Full-load current
14 A
Motor FLC from the applicable NEC table.
NEC Table 430.250
Calculator 01 / NEC 430
Motor & load sizing
Enter motor nameplate basics for a traceable starting point on branch-circuit sizing.
Motor inputs
Loading saved calculations…
Saved on this device · no cloud sync
Branch-circuit conductor
14 AWG
Required ampacity: 17.5 A → 20 A copper (75°C).
NEC 430.22(A) · Table 310.16
Short-circuit protection
35 A breaker
Computed: 35 A (250% × FLC) → next standard size.
NEC 430.52(C)(1) · 240.6(A)
Motor controller / starter
NEMA Size 1
Minimum HP-rated controller; Size 1 supports 10 HP at 460 V. NEMA ratings use the 200 V column for 208 V systems (conservative convention).
NEC 430.83 · UL 508A
Overload relay setting
17.5 A
125% × FLC; set relay at or below this calculated maximum.
NEC 430.32(A)(1)
How this was calculated
- Look up $14 A FLC in NEC Table $430.250 for $10 HP, $460 V, $three-phase.
- Multiply FLC by 125% per NEC 430.22(A), then select the smallest copper conductor in Table 310.16 (75°C) that meets $17.5 A.
- Multiply FLC by $250% per NEC 430.52(C)(1), then round up to NEC 240.6(A): $35 A → $35 A.
- Select a controller rated for at least the motor HP per NEC 430.83 and the corresponding NEMA starter size; set overload protection to $125%% of FLC.
Engineering disclaimer: These results are a design aid and must be reviewed by a licensed professional engineer and the authority having jurisdiction. Verify nameplate data, installation conditions, conductor temperature/adjustment, and manufacturer instructions. Rule data is transcribed from the cited NEC tables for reference — always verify against the current licensed copy of the code.