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Pcb In Electronic Product Double-Sided PCB Complete products contract PCB Assembly and manufacturing service Circuit boards 1- to 22-layer PCB layout, fabrication, PCB assembly and box-build Active and passive components sourced directly from original manufacturer by our overseas procurement offices: Tokyo, Singapore, Hong Kong Enclosure cabinet cases, plastic injection molding, metal stamping, manufacture and assembly High precision 0201 size components SMT technology and lead free RoHS technology SMT process We give you the price quote within 4 working days and reply to your e-mail within 6 hours Our building products experience range: industrial, automotive, computing and storage Consumer, instrumentation, medical, networking, peripherals, telecommunications
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Electrical junction box in the process of installation. Electrical conduit and cables come together here for disposition.
Junction box being hooked up to conduit and wiring in a residential building in Canada.
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.
See also
Electrical wiring
Circuit integrity
Fireproofing
Passive fire protection
Cable
Cable tray
Electrical conduit
Short circuit
External links
NEMA: National Electrical Manufacturers Association
Electrical Junction Boxes Article
IBEW: International Brotherhood Of Electrical Workers
NECA: National Electrical Contractors Association
Categories: Cables | Electrical wiring(and so on)
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