Motor FLA vs. NEC FLC
FLA (full-load amps) is the motor's rated current under its stated operating conditions; use the value on the motor or equipment nameplate when you need nameplate current. FLC (full-load current) is also used as a code term. It is not safe to treat the two labels as interchangeable for every motor, calculation, or jurisdiction.
For U.S. installations, NEC Article 430 has distinct rules for motor conductors, branch-circuit short-circuit and ground-fault protection, and overload protection. The applicable path depends on the motor and equipment, exceptions, the locally adopted NEC edition, and the authority having jurisdiction. Confirm the exact rule in the adopted code and manufacturer instructions.
Which NEC motor table should you verify?
The table selection is part of the answer. Confirm the motor type and the edition adopted by the authority having jurisdiction before copying any value from NFPA 70.
| Reference | Scope to verify | Use boundary |
|---|---|---|
| Table 430.248 | Single-phase AC motors | Verify the motor type, horsepower, voltage column, edition and any applicable exception in the adopted code. |
| Table 430.249 | Two-phase AC motors | Do not substitute a single-phase or three-phase row because the horsepower and voltage look similar. |
| Table 430.250 | Three-phase AC motors | Verify the system voltage, frequency, motor type and the locally adopted edition before using a table value for a code calculation. |
Worked selection example: A 10 HP, 230 V, three-phase motor points to the three-phase table path, so start at Table 430.250. The table lookup is separate from the nameplate FLA, conductor ampacity, overload setting and short-circuit/ground-fault protection calculation. Record the exact edition, row, voltage column and local adoption before treating the value as a design input.
How to Find the Motor's Rated Current
- Read the motor or equipment nameplate for rated current and its matching voltage, phase, frequency, and connection.
- Check the manufacturer's installation instructions and equipment markings, especially for HVAC and refrigeration equipment.
- If the nameplate does not give the value needed for a code calculation, identify the motor type and use the applicable table and rules in the locally adopted electrical code. Do not infer a design value from horsepower alone.
For a U.S. NEC installation, consult the applicable edition of NFPA 70 and local adoption. The current NFPA publication is NFPA 70 (2026), National Electrical Code; jurisdictions may adopt a different edition or amendments.
FLA, FLC, RLA, and LRA
| Label | Where it is used | How to treat it |
|---|---|---|
| FLA | Motor or equipment nameplate / motor data | Rated full-load current under the stated conditions; record the matching voltage and phase. |
| FLC | Electrical code calculations | Use the value and calculation path specified by the applicable code for that motor and task. |
| RLA | Often shown for hermetic motor-compressors | Use the equipment documentation; do not assume it equals a general-purpose motor's FLA. |
| LRA | Motor-compressor or motor starting data | Starting / locked-rotor information; it is not the running FLA. |
Before Using a Motor Current Value for Design
First identify what you are sizing: a conductor, controller, disconnect, branch-circuit short-circuit and ground-fault protective device, overload device, or a voltage-drop estimate. These are separate tasks and may use different nameplate, code-table, equipment-marking, and installation inputs.
Confirm motor type, horsepower or output, rated voltage, phase, frequency, duty, and equipment listing. Then follow the adopted local electrical code and the manufacturer's instructions. A percentage copied from a generic chart is not a universal breaker, fuse, overload, or wire-selection rule.
Electrical code tables and standards are edition-specific and may be copyrighted. This guide does not reproduce unverified table values or claim that its content is a design approval.
Use the Current Estimator for a Planning Estimate
The linked calculator estimates operating current from entered power, voltage, phase, efficiency, and power factor, then applies a selectable rough starting-current factor. The result is a model estimate, not a motor-nameplate reading, code-table lookup, or NEC compliance check. Use manufacturer data and the applicable code for installation decisions.
Open the Motor Current Estimator →
Worked planning example
For a 5 kW, 400 V, three-phase motor with 90% efficiency and 0.85 power factor, the simplified running-current estimate is I = P ÷ (√3 × V × η × PF) = 5,000 ÷ (1.732 × 400 × 0.90 × 0.85) ≈ 9.4 A. This is a planning estimate only; nameplate current, starting behavior, conductor sizing, overloads, and overcurrent protection still require the equipment data and adopted code.
Source and Applicability
For U.S. work, use the NFPA 70 publication for the relevant edition, verify which edition and amendments the local jurisdiction has adopted, and consult the authority having jurisdiction when needed. Other countries and regions use different electrical rules; this page does not certify compliance outside the adopted U.S. NEC path.
Reviewed 2026-09-23. Numeric chart values remain unpublished until their source, edition, and motor applicability can be documented.
Frequently Asked Questions
Where can I find a motor's FLA?
Check the motor or equipment nameplate and the manufacturer's data for the rated voltage and phase. If you need a code-table value for an installation calculation, follow the locally adopted code path for that motor.
Can I use this page to choose a wire or breaker?
No. This page explains how to locate the right source. It does not provide a verified design table or determine conductor, overcurrent, or overload protection sizes.
Is the calculator result the motor's actual FLA?
No. It estimates current from the inputs and assumptions shown. Use the nameplate or manufacturer data for the motor's rated current.