1. What is Single Phase Motor FLA?

Full Load Amps (FLA) is the current a motor draws while operating at its rated load and voltage. It's crucial for sizing circuit protection devices and conductors.

2. How Does the Calculator Work?

The calculator uses the single phase motor current formula:

Where:

• \( I \) — Full load current (amps)
• \( P \) — Power input (watts)
• \( V \) — Voltage (volts)
• \( PF \) — Power factor (0-1)
• \( \eta \) — Efficiency (0-1)

Explanation: The formula accounts for real power consumption by considering both the power factor and motor efficiency.

3. Importance of FLA Calculation

Details: Proper FLA calculation ensures correct sizing of circuit breakers, fuses, and wiring to prevent overheating and ensure safe operation.

4. Using the Calculator

Tips:

• Enter motor power rating in watts
• Input operating voltage
• Typical power factor: 0.85 for motors
• Typical efficiency: 0.75-0.95 (90% = 0.9)
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between FLA and LRA?
A: FLA is full load amps during normal operation. LRA (Locked Rotor Amps) is the higher current during startup.

Q2: How do I find my motor's power factor?
A: Check motor specifications or use 0.85 as a typical value if unknown.

Q3: Why is efficiency important in the calculation?
A: Motors convert electrical to mechanical power. Efficiency accounts for losses (heat, friction).

Q4: Can I use this for three-phase motors?
A: No, three-phase motors use a different formula accounting for √3 factor.

Q5: How much safety margin should I add?
A: Typically 125% of calculated FLA for circuit protection sizing.