junction box

American  

noun

Electricity.

1. an enclosure that houses electric wires or cables that are joined together and protects the connections.

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junction box British  

noun

1. an earthed enclosure within which wires or cables can be safely connected

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junction box Scientific  

/ jŭngk′shən /

1. An enclosure within which electric circuits, such as the electrical wiring for different sections of a building, are connected to other circuits, such as outside power sources. Junction boxes are very common in telecommunications circuitry and are used to protect the connections and provide easy access to them.

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Etymology

Origin of junction box

First recorded in 1895–1900

Example Sentences

The "Rocket Man" singer alleged that all three of the family's landlines "were hacked, including the junction box at the end of the road".

From Barron's • Feb. 6, 2026

Highly specialized equipment and workers are needed to separate the aluminum frame and junction box from the panel without shattering it into glass shards.

From Los Angeles Times • Jul. 14, 2022

They’ll also remove or repair a cooling fan ground wire that connects to the junction box.

From Seattle Times • Jul. 8, 2022

It does not mount to a standard outdoor junction box and isn’t a great drop-in upgrade for an existing non-camera floodlight.

From The Verge • Dec. 7, 2021

For the lighting circuits a flexible steel conduit is used, and a special junction box.

From The New York Subway Its Construction and Equipment by Anonymous