Ground Fault Circuit Interrupters Flashcards

Questions and Answers

What is a ground fault?

The failure in a circuit that allows current to flow from a live conductor to ground. (correct)

A circuit that operates normally without issues.

An electrical component that enhances circuit performance.

A fault occurring in a static circuit.

What is leakage current?

Low value of current to ground.

What does GFCI stand for?

Ground Fault Circuit Interrupter.

What are the two classes of GFCI?

Class A 5 mA, Class B 20 mA Signup and view all the answers

What does Class A GFCI require?

Protection for all outdoor and bathroom receptacles in dwellings. Signup and view all the answers

What is the principle that GFCI operates on?

The current leaving the circuit is equal to the current entering that circuit. Signup and view all the answers

What is a differential transformer used for in a GFCI?

To pass both the live and neutral conductors of the circuit. Signup and view all the answers

GFCI does not require a _____ to operate.

ground conductor Signup and view all the answers

What is the purpose of the test button on a GFCI?

Allow for testing the operation of the electrical components and its interrupting mechanism. Signup and view all the answers

Study Notes

Ground Fault Circuit Interrupters (GFCIs)

A ground fault occurs when current unintentionally flows from a live conductor to the ground, posing a safety risk.
Leakage current refers to the minimal amount of electrical current flowing to the ground, which can indicate potential faults.

GFCI Overview

A Ground Fault Circuit Interrupter (GFCI) is engineered to cut off power when a current-to-ground fault exceeds a specific threshold, typically lower than standard circuit breakers.
GFCIs are classified into two categories based on their sensitivity:
- Class A GFCIs trip when current to ground exceeds 5 mA.
- Class B GFCIs trip at 20 mA.

Application of Class A GFCI

Class A GFCIs are mandated by code to protect all outdoor and bathroom receptacles in residential settings to prevent electrical shocks.

Operational Principle of GFCI

GFCIs operate on the principle that the current leaving a circuit must equal the current entering it; any imbalance represents a ground fault.

Differential Transformer

In GFCI devices, both live and neutral conductors are routed through a differential transformer to measure current discrepancies.

Ground Conductor

A GFCI is designed to function without the need for a ground conductor, enhancing its adaptability in various installations.

Testing GFCI Functionality

All GFCIs must include a test button that allows users to verify the proper functioning of the device and its internal interruption mechanism.

Description

Test your knowledge on Ground Fault Circuit Interrupters with these flashcards. Each card focuses on key terms and definitions related to electrical safety devices, including concepts like ground faults and leakage currents. Great for students and professionals alike!