Calculate FLA, horsepower, kVA, NEC breaker size, and wire gauge for single-phase and three-phase motors.
| HP | 460V FLA (A) | 480V FLA (A) | Min. Conductor (A) | Max. Breaker Size |
|---|---|---|---|---|
| ½ | 1.1 | 1.0 | 1.4 | 3A |
| ¾ | 1.6 | 1.5 | 2.0 | 4A |
| 1 | 2.1 | 2.0 | 2.6 | 6A |
| 1½ | 3.0 | 2.9 | 3.75 | 8A |
| 2 | 3.4 | 3.3 | 4.25 | 9A |
| 3 | 4.8 | 4.6 | 6.0 | 12A |
| 5 | 7.6 | 7.3 | 9.5 | 20A |
| 7½ | 11 | 10.5 | 13.75 | 28A |
| 10 | 14 | 13.4 | 17.5 | 35A |
| 15 | 21 | 20.1 | 26.25 | 53A |
| 20 | 27 | 25.8 | 33.75 | 68A |
| 25 | 34 | 32.5 | 42.5 | 85A |
| 30 | 40 | 38.3 | 50 | 100A |
| 40 | 52 | 49.7 | 65 | 130A |
| 50 | 65 | 62.1 | 81.25 | 163A |
| 60 | 77 | 73.6 | 96.25 | 193A |
| 75 | 96 | 91.7 | 120 | 240A |
| 100 | 124 | 118.5 | 155 | 310A |
| 125 | 156 | 149.1 | 195 | 390A |
| 150 | 180 | 172.0 | 225 | 450A |
| 200 | 240 | 229.4 | 300 | 600A |
| AWG / MCM | Ampacity (A) | Typical Motor HP (460V 3Ø) |
|---|---|---|
| 14 AWG | 15A | Up to 1 HP |
| 12 AWG | 20A | Up to 1½ HP |
| 10 AWG | 30A | Up to 3 HP |
| 8 AWG | 50A | Up to 5 HP |
| 6 AWG | 65A | Up to 7½ HP |
| 4 AWG | 85A | Up to 10 HP |
| 3 AWG | 100A | Up to 15 HP |
| 2 AWG | 115A | Up to 15 HP |
| 1 AWG | 130A | Up to 20 HP |
| 1/0 AWG | 150A | Up to 25 HP |
| 2/0 AWG | 175A | Up to 30 HP |
| 3/0 AWG | 200A | Up to 40 HP |
| 4/0 AWG | 230A | Up to 50 HP |
| 250 MCM | 255A | Up to 60 HP |
| 350 MCM | 310A | Up to 75 HP |
| 500 MCM | 380A | Up to 100 HP |
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