1.5 hp motor: how many amps?
Full-load current from NEC Article 430 tables.
10 A
1.5 hp motor full-load current at 230 V single-phase · 1.12 kW output
Full-load current by voltage
| Supply | Full-load amps | Conductor ampacity (125%) |
|---|---|---|
| 115 V single-phase | 20 A | 25.0 A |
| 230 V single-phase | 10 A | 12.5 A |
| 208 V three-phase | 6.6 A | 8.2 A |
| 230 V three-phase | 6 A | 7.5 A |
| 460 V three-phase | 3.0 A | 3.8 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 1.5 hp motor draw?
Per NEC tables, 20 A A at 115 V single-phase; 10 A A at 230 V single-phase; 6.6 A A at 208 V three-phase; 6 A A at 230 V three-phase; 3.0 A A at 460 V three-phase.
How many watts is 1.5 hp?
1.5 hp = 1119 W of mechanical output. Electrical input is higher because of motor efficiency and power factor.