BrainStuff

How a GFCI outlet works

Oct 3, 2008 · 22 sec · 417.9 kB
0:00-0:22

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A normal 120 volt outlet in the US has two vertical slots and a role hole centered below the slots -- the outlets with a pair of red and black 'test' and 'reset' buttons are known as GCFI outlets. Check out this HowStuffWorks podcast to learn more.

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