When purchasing a GFCI, what factors should be considered?
First, consider whether the GFCI carries the UL listing mark or that of some other recognized testing laboratory. For a circuit breaker GFCI, the make and model of the panel box determine whether the GFCI will fit the panel box. Recently, a combination light/switch/receptacle type GFCI has become available. This is for bathrooms where the only receptacle outlet is in the lighting fixture. A consumer can replace the light switch with a combination switch/receptacle GFCI.