Motor Current Guide: Nameplate FLA vs. Table FLC
Motor-current values can refer to a manufacturer nameplate rating, a standard-table value, or a model estimate. They are not interchangeable.
Important: A model estimate is not a nameplate or code-table value and does not establish correct equipment selection.
Identify the source
- Nameplate current is marked by the motor manufacturer for stated conditions. Check it with voltage, phase, frequency, service factor, and other ratings.
- Table current is defined by a particular standard for specified calculation tasks. Its use depends on the locally adopted edition, motor type, and applicable rule.
- Estimated current is a model result from inputs such as power, voltage, efficiency, and power factor; it does not reproduce a nameplate or standards table.
Verify before using a value
- Record nameplate data and manufacturer instructions.
- Identify the installation location and adopted standard edition, then check the exact rule for the task.
- Check conductor ampacity, overload protection, short-circuit protection, disconnects, and starter selection separately; they can require different inputs.
- Ask a qualified electrical professional to review unclear ratings, exceptions, or installation conditions.
For U.S. installations where adopted, consult the locally adopted edition of NFPA 70 and the authority having jurisdiction.