01 Motor
02 Protection
03 Conductor
04 Notes
NEC Table 430.250 FLC values are used for conductor and OCP sizing per 430.6(A)(1). Motor nameplate current is used for overload sizing per 430.32.
This tool provides NEC-based sizing for general-purpose continuous-duty motors. Consult a qualified engineer for special applications.
Motor Circuit Summary
Full-Load Current—
Conductor Size—
OCP Device Rating—
Disconnect Size—
NEMA Starter
—
Methodology: NEC 2023 Table 430.250 FLC. Conductor sized per 430.22 at 125% FLC using Table 310.16 75°C column.
Calculation Breakdown
| Step | Value | NEC Reference |
|---|
Reference Tables — NEC 2023
Table 430.250: 3-Phase Motor FLC (amps)
| HP | 200V | 208V | 230V | 460V | 575V | 2300V |
|---|
Table 310.16: Ampacity (75°C column)
| Size | Cu (A) | Al (A) | Cu R (Ω/kft) | Al R (Ω/kft) |
|---|
Table 430.52(C)(1): OCP Percentages of FLC
| Motor Type | Non-Time Fuse | Dual-Element | Instant Breaker | Inverse Breaker |
|---|