Rules of Thumb

Rules of Thumb

Amp Draw:
Single Phase 115V = 10 amp/hp
230V = 5 amp/hp

Three Phase 230V = 2-1/2 amp/hp
460V = 1-1/4 amp/hp

Power Cost per HP:
at 10 cents/kWh = $750/year for 1hp constant run

Electric Motor vs. Air Motor:
Takes 1hp electric motor to equal 8hp air motor