I tried to use a CH afci on a circuit with a low voltage lights and dimmer. I had many conversations with Cutler Hammer and the manufacturer of lights and dimmer . They all said my products were compatable, but it did not work. When I used the dimmer it not only tripped that afci but also tripped 3 other afci's in the panel. After 3 tries with differant dimmers that were supposed to be compatable I cut my losses and replaced the cans with line voltage cans and had no more problems.