A motor branch circuit, or motor branch, is a circuit that provides power and protection for a motor. According to the National Electrical Code® (NEC®), a motor branch must have a means to disconnect the entire branch from its power supply and a means to protect the branch components from the potentially damaging effects of excessive current. How a motor branch functions and how the necessary protection is provided are the subjects of this course.
Describe a typical motor branch circuit.
State the functions of the following devices used in a motor branch circuit: safety switches, fuses, molded-case circuit breakers, and magnetic controllers.
Describe the difference between low-impedance and high-impedance grounding systems.
Describe typical preventive maintenance procedures for motor branch circuits.
Describe the basic troubleshooting procedure.
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