Which NEC article covers motors and motor circuits?

• A. Article 430
• B. Article 440
• C. Article 450
• D. Article 480

Answer: (A)

The exact rules for motors and their control systems are gathered in a single NEC article that focuses on how motors are powered, protected, and controlled. This article defines what constitutes a motor, motor circuit, and motor controller, and then lays out the requirements for motor conductors, overcurrent protection, and protection coordination. It covers the proper sizing and installation of branch-circuit conductors feeding motors, the need for appropriate disconnecting means, and the use of motor controllers and overload protection. It also addresses how motor control circuits should be wired and protected, and it provides guidance on acceptable starting methods and protection that keep motor operation safe and reliable. In short, this article is dedicated to the electrical design and safety rules specific to motors and their associated circuits.

The other topics covered by the remaining articles deal with different equipment categories—such as air-conditioning and refrigeration equipment, electric heating equipment, and other electrical systems—so they are not the focused source for motor-specific requirements.