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A junction box protects electrical or telecommunication connections and is made of heavy-duty steel with a watertight interior. They are common in low-density areas and industrial areas, and can be found in commercial and residential buildings. They divide internal systems and aid in billing and surge protection.
A junction box is a metal box that protects electrical or telecommunication connections. The boxes have many different names such as junction boxes, switch cabinets or enclosures. Inside a conduit box, there are wires that connect local power or communications systems to the main system. These gray or green boxes are common in many low-density population areas; high density areas typically have underground boxes to create an extra layer of protection. These boxes are also common within factories, power plants, and other industrial areas, as well as some commercial and residential buildings.
The main purpose of a junction box is to protect the wires inside. These boxes are typically made of heavy-duty steel that is reinforced and insulated against electrical discharges from inside or outside the box. They usually have a gasket around the access panel which creates a watertight interior. The door often has both an internal and external lock to further prevent tampering. In addition to its protective role, a conduit box is also more visually appealing than spliced clumps of wire.
Inside a junction box there are connections for various local systems and for the main line. Because one of these boxes can carry electricity, telephone systems, or cable television, the interiors vary slightly. In most cases, the trunk line enters from the bottom or side of the box and splits into a series of local connectors. Local wires enter the box, usually from below, and connect to their terminals. Using this system, a repair person can selectively arm and disarm local systems without disrupting other users.
The most likely place to come across these boxes is on the street, but that’s not the only way. Many industrial machines require huge amounts of horsepower. Because these systems require access to a larger-than-normal power system, it’s not uncommon for individual machines to end up wired similar to a house. This is often done through a conduit box near the machines. A factory may have several individual junction boxes based on its electrical needs.
Commercial and residential buildings may also have internal junction boxes. These are more common in buildings with multiple unconnected groups of people, such as an apartment or office building. These conduit boxes divide internal systems, giving each subgroup its own access to power and communications. This aids in billing and provides basic surge protection. The most common locations for a duct box in this situation are the utility room or basement.
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