Code Change Summary: Arc-fault circuit-interrupter (AFCI) protection requirements in dormitory units have been expanded.

The AFCI requirements for dormitory rooms were moved from 210.12(C) to 210.12(B) and the AFCI protection was expanded to include devices and bathrooms.

Now, all 120-volt, single-phase, 15- and 20- ampere branch circuits supplying outlets “and devices” in dormitory bedrooms, living rooms, hallways, closets, “bathrooms”, and similar rooms must have AFCI protection.

A device (according to Article 100) is “a unit of an electrical system, other than a conductor, that carries or controls electric energy as its principal function”. This includes switches. According to the revised code language, an indoor switch (assuming 15-amp, 120-volt) feeding an outdoor luminaire must have AFCI protection, even if the actual lighting outlet being switched is outdoors in an area where AFCI protection is not required.

As well, 15 and 20-amp, bathroom circuits in dorm rooms will require AFCI protection. Keep in mind that any 15 or 20-amp, single-phase, 125-volt bathroom receptacle also requires GFCI protection. Both the device providing AFCI protection and GFCI protection must be located where readily accessible for the recommended monthly testing that everyone has at the top of their to-do list.

Below is a preview of Article 210. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2017 NEC^® edition of NFPA 70.