Diagnostic guide
GFCI vs AFCI Circuit Breakers: Differences and Florida Codes
Last reviewed · Reviewed by the Pro Electrician technical team
Short answer
GFCI (Ground Fault Circuit Interrupter) breakers protect people from lethal electrical shocks in wet areas like kitchens and pools by detecting current leaking to ground. AFCI (Arc Fault Circuit Interrupter) breakers protect homes from electrical fires by detecting dangerous sparking across damaged wires.
GFCI: Life Safety Shock Protection in Wet Locations
Ground fault circuit interrupters monitor the balance of electrical current between the hot and neutral conductors. If as little as 4 to 6 milliamperes of current leaks outside the intended circuit path—such as through water or a human body—the GFCI trips in 1/40th of a second to prevent fatal electrocution.
- Mandatory in kitchens, bathrooms, garages, lanais, pools, and near sinks
- Class A GFCI trips when ground leakage exceeds 4 to 6 milliamperes
- Self-testing GFCI receptacles test internal circuitry automatically every 30 seconds
AFCI: Electrical Fire Prevention Across Living Spaces
Arc faults occur when damaged wires, crushed cords, or loose terminal screws create intermittent electrical sparking. These sparks reach temperatures exceeding 10,000 degrees Fahrenheit, easily igniting nearby insulation and drywall. AFCI breakers use microprocessors to detect the unique electrical signatures of dangerous arcs.
Dual-Function Breakers in Modern Florida Code
Under current National Electrical Code (NEC) standards adopted by Florida, new construction and permitted renovations require dual-function AFCI/GFCI breakers on most 15-amp and 20-amp branch circuits. This single breaker provides comprehensive protection against both shock and fire hazards.
