Which is a specific NEC reference regarding load calculations?

• A. A specific reference in the NEC regarding load calculations.
• B. A chapter on grounding.
• C. A section on circuit ratings.
• D. A clause on arc-fault protection.

Answer: (A)

The main idea here is that load calculations in the NEC are handled by a dedicated reference that tells you exactly how to determine the size of service and feeder equipment based on calculated loads. The best choice points you to this kind of reference, which in the NEC is Article 220, Load Requirements for Electrical Installations. Article 220 lays out how to compute general lighting loads, dwelling-unit loads, and uses demand factors to size feeders and services. The other topics—grounding (Article 250), circuit ratings (related to articles like 110 on equipment, ampacity, etc.), and arc-fault protection (Article 210.12 and related sections)—cover different aspects of electrical systems and do not provide the specific load-calculation rules. So referencing a dedicated load-calculation article like Article 220 is the correct and specific NEC reference for this topic.