ground-fault interrupter: meaning, definition, pronunciation and examples
C1/C2Technical
Quick answer
What does “ground-fault interrupter” mean?
A protective electrical device designed to quickly disconnect a circuit when it detects a leakage of current from a circuit to a ground, thus preventing electric shock.
Audio
Pronunciation
Definition
Meaning and Definition
A protective electrical device designed to quickly disconnect a circuit when it detects a leakage of current from a circuit to a ground, thus preventing electric shock.
A safety device installed in electrical outlets, circuit breaker panels, or as part of an appliance cord that monitors the balance of current between the hot and neutral wires. Any imbalance suggests current is leaking, possibly through a person, and triggers a cutoff in milliseconds.
Dialectal Variation
British vs American Usage
Differences
The term 'ground-fault interrupter' or 'GFCI' is predominantly American. In British English, the functionally equivalent device is typically called a 'Residual Current Device' (RCD).
Connotations
In AmE, it is strongly associated with building codes and home electrical safety, particularly in bathrooms, kitchens, and outdoor outlets. In BrE, the equivalent RCD is standard in consumer units (fuseboxes) and on plugs for certain appliances.
Frequency
The term has high frequency in US technical/construction contexts, but very low frequency in everyday UK English, where 'RCD' is standard.
Grammar
How to Use “ground-fault interrupter” in a Sentence
The [noun: electrician] installed [a ground-fault interrupter] in [noun phrase: the kitchen].Vocabulary
Collocations
Examples
Examples of “ground-fault interrupter” in a Sentence
verb
British English
- The RCD interrupter tripped, cutting power to the garden shed.
- The device is designed to interrupt the circuit in under 40 milliseconds.
American English
- The GFCI interrupter tripped when the hair dryer fell in the sink.
- You must interrupt the power at the source before working.
adverb
British English
- The power cut off ground-fault protectively.
American English
- The outlet reacted ground-fault swiftly, preventing a shock.
adjective
British English
- We need a socket with RCD protection for the pond pump.
- The electrician checked the interrupter device.
American English
- The building code requires GFCI-protected outlets in the garage.
- He bought a ground-fault interrupter outlet from the hardware store.
Usage
Meaning in Context
Business
Mentioned in contracts for home inspections, electrical work, and compliance with safety regulations.
Academic
Appears in electrical engineering, building technology, and occupational safety texts.
Everyday
Used by homeowners, DIY enthusiasts, and when discussing home safety features.
Technical
Core term in electrical codes, product specifications, and installation manuals.
Vocabulary
Synonyms of “ground-fault interrupter”
Strong
Neutral
Weak
Vocabulary
Antonyms of “ground-fault interrupter”
Watch out
Common Mistakes When Using “ground-fault interrupter”
- Incorrectly calling any circuit breaker a GFCI.
- Misspelling as 'ground-fault interruptor'.
- Using 'GFI' and 'GFCI' interchangeably, though 'GFCI' is the official term in the US National Electrical Code.
FAQ
Frequently Asked Questions
No. A standard circuit breaker protects against overloads and short circuits (too much current). A GFCI protects against ground faults (current leaking away, which could be through a person).
In the US, they are typically required in bathrooms, kitchens, garages, crawl spaces, unfinished basements, and outdoor outlets—anywhere water and electricity might meet.
It means the device has detected a fault (like current leakage) and has automatically shut off power to that circuit to prevent shock. You press the 'reset' button to restore power after addressing the cause.
The British equivalent is the Residual Current Device (RCD), which serves the same fundamental life-saving function and is commonly found in consumer units (fuse boxes) or as plug-in devices.
A protective electrical device designed to quickly disconnect a circuit when it detects a leakage of current from a circuit to a ground, thus preventing electric shock.
Ground-fault interrupter is usually technical in register.
Ground-fault interrupter: in British English it is pronounced /ˌɡraʊnd fɔːlt ˈɪntəˌrʌptə/, and in American English it is pronounced /ˌɡraʊnd fɒlt ˈɪn(t)əˌrʌptər/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “(to) trip the GFCI (meaning to cause it to cut power)”
Learning
Memory Aids
Mnemonic
Think: FAULT in the GROUND (earth) makes it INTERRUPT the power. It interrupts a fault that could send current into the ground (through you).
Conceptual Metaphor
A GUARDIAN or SENTINEL for electricity; a SMART SWITCH that feels danger.
Practice
Quiz
What is the primary function of a ground-fault interrupter?