50 hp motor: how many amps?
Full-load current from NEC Article 430 tables.
130 A
50 hp motor full-load current at 230 V three-phase · 37.30 kW output
Full-load current by voltage
| Supply | Full-load amps | Conductor ampacity (125%) |
|---|---|---|
| 208 V three-phase | 143 A | 178.8 A |
| 230 V three-phase | 130 A | 162.5 A |
| 460 V three-phase | 65.0 A | 81.2 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 50 hp motor draw?
Per NEC tables, 143 A A at 208 V three-phase; 130 A A at 230 V three-phase; 65.0 A A at 460 V three-phase.
How many watts is 50 hp?
50 hp = 37300 W of mechanical output. Electrical input is higher because of motor efficiency and power factor.