What type of equipment is included in Article 440?

Article 440 of the National Electrical Code (NEC) specifically addresses the requirements for the installation of refrigerating equipment and related components. This includes systems used for refrigeration, air conditioning, and heat pumps.

The focus of Article 440 is on ensuring safety and efficiency while dealing with the unique characteristics of refrigerating systems, including the proper rating and protection of the motors involved. Given the context of the code, the provisions cover things such as maximum overcurrent protection, motor branch circuit conductors, and the appropriate disconnecting means, which are critical for the safe operation of refrigerating equipment.

In contrast, while transformers, storage batteries, and resistors are essential components in many electrical systems, they do not fall under the specific guidelines set forth in Article 440, which is tailored to the particular needs and safety measures necessary for refrigerating equipment. Therefore, the emphasis on refrigerating systems as the primary focus of Article 440 is what makes that answer correct.