1. What is Full Load Current (FLC)?

Full Load Current (FLC) is the current drawn by an electric motor when operating at its rated horsepower and voltage. The National Electrical Code (NEC) provides standard FLC values in Table 430.250 to simplify motor circuit design and protection calculations.

2. How Does the Calculator Work?

The calculator uses NEC Table 430.250 values based on:

• Motor horsepower (HP)
• Voltage (115V, 200V, 208V, 230V, 460V, or 575V)
• Phase (single-phase or three-phase)

The table values account for typical motor efficiencies and power factors at full load.

3. Importance of FLC Calculation

Details: FLC is used to determine conductor sizes, overcurrent protection, motor overload protection, and starter sizing. Using NEC table values ensures compliance with electrical codes.

4. Using the Calculator

Tips: Enter the motor nameplate horsepower, select the operating voltage and phase. For non-standard HP values, the calculator will use the next standard size below your input.

5. Frequently Asked Questions (FAQ)

Q1: Why use NEC table values instead of nameplate current?
A: NEC values are standardized for circuit design purposes and typically provide conservative estimates that account for worst-case conditions.

Q2: What if my motor voltage isn't listed?
A: Use the next higher voltage in the table. For example, use 230V values for a 240V motor.

Q3: How accurate are these values?
A: They represent typical values for Design B motors. Actual current may vary by ±10-15% depending on motor design and load.

Q4: What about motors larger than 200 HP?
A: For motors above 200 HP, consult the motor manufacturer's data or NEC 430.6(A)(2) for guidance.

Q5: Do these values apply to DC motors?
A: No, this calculator is for AC induction motors only. DC motors have different current characteristics.