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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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A GFCI (Ground Fault Circuit Interrupter) is an electrical safety device designed to protect against electric shock by quickly disconnecting power when it detects an imbalance in the circuit. This can occur if electricity leaks from a damaged appliance or through a person coming into contact with water. The rapid response helps prevent electric shocks and potential electrocution.

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10mo ago
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Q: A gfci helps prevent shocks by instantly switching off in dangerous situations?
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