These two acronyms are basically the same thing. GFCI stands for Ground Fault Circuit Interrupter. GFI is just a shorted form of the same acronym, Ground Fault Interrupter. These devices were invented in the 1970s and have been saving lives ever since, both in the home and on the construction sites. Are your GFCIs, or GFIs, working properly? Did you know that lighting from 25 miles away can render a GFCI useless? For a proper assessment, it is best to call a licensed electrician or an electrical contractor in Las Vegas or Southern Nevada to have a proper see if you and your family are being properly protected or not.