What is the purpose of using GFCIs in residential settings?

The use of Ground Fault Circuit Interrupters (GFCIs) in residential settings primarily serves to prevent electrical shocks. GFCIs are designed to monitor the electrical current flowing through a circuit. If they detect a difference between the outgoing and incoming current, which may occur when current is leaking through a person who is grounded, they rapidly shut off the electricity. This action greatly reduces the risk of severe injury or death due to electric shock.

While reducing energy consumption, detecting voltage dips, and enhancing lighting are relevant considerations in electrical installations, they do not represent the primary function of GFCIs. GFCIs are specifically engineered to provide safety against electrical hazards, making them an essential safety device in areas where water and electricity may come into contact, such as kitchens, bathrooms, and outdoor settings.