Which NEC article is commonly referenced for air-conditioning and refrigeration equipment design?

• A. Article 770
• B. Article 440
• C. Article 450
• D. Article 480

Answer: (B)

Air-conditioning and refrigeration equipment electrical design is addressed by the NEC article specifically dedicated to that equipment. This article lays out how these systems are to be wired, protected, and installed, including motor circuits, disconnecting means, and control wiring, and it often references other articles for related aspects of the installation. The other articles listed cover topics unrelated to HVAC design—fiber optic systems, general electric heating equipment, and storage batteries—so they don’t cover the electrical requirements for air-conditioning and refrigeration equipment. Therefore, the article dedicated to air-conditioning and refrigeration equipment is the standard reference for these designs.