I do not have the code book with me but I belive there is a exception to afci"s when it comes to medical equipment in the home. When I look up the article I"ll let you know. Although only in my third year as a apprentice Im old enough to remember when the contraversey regaurding GFCI"S was going on. Im not totally sold on the afci"s yet as i belive all the (Bugs) have not been worked out yet. Especially with the smoke and O2 detectors in the house. Touchy subject at best