20 hp motor: how many amps?
Full-load current from NEC Article 430 tables.
54 A
20 hp motor full-load current at 230 V three-phase · 14.92 kW output
Full-load current by voltage
| Supply | Full-load amps | Conductor ampacity (125%) |
|---|---|---|
| 208 V three-phase | 59.4 A | 74.2 A |
| 230 V three-phase | 54 A | 67.5 A |
| 460 V three-phase | 27.0 A | 33.8 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 20 hp motor draw?
Per NEC tables, 59.4 A A at 208 V three-phase; 54 A A at 230 V three-phase; 27.0 A A at 460 V three-phase.
How many watts is 20 hp?
20 hp = 14920 W of mechanical output. Electrical input is higher because of motor efficiency and power factor.