Motor feeder sizing that follows NEC 430
Motor circuits have distinct rules for conductors, branch protection, and overloads. ekx applies the ordinary branch rules automatically and keeps advanced equipment checks contextual.
What you get
Conductors sized at 125% of motor FLC per NEC 430.22, with temperature correction and derating.
Maximum overcurrent protection device sizes selected from NEC Table 430.52 by motor type.
Full-load current values from NEC Tables 430.247–250 applied automatically by HP and voltage.
Voltage drop at the motor terminals calculated and flagged if it exceeds your threshold.
A quiet NEC 430.32 recommendation based on entered nameplate FLA and service factor.
Change motor HP, voltage, or type and the entire feeder resizes instantly.
Motor circuit sizing without the NEC lookup marathon
Sizing a motor feeder means cross-referencing FLC tables, conductor ampacity, and OCPD limits. ekx automates the ordinary branch and surfaces overload guidance without interrupting the workflow.
- Place a motor, specify HP and voltage — feeder sizes automatically
- NEC 430 FLC tables, conductor rules, and OCPD limits all applied
- Change motor HP and every component in the feeder adjusts
- Voltage drop at the motor terminals calculated as part of load flow
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View All PlansFrequently asked questions
EKX currently uses NEC Table 430.248 for supported single-phase motors and Table 430.250 for supported three-phase motors. It requires an exact table combination and otherwise falls back to entered nameplate current.
Motor type affects OCPD sizing per NEC Table 430.52. You can specify the motor type and ekx selects the correct maximum OCPD percentage.
ekx sizes branch circuits for individual motors. For feeders supplying multiple motors, the system considers the sum of FLCs plus the largest motor's contribution per NEC 430.24.
Yes. Conductors and OCPDs can be reviewed and overridden. Overload guidance is informational unless the corresponding protection equipment is explicitly modeled.
Motor feeders sized per NEC 430, automatically.
FLC tables, conductor sizing, OCPD limits — all handled.