All commercial grade treadmills require a dedicated, 20-AMP circuit and plug into a 5-20/ NEMA receptacle. This set up is commonly referred to as a "homerun" in the electrician field. A dedicated circuit means that no other appliances, lamps, etc are on that circuit. Having a dedicated circuit allows your treadmill to draw 100% the power it needs to operate. When a circuit is shared, the treadmill can be starved for power, which can lead to poor performance and greatly reduced longevity.