The problem here is the circuit the smoke detector is on not the power source for a fire alarm system. Most homes do not have fire alarm systems. This is where you are having the problems.

My Supervisor serves on the UL fire council. He also chaired the NFPA-72 committee on initiating devices for 10 years. He says this is a real problem that although the UL fire council and the NFPA-72 committees have brought this to the NFPA-70 committee's attention they have failed to adress it.

He also says this AFCI protection affects how the detector reads its algorithms in some way. This causes false alarms and other problems.

Jim Yancey-NCDOI