Junction boxes form an integral part of a circuit protection system where circuit integrity has to be provided, as for emergency lighting or emergency power lines, or the wiring between a nuclear reactor and a control room. Ground wires are spliced together and attached with a pigtail to the box and receptacle. In this arrangement, both the receptacle and metal box are grounded. Oldcastle 11182003 PC1118-18 11x18x18 Polymer Concrete Open Bottom Underground Box. In a system with metal boxes, the pigtail method is considered the most secure. The separate base slab (321640) is recommended for decreasing soil bearing loads. This unit has a 32' round opening to accommodate large cast iron covers in roadways and parking areas. In the UK, such items are often called a cabinet. Pencell PE1324HDH005P3 Green HDPE 13x24x12 In. The 4圆 CMP Splice Box Top (321660) is a pull-box utility structure utilized for underground electrical splices in Central Maine Power service areas. The term junction box may also be used for a larger item, such as a piece of street furniture. Available in a large variety of sizes and styles with either standard, heavy duty or optional overlapping covers. electrical, telephone, fiber optics, CATV, water, gas, etc.). It sometimes includes built-in terminals for the joining of wires.Ī similar, usually wall mounted, container used mainly to accommodate switches, sockets and the associated connecting wiring is called a pattress. For use as splice boxes, pull boxes or equipment enclosures for any application requiring easy access to an underground service (i.e.
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An appropriate type (such as that shown in the gallery) may be buried in the plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into concrete-with only the cover visible. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel-particularly in domestic or commercial buildings. Junction boxes protect the electrical connections from the weather, as well as protecting people from accidental electric shocks.Ī small metal or plastic junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. An electrical junction box (also known as a " jbox") is an enclosure housing electrical connections.
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