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The GFCI device compares electrical current on one leg of the breaker to the electrical current on the other leg and if there is any measurable difference, the GFCI shuts off immediately, before you can be harmed. The assumption is, if there is a difference, some of the electrical energy must be going through your body. Not a perfect solution, but not bad.

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Does Epinephrine help prevent against stressful situations?

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Related Questions

What is a special outlet that helps prevent shocks by instantly switching off in dangerous situations?

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