What Is a Ground Fault Circuit Interrupter?
A ground fault circuit interrupter is an electrical protection device that cuts power when it detects current escaping its intended path. Often called a GFCI, it helps protect people from electric shock. A GFCI may be built into an outlet or installed as a circuit breaker.
Quick Facts About Ground Fault Circuit Interrupter
- Category
- Electrical protection device
- Used for
- Reducing electric shock risk
- Common confusion
- Arc fault protection
- Also called
- GFCI, Ground Fault Interrupter
- Often discussed with
- GFCI Outlet Installation, Outlet Repair
Key Takeaways About Ground Fault Circuit Interrupter
- GFCI protection responds to current imbalance.
- A GFCI outlet may protect other outlets downstream.
- GFCI protection differs from arc fault protection.
How Ground Fault Circuit Interrupter Works
A ground fault circuit interrupter compares the current leaving on the hot wire with the current returning on the neutral wire. The current should follow its intended path through the circuit. A difference suggests some current has escaped, possibly through a person or damp surface.
Related glossary terms: Ground Fault, Arc Fault Circuit Interrupter, Circuit Breaker.
The GFCI opens the circuit when it detects that difference. This action stops power from flowing through the protected part of the circuit. An outlet-style GFCI may also protect other outlets connected downstream.
A circuit breaker in the panel handles a different problem. A standard breaker responds to excess current from an overload or short circuit. An arc fault circuit interrupter responds to certain unwanted electrical arcs, which are different from ground faults.
From the GMB Electric team
When we install a GFCI outlet, we check the wiring and identify any outlets it should protect downstream. We also check the device's operation after installation. The location of the protected outlets affects how we connect the circuit.
Ground Fault Circuit Interrupter in Practice: A Real-World Example
A homeowner wants a GFCI outlet installed near a bathroom sink. The electrician checks the existing wiring and installs the outlet with the proper connections for the circuit.
Related Services
Related Terms
Ground Fault
A ground fault is an electrical fault that occurs when current escapes its intended path and travels toward ground.
Arc Fault Circuit Interrupter
An arc fault circuit interrupter is a protective device that detects electrical patterns linked to dangerous arcing and shuts off power.
Circuit Breaker
A circuit breaker is an electrical protection device that stops current when a circuit draws too much electricity.
Electrical Outlet
An electrical outlet is a connection point that lets a plug draw power from a building’s wiring.
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