NEC 430.248 / 430.250 · Motor FLC
Full-load amps by horsepower and voltage for single- and three-phase motors — the NEC table values you use to size conductors and protection.
| HP | 115 V | 208 V | 230 V |
|---|---|---|---|
| 1/2 | 9.8 | 5.4 | 4.9 |
| 3/4 | 13.8 | 7.6 | 6.9 |
| 1 | 16 | 8.8 | 8 |
| 1-1/2 | 20 | 11 | 10 |
| 2 | 24 | 13.2 | 12 |
| 3 | 34 | 18.7 | 17 |
| 5 | 56 | 30.8 | 28 |
| 7-1/2 | 80 | 44 | 40 |
| 10 | 100 | 55 | 50 |
| HP | 208 V | 230 V | 460 V |
|---|---|---|---|
| 1/2 | 2.2 | 2 | 1 |
| 3/4 | 3.1 | 2.8 | 1.4 |
| 1 | 4 | 3.6 | 1.8 |
| 1-1/2 | 5.7 | 5.2 | 2.6 |
| 2 | 7.5 | 6.8 | 3.4 |
| 3 | 10.6 | 9.6 | 4.8 |
| 5 | 16.7 | 15.2 | 7.6 |
| 7-1/2 | 24.2 | 22 | 11 |
| 10 | 30.8 | 28 | 14 |
| 15 | 46.2 | 42 | 21 |
| 20 | 59.4 | 54 | 27 |
| 25 | 74.8 | 68 | 34 |
| 30 | 88 | 80 | 40 |
| 40 | 114 | 104 | 52 |
| 50 | 143 | 130 | 65 |
| 60 | 169 | 154 | 77 |
| 75 | 211 | 192 | 96 |
| 100 | 273 | 248 | 124 |
NEC Tables 430.248 (single-phase) and 430.250 (three-phase). Per NEC 430.6(A), use these table values — not the motor nameplate amps — for sizing conductors and overcurrent/branch-circuit protection. Conductors are then sized at 125% of the table FLC for a single continuous-duty motor (430.22).
When you size a motor circuit, the NEC tells you to use the table full-load current (FLC), not the motor's nameplate amps. NEC 430.6(A)(1) points to Table 430.248 for single-phase motors and Table 430.250 for three-phase, by horsepower and voltage.
From the table FLC you size everything: conductors at 125% of FLC for a single continuous-duty motor (430.22), and branch-circuit short-circuit/ground-fault protection as a percentage of FLC by device type (430.52). The nameplate current is reserved for the overload device that protects the motor while it runs.
Wire ampacity for the sized conductor comes from the 310.16 ampacity chart; check long feeder runs with the voltage drop calculator. Field PM keeps your equipment list, panel schedules, and commissioning records together on the job.
NEC 430.6(A)(1) requires using the full-load current values from Tables 430.248/430.250 to size branch-circuit conductors and short-circuit/ground-fault protection — not the motor's nameplate current. The nameplate value is used for overload (running) protection.
For a single continuous-duty motor, the branch-circuit conductors must be at least 125% of the table FLC (NEC 430.22). For example, a 10 HP 460 V three-phase motor at 14 A FLC needs conductors rated for at least 17.5 A.
Motor branch-circuit protection is sized as a percentage of FLC depending on device type (NEC 430.52) — commonly up to 250% of FLC for an inverse-time breaker — and then rounded per the rules. Always work from the table FLC, not the nameplate.
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