Which NEC article governs temporary wiring on construction sites?

• A. Article 230
• B. Article 590
• C. Article 520
• D. Article 700

Answer: (B)

Temporary wiring on construction sites is treated as a distinct area because its conditions and hazards are different from permanent installations. NEC Article 590, Temporary Installations, specifically covers how wiring, equipment, and methods should be used for temporary power and lighting during construction, demolition, or experimental work. It sets rules for suitable wiring methods and supports, protection from physical damage, proper overcurrent protection, grounding, and disconnecting means, and it requires that temporary installations be removed when the project ends and not be used as a permanent wiring solution. In contrast, other articles address permanent service and feeder requirements, or specific applications, not the temporary, on-site wiring you’d find at a construction site. That focus on temporary installations is what makes the referenced article the correct choice.