, efficiency, and power factor.

2. How Does the Calculator Work?

The calculator uses the 3-phase formula:

Where:

• \( I \) — Current in amperes (A)
• \( HP \) — Horsepower rating of the motor
• \( V \) — Voltage (line-to-line for 3-phase)
• \( eff \) — Motor efficiency (0 to 1)
• \( PF \) — Power factor (0 to 1)
• 746 — Conversion factor from HP to watts

Explanation: The formula converts mechanical power (HP) to electrical power (watts), then calculates current considering the three-phase power characteristics.

3. Importance of Current Calculation

Details: Accurate current calculation is essential for proper wire sizing, circuit breaker selection, and motor protection to prevent overheating and ensure safe operation.

4. Using the Calculator

Tips: Enter horsepower rating, line voltage, motor efficiency (typically 0.8-0.95), and power factor (typically 0.8-0.9). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply HP by 746?
A: 746 watts equals 1 horsepower, so this converts mechanical power to electrical power.

Q2: What is typical motor efficiency?
A: Standard motors range from 80-95% efficient, with higher HP motors generally more efficient.

Q3: What affects power factor?
A: Load conditions - PF is lower at partial loads. Induction motors typically have PF between 0.8-0.9 at full load.

Q4: Is this for line or phase current?
A: The result is line current for a balanced three-phase system.

Q5: How does voltage affect current?
A: Current is inversely proportional to voltage - higher voltage means lower current for the same power.