What safety devices are required to prevent arc faults and shocks in residential electrical panels?

• A. Surge protectors only.
• B. AFCIs in living spaces; GFCIs in wet areas.
• C. GFCIs in all areas only.
• D. No devices required.

Answer: (B)

Safety devices protect people and property by addressing two different kinds of faults: arc faults and ground faults. Arc-fault circuit interrupters (AFCIs) monitor for the distinctive arcing patterns that can occur in damaged wiring or cords and will trip to shut the circuit off before an electrical fire starts. They’re required in living spaces—areas where people spend time and where wiring faults are a common fire risk—so bedrooms, living rooms, and similar areas typically have AFCI protection.

Ground-fault circuit interrupters (GFCIs) detect even small leaks of current to ground by comparing the current in the hot and neutral wires. If the current is not equal, indicating a potential shock path through a person or moisture, the device trips almost instantly to prevent electrocution. GFCIs are required in wet areas where the risk of shock is higher, including bathrooms, kitchens, laundry areas, garages, basements with moisture, and outdoor outlets.

So, in residential panels you’ll commonly see AFCIs protecting circuits in living spaces and GFCIs protecting circuits in wet areas. Surge protectors don’t replace these protections, and there are locations where AFCIs or GFCIs aren’t required by code, so the stated pairing is the protective standard.