Article 225 of the NEC regulates what?

• A. Regulations regarding outside branch circuits and feeders
• B. Open, aerial conductors
• C. Minimum size for aluminum conductors
• D. Thermoset insulation

Answer: (A)

The main idea here is understanding which part of the NEC governs wiring that originates outside a building and feeds the electrical system inside. Article 225 focuses on Outside Branch Circuits and Feeders, covering the rules for conductors and equipment that supply the premises from an outside source. It sets requirements for how those circuits are sized, protected, and protected by disconnecting means, and it defines how the external supply connects to the building’s distribution equipment. The other topics mentioned—open, aerial conductors; minimum sizes for aluminum conductors; and thermoset insulation—are addressed in different parts of the NEC. Therefore, the regulation of outside branch circuits and feeders is what Article 225 covers.