Reply by EEngineer

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Posted on GFCI does not save mouse

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1102 posts in 3610 days

#1 posted 10-25-2013 10:48 AM

You have to understand how GFI works.

The GFI compares current flowing out through the HOT line (black) and compares it to current returning on the neutral line (WHITE). If there is a difference greater than ~5-10 mA, then it will trip. The assumption is that somebody or something is conducting current through a separate path to ground.

The mouse probably got across the line and neutral connections, which the GFI allows, and electrocuted himself.

GFI is not universal protection! If you plug a cord into a GFI circuit, grab the HOT in one hand and NEUTRAL in the other (providing a direct path through your heart) then you WILL electrocute yourself and the GFI will never trip.

If, however, you grab the HOT line in one hand and touch a ground rod with the other hand, the GFI will trip and save your life.

-- "Find out what you cannot do and then go do it!"

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