The 3-wire control circuit uses momentary contact devices to control the magnetic motor starter. Typically, single-phase motors can be started with full voltage across the line. Smaller horsepower ...

The BAS 1P™ single-phase motor starter is designed for use with exhaust fans, unit ventilators, and fan coil units in installations that have building automation systems, occupancy sensors, or timers.

Let’s run through an example problem to show you how this is done. What size conductor and inverse time circuit breaker are required for a 2-hp, 230V, single-phase motor with 75°C terminals (Figure)?