8.a. Which of the following most accurately describes the difference between a contactor and a starter? A. A starter contains a contactor and some additional protective circuitry. B. A starter is always mounted in an enclosure. C. A starter contains reversing contacts. D. A starter is always three-phase while a contactor may be single-phase or three-phase.

8.a. Which of the following most accurately describes the difference between a contactor and a starter?
A. A starter contains a contactor and some additional protective circuitry.
B. A starter is always mounted in an enclosure.
C. A starter contains reversing contacts.
D. A starter is always three-phase while a contactor may be single-phase or three-phase.
8.b. The main bus in a motor control center is used to
A. reduce the possibility of overload with large loads.
B. enclose motors within a protective shield.
C. distribute power to all starters in the center.
D. reduce the voltage of the plant's supply.