Code Change Summary: A new exception has been added to allow branch circuit extensions or modifications up to 6 ft.

AFCI protection requirements first appeared in the 1999 NEC^® and the requirements have changed every code cycle since then.

When branch circuits are modified, replaced, or extended in areas of a dwelling that now require AFCI protection, AFCI protection must be installed to protect these modified branch circuits. This applies even in older homes that were built long before AFCI protection first appeared in the code book. This has been required since the 2011 NEC^®.

In a dwelling unit, AFCI protection applies to 120-volt, single-phase, 15- or 20-ampere branch circuits supplying outlets or devices in kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas.

Now, a new exception allows a branch circuit extension up to 6 ft. to remain without the need to install AFCI protection, as long as no additional outlets or devices are installed. This gives a bit of relief for older homes where a fuse box is replaced with a newer panelboard installed adjacent to the old fuse box location. As long as branch circuits are not extended more than 6 ft. to make terminations on the new circuit breakers, AFCI protection is not required.

Below is a preview of the NEC^®.  See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).