![]() Ideally, this difference should be zero because both currents cancel. The actuating energy for standard breakers and fuses far exceeds the lethal amount, but most GFCIs trip at around 6 mA.Ī GFCI uses a current transformer to detect the difference between the line current supplied to the load and the neutral current returning from the load. Although fuses and circuit breakers are also protective devices, they are designed to protect equipment and facilities from short circuits and large magnitude electrical faults that could cause electrical fires and property damage. When a GFCI breaker trips, it It quickly disconnects the current flowing through an unintended ground path even if the amount of current is too small to trip a typical circuit breaker. ![]() ![]() GFCIs are designed to prevent bodily harm from electrical faults that could cause electricity to flow through you to ground. However, NFPA 79, the Electrical Standard for Industrial Machinery, also dictates their use in industrial applications. Most states have required GFCI outlets in certain areas of residential installations for decades. The most common types are single-phase electrical outlets used in households near water sources, such as in kitchens, bathrooms, and outdoor receptacles. Fluke virtual demos and product selectorsĪ ground fault circuit interrupter (GFCI) is one of the most common residential, commercial, and industrial safety devices.
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