3/4 hp motor: how many amps?
Full-load current from NEC Article 430 tables.
6.9 A
3/4 hp motor full-load current at 230 V single-phase · 0.56 kW output
Full-load current by voltage
| Supply | Full-load amps | Conductor ampacity (125%) |
|---|---|---|
| 115 V single-phase | 13.8 A | 17.2 A |
| 230 V single-phase | 6.9 A | 8.6 A |
| 208 V three-phase | 3.5 A | 4.4 A |
| 230 V three-phase | 3.2 A | 4.0 A |
| 460 V three-phase | 1.6 A | 2.0 A |
NEC 430.248/430.250 table values for typical induction motors; use these (not the nameplate) to size conductors and short-circuit protection, and the nameplate for overload protection.
FAQ
How many amps does a 3/4 hp motor draw?
Per NEC tables, 13.8 A A at 115 V single-phase; 6.9 A A at 230 V single-phase; 3.5 A A at 208 V three-phase; 3.2 A A at 230 V three-phase; 1.6 A A at 460 V three-phase.
How many watts is 3/4 hp?
3/4 hp = 560 W of mechanical output. Electrical input is higher because of motor efficiency and power factor.