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A junction box is an enclosure used to protect the connection (node) of two or more current carrying wires. This level of protection is required to prevent fire and maintain a tight, stable and reliable connection for many years. The use of connectors eliminates the need to lay wires from each socket or switch back to the main service panel.
When junction boxes are used for each electrical connection in a building, it is much easier to locate and repair any electrical problems that arise. When some connections are made without junction boxes, such as interior wall cavities or hidden ceiling or attic locations, the possibility of future problems increases. Each electrical connection shall be located in a protective box that is easy to find and access.
Should I buy plastic or metal junction boxes?
Electrical junction boxes can be made of metal or plastic, and they have many names. This is because they have different shapes and sizes for different purposes. A box like the above can be simply used to protect the connection of multiple wires and cover it with a flat plate. The electrical box on the right is also used for sockets or wall switches. Other boxes are used for hanging ceiling fixtures and other purposes. Some boxes are made specifically for new buildings, while others are made for renovation work. There are many types of electrical junction boxes to choose from, many of which you can see in any household goods store.
Add junction box
Whether you want to add a new socket in the kitchen, install a ceiling fan where you don't currently have, or add a new special circuit in your garage, you need some kind of junction box. Although some convenient homeowners are able to do this work by themselves, for most people, we recommend that you have a licensed electrician do this work for you. It can be dangerous when added, and it can be dangerous if it causes an electrical fire.