Ground Fault Circuit Interrupter Gfci Definition

Because of this we need to understand what a gfci is how it works and what its limitations are.

Ground fault circuit interrupter gfci definition.

Before the widespread adoption of gfci ground fault circuit interrupter outlets around 800 people died annually in the united states. When a ground fault occurs the gfci quickly in a fraction of a second shuts off the power. A ground fault circuit interrupter is an electrical device installed to protect against severe electric shocks. A gfci or ground fault circuit interrupter is a safety device intended to prevent electrical shock by detecting an improper flow of electrical current and shutting the electrical circuit off very quickly in milliseconds.

The ground fault circuit interrupter or gfci is a fast acting circuit breaker designed to shut off electric power in the event of a ground fault within as little as 1 40 of a second. It works by comparing the amount of current going to and returning from equipment along the circuit conductors. Let s end the confusion with the definition and description of ground fault and ground fault circuit interrupters gfi gfci. The main purpose is to protect people from an electric shock caused when some of the current travels through a person s body due to an electrical fault such as a short circuit insulation.

Injury may still occur in some cases for example if a human falls after receiving a shock or if the person touches both conductors at the same time which an rcd won t. Now thanks largely to the proliferation of gfci technologies particularly in areas near water such as bathroom sinks or in places exposed to rain or standing water that number has dropped to around 200. We need only to look to the nec for the definition of a gfci. Ground fault circuit interrupters gfcis or gfis are safety devices built into outlets that protect against electrical shock.

While both gfi and gfci refer to basically the same thing a device that breaks the current when ground interference is detected there is a slight difference. The basic definition of a ground fault circuit interrupter gfci is a general use device whose function is to interrupt the electric circuit to a load within an established period of time. There is a class a gfci that trips when a ground fault current exceeds 5 milliamps and there is a class b gfci that trips when a ground fault current. Gfci s could also reduce electrocutions and minimize electrical burns and shock injuries.

Their circuitry monitors electrical input.