This is what came from the comments phase (from the NEMA report)
(B) Dwelling Units. All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets installed in dwelling unit family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sun rooms, recreation rooms, closets, hallways, or similar rooms or areas shall be protected by a listed arc-fault circuit interrupter, combination type installed to provide protection of the branch circuit.
The vote on this comment was 7-3-1. IBEW, IAEI and IEC voted negative because they believe the expansion should have been to all circuits.
