While GFCI outlets offer reliable protection compared with standard outlets, they aren't meant for every type of electrical device. Some items should never be plugged into a GFCI, as they could ...

Locate the circuit breaker or fuse that controls the outlet you plan to replace and shut off the power to the circuit. Plug a lamp, radio or the GFCI tester into the outlet to test for power and ...

The typical GFCI outlet cost ranges from $130 to $300, with a national average of $210 for this type of outlet installation.