Junction box

Junction box

An electrical junction box is a container for electrical junctions, usually intended to conceal them from sight and to some extent to eliminate tampering. It can be a small metal or plastic container, such as those intended to form part of wiring, especially in buildings; in this type of application, it may form part of an electrical conduit wiring system, or may be buried in the plaster of a wall, concealed behind an access panel or cast into concrete with only the lid showing. It may or may not include terminals etc. for joining wires. A similar container used for joining wires to electrical switches or sockets is called a pattress.

The term may also be used for a larger item, e.g. of street furniture; in the UK, this is sometimes called a cabinet. See Enclosure (electrical).

Junction boxes form an integral part of a circuit protection system. In the event circuit integrity has to be provided, as may be necessary for emergency lighting or emergency power lines, or the wiring between a nuclear reactor and a control room. In such an event, the fireproofing afforded to the incoming or outgoing cables must also be extended to cover the junction box to prevent short circuits inside the box during an accidental fire.

ee also

* Electrical wiring
* Circuit integrity
* Fireproofing
* Passive fire protection
* Cable
* Cable tray
* Electrical conduit
* Short circuit

External links

* [http://www.nema.org/ NEMA: National Electrical Manufacturers Association]
* [http://www.ask-the-electrician.com/electrical-junction-boxes.html Electrical Junction Boxes Article]
* [http://www.ibew.org/ IBEW: International Brotherhood Of Electrical Workers]
* [http://www.necanet.org/ NECA: National Electrical Contractors Association]

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Look at other dictionaries:

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  • junction box — noun a box containing a junction of electric wires or cables …   English new terms dictionary

  • junction box — noun : a box (as of metal) for enclosing the junction of electric wires and cables …   Useful english dictionary

  • junction box — /ˈdʒʌŋkʃən bɒks/ (say jungkshuhn boks) noun a box in which a connection is made between several electric circuits …   Australian English dictionary

  • junction box — Elect. an enclosure that houses electric wires or cables that are joined together and protects the connections. [1895 1900] * * * …   Universalium

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