I have been a contractor for almost 25 years and I have been told about 10 different interpretations by 10 different permitting jurisdictions. Can any one give me the definitive rules that apply to what receptacles in a residence must be on AFCI? And also please does every light need to be on an AFCI? Why does a 240 volt heater not have to be on the AFCI circuit but 120 volts do? I have heard everything. Please help.