I am not sure of the time other than the early eighties in Arizona. The
houses that we work on that have one GFCI either in the kitchen or master
bath have the other exterior and bathroom wired through them so they are
Around 1972 they were first required for bathroom outlets. I don't remember
exactly when, but sometime later, they were required for any outlet within 6
foot of a kitchen sink, with each code change they added new locations. I do
believe that garage outlets and outside outlets came shortly after bathroom
outlets, but I could be mistaken
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