line voltage: meaning, definition, pronunciation and examples
LowFormal / Technical
Quick answer
What does “line voltage” mean?
The voltage supplied to a device or system from an electrical power source, typically measured between the main conductors (lines) of a circuit before any transformation or regulation.
Audio
Pronunciation
Definition
Meaning and Definition
The voltage supplied to a device or system from an electrical power source, typically measured between the main conductors (lines) of a circuit before any transformation or regulation.
In electrical engineering, the nominal operating voltage of a power distribution system, which may differ from the voltage actually used by individual devices (e.g., after stepping down via a transformer). It is a fundamental specification for electrical equipment and infrastructure.
Dialectal Variation
British vs American Usage
Differences
UK English strongly prefers 'mains voltage' for domestic/public supply (e.g., 230V). US English uses 'line voltage' more broadly for both domestic (120V/240V) and industrial supply. In UK technical documents, 'line voltage' is used for industrial/polyphase contexts.
Connotations
In the UK, 'line voltage' sounds distinctly technical/industrial. In the US, it is the standard technical term across contexts.
Frequency
Much more frequent in US English. In UK English, 'mains voltage' is more frequent for general reference.
Grammar
How to Use “line voltage” in a Sentence
The [equipment] operates on/at a line voltage of [value].Measure the line voltage between [phase] and [neutral/ground].A [device] is used to stabilize the line voltage.Vocabulary
Collocations
Examples
Examples of “line voltage” in a Sentence
verb
British English
- The system is designed to line-voltage regulate the incoming supply.
- (Note: 'line-voltage' as compound adjective modifying a verb is rare. Typically used as a noun.)
American English
- The controller will line-voltage compensate for any dips.
- (Note: Same as British, technical and rare.)
adverb
British English
- (No standard adverbial use for this noun phrase.)
American English
- (No standard adverbial use for this noun phrase.)
adjective
British English
- We need a line-voltage thermostat for the heater.
- The fitting is for line-voltage halogen bulbs only.
American English
- Install a line-voltage dimmer switch for these fixtures.
- Check the line-voltage specifications on the motor plate.
Usage
Meaning in Context
Business
Used in procurement and specification documents for electrical equipment.
Academic
Common in electrical engineering textbooks and research papers on power systems.
Everyday
Rare. An electrician might use it when discussing household wiring with a client.
Technical
The primary context. Used in schematics, datasheets, safety standards, and installation manuals.
Vocabulary
Synonyms of “line voltage”
Strong
Neutral
Weak
Vocabulary
Antonyms of “line voltage”
Watch out
Common Mistakes When Using “line voltage”
- Using 'line voltage' to refer to the voltage output of a device (should be 'output voltage').
- Confusing 'line voltage' with 'phase voltage' in three-phase systems (line voltage is between phases, phase voltage is between phase and neutral).
- Misspelling as 'light voltage'.
FAQ
Frequently Asked Questions
In many contexts, yes, they refer to the same thing: the voltage supplied by the utility. However, 'mains voltage' is a more general, everyday term (especially in the UK), while 'line voltage' is a more precise technical term often used in engineering to specify voltage between conductors in a polyphase system.
The nominal line voltage (mains voltage) in UK homes is 230 volts AC at a frequency of 50 Hz. It is supplied as a single phase.
In US homes, the standard line voltage is 120 volts for most outlets and lighting, with 240 volts supplied for major appliances like ovens and dryers. The frequency is 60 Hz.
Typically, no. 'Line voltage' almost exclusively refers to Alternating Current (AC) supplied by a utility grid or generator. For DC systems, terms like 'supply voltage', 'bus voltage', or 'rail voltage' are more common.
The voltage supplied to a device or system from an electrical power source, typically measured between the main conductors (lines) of a circuit before any transformation or regulation.
Line voltage is usually formal / technical in register.
Line voltage: in British English it is pronounced /ˈlaɪn ˌvəʊltɪdʒ/, and in American English it is pronounced /ˈlaɪn ˌvoʊltɪdʒ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms for this technical term]”
Learning
Memory Aids
Mnemonic
Think of the power LINE coming into your house. The LINE VOLTAGE is the pressure of electricity in that line before it reaches your devices.
Conceptual Metaphor
VOLTAGE IS PRESSURE; The electrical line is a pipe, and line voltage is the water pressure in the main supply pipe.
Practice
Quiz
In a UK domestic context, which term is most commonly used as a synonym for 'line voltage'?