Energy calculations and load management are covered by which NEC article?

• A. Article 408
• B. Article 220
• C. Article 800
• D. Article 410

Answer: (B)

Calculating loads and managing how much energy the system must carry is addressed by the article that deals with sizing feeders and services. This is Article 220, which covers Branch-Circuit, Feeder, and Service Calculations. It lays out how to determine the connected load, include continuous loads, apply demand factors, and account for noncoincident loads to size the service and feeders properly. It also provides specific rules for general lighting loads, dwelling-unit calculations, and appliance loads so the overall electrical system is sized safely and realistically. The other articles focus on different parts of the system—panelboards and switching devices, lighting equipment, and communications circuits—so they don’t cover load calculations and energy management in the way Article 220 does.