Which article covers guidelines related to appliances?

The correct choice addresses the guidelines specifically related to appliances as provided in the National Electrical Code (NEC) Article 422. This article outlines the necessary requirements for the installation and use of appliances, covering aspects such as the conductors, connection methods, and general safety practices needed to ensure proper functioning and safety during operation.

Article 422 also helps to clarify the distinctions among different types of appliances and provides necessary details for how they should be wired and what safety measures should be taken during installation. It ensures that appliances are connected in a way that minimizes risk to both users and the system.

The other articles mentioned focus on different electrical elements or installations. Article 424 deals with heating, article 426 addresses the installation of signs, and article 440 pertains specifically to motor installations. This delineation of topics within the NEC ensures a structured and comprehensive approach to electrical installations and safety across a variety of applications, with Article 422 being dedicated to the critical area of appliance installation.