A duplex electrical outlet features two receptacles for electrical appliances that look like they are stacked on top of each other.
A self-testing GFCI provides periodic, automatic testing for ground faults. If the self-testing GFCI detects a ground fault, then it denies power to the outlet and provides a visual and/or audible indication of the problem.
A self-grounded electrical outlet features copper clips and a mounting screw. This mounting screw is designed to pick up the grounding from the box instead of having to ground it with a grounding wire.
GFCI outlets are required in many potentially wet locations like:
A GFCI (Ground Fault Circuit Interrupter) outlet is designed to reduce the risk of electric shock caused by ground faults by shutting off an electric circuit if the electricity is traveling outside of its intended path. GFCI receptacles work by comparing the currents going in and out and disconnecting them if the difference exceeds 4-6 milliamperes.