Motor FLA Lookup (NEC 430) Skip to main content
Electrical Free Pro Features Available

Motor FLA Lookup (NEC 430)

Local motor full-load amp rows with conductor and protection sizing context, source warnings, and AHJ review boundaries

Field guide: PowerFlex Catalog Number Guide: Two Formats, the Output-Current Trap, 523 vs 525, Voltage-Dependent 750 Power, and Frame-Gated Enclosures

PREVIEW All Pro features are currently free for a limited time. No license key required.

Electrical
Pop Out

Motor starter kit

Starter and measurement parts tied to NEC motor current lookup:

As an Amazon Associate, ToolGrit earns from qualifying purchases, at no extra cost to you. These are hand-picked suggestions; calculator results are not influenced by them.

Look up motor full-load amps by horsepower, voltage, and phase, then see preliminary overload, conductor ampacity, and protection percentage estimates. The FLA rows follow NEC Tables 430.248 and 430.250, and the 75°C ampacity rows follow Table 310.16 - still verify them against the adopted NEC edition, local amendments, equipment listing, manufacturer instructions, and AHJ requirements before design use. It does not create a permit drawing, conductor schedule, OCPD selection, coordination study, inspection approval, or safe-work authorization.

Pro Tip: Treat the displayed overload, conductor, fuse, and breaker values as review prompts. Final motor-circuit work still needs the selected motor nameplate, motor type, service factor, temperature rise, controller and overload data, terminal ratings, derating, voltage drop, standard device sizes, SCCR/AIC, manufacturer instructions, adopted code, AHJ, and qualified electrical review.

Calculate ideal voltage, current, and power before electrical review

Ohm's Law / Power Wheel Calculator →

Estimate locked-rotor current from nameplate code letters

Motor Starting Current / Code Letter Calculator →

Review cable tray fill assumptions for motor feeder cables

Cable Tray Fill Calculator (NEC 392) →

How It Works

  1. Select Motor Parameters

    Choose horsepower, nominal voltage, and single-phase or three-phase mode. The app returns the table FLA value per NEC Tables 430.248/430.250; verify against the adopted code edition before design use.

  2. Review Full-Load Amperage

    Use the displayed FLA as a planning row to compare against the selected source material, motor nameplate, and project requirements.

  3. Review Protection and Wire Estimates

    Review the simple percentage and 75°C ampacity estimates, then verify terminal temperature, derating, standard device size, coordination, equipment listing, manufacturer instructions, and AHJ rules before design use.

Assumptions

  • Local FLA rows are selected by horsepower, nominal voltage, and phase.
  • Conductor estimates use a 75°C ampacity row and do not apply terminal, ambient, fill, or adjustment rules.
  • Protection values are unrounded percentage products and do not select a standard device size.
  • Selected motor data, equipment listing, adopted code, AHJ, and qualified electrical review remain required.

Limitations

  • Local rows are not certified against the adopted NEC edition or local amendments.
  • Does not apply terminal-temperature, ambient, conductor-count, raceway-fill, voltage-drop, or manufacturer-instruction checks.
  • Does not choose overload relay, fuse, breaker, controller, disconnect, conductor, raceway, grounding, label, or feeder design.
  • Does not perform SCCR/AIC, selective coordination, arc-flash, shock, LOTO, inspection, or safe-energization review.

References

  1. NFPA 70 National Electrical Code source pointer for Article 430 and Table 310.16 context
  2. NEMA MG 1 source pointer for motor-type and manufacturer-data context
  3. NFPA 70E and OSHA electrical-safety source pointers for safe-work boundaries
  4. NIST SP 811 unit context

Frequently Asked Questions

No. It is a planning aid. The FLA rows follow NEC Tables 430.248 and 430.250, but verify every row and multiplier against the adopted NEC edition, local amendments, selected equipment, manufacturer instructions, and AHJ before decision use.
Motor-circuit rules often use different current bases for different decisions. This tool flags that distinction, but the selected motor, overload device, controller, and adopted code text still control final settings.
No. It shows percentage and ampacity estimates only. Standard device sizes, exceptions, time-current behavior, SCCR/AIC, terminal ratings, derating, voltage drop, listing, and coordination are not solved here.
Electrical work requires qualified personnel, LOTO or energized-work procedures, PPE, shock and arc-flash controls, site safety rules, and AHJ or utility requirements as applicable.
Disclaimer: This tool provides NEC-table lookup rows and planning estimates only. It is not a permit-ready NEC calculation, conductor schedule, OCPD selection, coordination study, inspection approval, or safe-work authorization.

Guides for this job

Electrical

PowerFlex Catalog Number Guide: Two Formats, the Output-Current Trap, 523 vs 525, Voltage-Dependent 750 Power, and Frame-Gated Enclosures

Plain-language Allen-Bradley PowerFlex catalog-number reference. How to split the dash-delimited 520-series (523/525) and the fixed 18-character 750-series (753/755/755 with Options); why the rating field is an output current not horsepower; why the 523 and 525 share the same Normal-Duty rating for a given code while the 1.6 A 1P6 is 523-only; why 750 HP/kW changes with voltage; and why a frame-wrong enclosure, braking, or HIM code is an impossible drive. Companion to the PowerFlex Drive Decoder.

Read Guide →
Electrical

Yaskawa Drive Code Guide: The GA-Series 7-Position Catalog Code, Legacy CIMR, and HD vs ND Current

Plain-language Yaskawa AC drive reference. How to read the GA500/GA800 7-position catalog code; why the model token is an output current, not HP, and is reused across families at different kW; why a legacy A1000/V1000 CIMR code is recognized but not fully position-walked; the Heavy-Duty vs Normal-Duty current distinction; and why HP/kW are shown as published. Companion to the Yaskawa Drive Decoder.

Read Guide →
Electrical

Danfoss VLT Type-Code Guide: FC 301/302, FC 102, FC 202, FC 51, the kW Power Code, and Normal vs High Duty

Plain-language Danfoss VLT FC reference. How to read the series and the kW power code (PK75 = 0.75 kW, P11K = 11 kW); how the T2/T4/T5/T6/T7 three-phase and S2/S4 single-phase voltage classes map; why Normal-Duty and High-Duty currents differ (P15K T5 = 27 A ND / 43.2 A HD); and which fields are reliable per family, including the FC 102 output-current gap. Companion to the Danfoss VLT Drive Decoder.

Read Guide →
Electrical

ABB ACS Drive Type-Code Guide: Reading the Designation, Per-Family Voltage Codes, ND/HD Ratings, and kW/HP Honesty

Plain-language ABB ACS drive type-code reference. How to read the series, construction, current rating, and voltage; why each family uses its own voltage-digit map; how Normal-Duty and Heavy-Duty differ and why the ACS355 is single-rating; when kW and HP are published versus a labeled conversion; the ACS880 380-500V 480 V reference convention; and which families and constructions are out of scope. Companion to the ABB ACS Drive Type-Code Decoder.

Read Guide →

More Electrical tools

Electrical Live

Can I Run This On That?

Check if your circuit breaker and wiring can handle a specific appliance. Enter breaker size, wire gauge, and load wattage for a pass/fail verdict based on NEC standards.

Launch Tool →
Electrical Live

Wire Sizing Calculator

Find the right AWG wire gauge for any electrical run. Enter amps, distance, and voltage to get NEC-compliant sizing with derating, voltage drop, and copper vs aluminum cost comparison.

Launch Tool →
Electrical Live

Generator Sizing Calculator

What size generator do you need? Add your appliances and loads to calculate total running watts and starting surge. Get a recommended generator size with built-in headroom.

Launch Tool →