7.5 hp motor: how many amps?
Full-load current from NEC Article 430 tables.
40 A
7.5 hp motor full-load current at 230 V single-phase · 5.59 kW output
Full-load current by voltage
| Supply | Full-load amps | Conductor ampacity (125%) |
|---|---|---|
| 115 V single-phase | 80 A | 100.0 A |
| 230 V single-phase | 40 A | 50.0 A |
| 208 V three-phase | 24.2 A | 30.2 A |
| 230 V three-phase | 22 A | 27.5 A |
| 460 V three-phase | 11.0 A | 13.8 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 7.5 hp motor draw?
Per NEC tables, 80 A A at 115 V single-phase; 40 A A at 230 V single-phase; 24.2 A A at 208 V three-phase; 22 A A at 230 V three-phase; 11.0 A A at 460 V three-phase.
How many watts is 7.5 hp?
7.5 hp = 5595 W of mechanical output. Electrical input is higher because of motor efficiency and power factor.