1. What is Full Load Current?

Full Load Current (FLC) is the maximum current that a motor or electrical device draws when operating at its rated power under full load conditions. It's a critical parameter for circuit protection and equipment sizing.

2. How Does the Calculator Work?

The calculator uses the Full Load Current formula:

Where:

• \( FLC \) — Full Load Current (amps)
• \( P \) — Power (watts)
• \( V \) — Voltage (volts)
• \( PF \) — Power Factor (unitless, between 0 and 1)

Explanation: The formula calculates the current required to deliver the specified power at the given voltage, accounting for the phase difference between voltage and current (power factor).

3. Importance of FLC Calculation

Details: Accurate FLC calculation is essential for proper circuit breaker sizing, wire gauge selection, and ensuring electrical systems operate safely within their rated capacities.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, and power factor (typically between 0.8-1.0 for most equipment). All values must be positive (power > 0, voltage > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical power factor value?
A: Induction motors typically have PF of 0.8-0.9, resistive loads have PF=1, and fluorescent lights might have PF around 0.5-0.9.

Q2: How does FLC differ from starting current?
A: Starting current (inrush current) can be 5-7 times higher than FLC for motors during the first few cycles.

Q3: Why is power factor important?
A: Lower power factor means higher current is needed to deliver the same real power, increasing system losses.

Q4: Can this formula be used for three-phase systems?
A: For three-phase, the formula is \( FLC = \frac{P}{\sqrt{3} \times V \times PF} \). Use line-to-line voltage.

Q5: How does FLC relate to circuit breaker sizing?
A: Circuit breakers are typically sized at 125% of FLC for continuous loads (NEC requirements).