A box power junction is the residential electrical connection of the enclosure, to protect the connection and provide a security barrier.
Video Junction box
Construction
A small metal or plastic jumper box can form part of a power line or a thermoplastic sheathed cable system (TPS) in a building. If designed for surface mounting, it is mostly used on ceilings, under the floor or hidden behind access panels - especially in domestic or commercial buildings. The right type (as shown on the left) can be buried inside the cast of the wall (although full concealment is no longer permitted by modern codes and standards) or thrown into concrete - with only the cover visible.
Sometimes it includes a built-in terminal for joining cables.
Similar containers, usually mounted on walls, are used primarily to accommodate switches, sockets, and related connecting cables called pattresses.
The term junction box can also be used for larger items, such as a piece of street furniture. In the UK, such items are often called cabinets. See Enklosur (electricity).
The junction box forms an integral part of the circuit protection system where circuit integrity should be provided, such as for emergency lighting or emergency power lines, or cables between nuclear reactors and control rooms. In such installations, fireproofing around incoming or outgoing cables must also be extended to close the connection box to prevent short circuits in the box during accidental fires.
Maps Junction box
See also
- Cable
- Cable tray
- Centrex
- Integrity circuit
- Distribution boards
- Power services
- Power cord
- Grounding
- Isolation
- Passive fire protection
External links
- NEMA: National Electrical Manufacturers Association
- IBEW: The International Brotherhood of Electrical Workers
- NECA: National Electrical Contractors Association
Source of the article : Wikipedia
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