AFCI exemptions are allowed for which of the following in dwelling units?

• A. Some exceptions per edition.
• B. All circuits are always required.
• C. Only outdoor circuits.
• D. No exemptions.

Answer: (A)

AFCI protection in dwelling units is widespread but not universal. The main idea is that while most 120V, single‑phase circuits in a dwelling require AFCI protection, the NEC allows some exemptions, and the exact list of those exemptions changes with each edition adopted by a jurisdiction. That’s why the correct choice is that some exemptions are allowed per edition—the rule aims for broad protection, but the specifics depend on which NEC edition is in effect. In practice, you’d consult the edition adopted locally to see which circuits are exempt. The other statements are too absolute: not all circuits are always required, and exemptions do exist.