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National average, does anyone know how many homes in the US are electrically ungrounded?

Question asked by ejunhan001 on May 8, 2017

Hi there, 


I'm currently doing research on ungrounded homes for a study, and I'm trying to get a national average of how many homes in the US are ungrounded? Also, I'm looking to identify what region in the US ungrounded homes are most commonly found. Any help or direction where I can go to get this information would be greatly appreciated. Thanks everyone.