Panelboards and main disconnects are covered by which NEC article?

• A. Article 500
• B. Article 517
• C. Article 725
• D. Article 408

Answer: (D)

Panelboards and main disconnects are governed by the NEC article that sets the rules for panelboards, distribution equipment, and the disconnecting means. This article specifies how panelboards must be constructed, rated, and installed, including the number of spaces, how conductors terminate, how overcurrent protection is applied, and where the disconnect must be located. It’s the reference you use to ensure the panelboard and any main disconnect are arranged and protected correctly. The other topics mentioned are covered in different sections: hazardous locations, healthcare facility electrical requirements, and power‑limited circuits, which don’t deal with panelboard construction and disconnecting needs.