After listening to the comments and opinions (worth what I paid) of many others I believe they are over-valued. This is what I use and may have stolen it from others. "This home has Arc Fault Circuit Interrupter breakers protecting the bedroom wiring. An arc-fault circuit interrupter is a device intended to provide protection from the effects of arc faults by recognizing characteristics unique to arcing and by functioning to de-energize the circuit when an arc fault is detected. All branch circuits that supply 125-volt, single-phase, 15- and 20-ampere receptacle outlets installed in dwelling unit bedrooms shall be protected by an arc-fault circuit interrupters. This requirement became effective November 1, 2002 as a portion of the National Electrical Code. Most of our localities have yet to enforce this requirement. These breakers were tested by operating the test button on the breaker. I did confirm all receptacles and light fixtures that are required to be protected were de-energized while the AFCI breaker was tripped." (worth what you are paying) Pardon my saying so, but that's incomprehensible InspectorSpeak. Way too many words, way too much jargon. All that talk about phase and amperes and de-energizing and such. You might want to try something like this: The bedroom circuits are protected by Arc Fault Circuit Interruptors (AFCIs), which are designed to prevent arcing (sparks) that could cause a fire. Couple years back, when I was still inspecting houses for sale, I took the advice of an electrical guru, and didn't test the AFCIs. I just confirmed their presence. The only meaningful test for an AFCI would require an arc fault. WJ I only trip AFCIs in vacant homes and then go and check to see if all bedroom lighting, smokies, and receptacles are now out. I know this isn't a functionality test, but rather to see what is connected to these devices. I still sometimes see hardwired bedroom smokies still powered after the AFCI is tripped. I explain to the client what the devices are for and when there were generally required in most areas, although this varies depending upon where the home is located.