A junction box is a device that contains all the wiring junctions or intersections that allows wiring in a house to run to the main power supply by the electrical company. This box is considered practical and more pleasing then exposed electrical wires found in older homes. The design of the box itself can vary slightly. However, there are a few basic things that are common in every junction box design.
Ultimately, the main purpose of this box is to conceal the junctions from sight. The box itself is usually made of hard plastic or metal and is either square or rectangular in shape. A door on the front allows access to the inside; the door may be recessed or may swing upward or downward allowing for access to the junctions. In modern homes, the box is usually installed so the front door opens to view; this makes it easy to install art over the door to keep it from view.
Junction boxes are important because they protect the wiring within and help to contain any sparks in case of an overload. This helps to limit the amount of damage caused in the home itself. A safety switch allows all connections in the box to be shut down in an emergency and fast. Sometimes upgrades to the wiring in a building will determine whether a larger box may need to be installed to accommodate more junctions or cables. However, if the original wiring is in good condition then that will not have to be replaced.
It’s important that regular home inspections are conducted to ensure that a home’s electrical system is working to its fullest potential.