All references are based on the 2014 edition of the NEC.
I may catch some flak for this one, but I’m going to stick my neck out and boldly state that AFCI protection is not required when modifications or extensions are made to an existing 120V, single-phase 15A or 20A branch circuit in a dwelling unit bedroom. This may seem to contradict the requirements of Sec. 210.12(B). However, in my interpretation, it would depend upon exactly where those extensions or modificati