1. 
   GFI
   General Format Identifier + Ground-Fault Interceptor
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   GFI
   Ground Fault Circuit Interrupters - Special devices capable of opening a circuit when even a small amount of current is flowing through the grounding system.
   Found op http://www.proofrock.com/glossary.html
   
   
3. 
   GFI
   Go For It
   Found op http://www.netlingo.com/acronyms.php
   
   
4. 
   gfi
   1) General format identifier + ground-fault interceptor
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/gfi/1
   
   

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