Never replace a fuse with a penny or any other material that conducts electricity. GFCI GFCI stands for Ground Fault Circuit Interrupter, an electronic device that constantly monitors the amount of current flowing through a circuit and cuts off the electricity at the first sign of an imbalance. Because GFCI's respond to excessive amperage demands faster than fuses or circuit breakers can, they protect you from prolonged electrical shocks by interrupting the current flow before a healthy person can be seriously injured. Inexpensive GFCI's can be hard-wired into your home's electrical service, installed or plugged in at outlets, or built into extension cords. Test and reset GFCI's monthly to ensure they are working properly.
Proper grounding is essential to minimize fire and shock hazards.
Plugs should match outlets. Never cut off or bend the ground pin of a three-pronged plug. This ground connection protects you from severe shock caused by a faulty cord or malfunctioning appliance. Never alter the wide prong of a polarized plug to make it fit into an outdated outlet. Have the outlet replaced and properly grounded.