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Junction Box Wiring Basics

Essentially, a junction box houses wire connections in order to split off power from a single source to multiple outlets. For instance, a distribution box might contain one wire power source that is connected through multiple wires to power several different lights.

Junction boxes are usually between 2 ½ to 3 ½ inches long and made of metal or hard plastic. The functional difference between plastic and metal depends whether or not the junction box is supposed to support any weight. Some metal junction boxes can support light fixtures; plastic junction boxes cannot withstand this weight. Additional differences include installation, in that plastic junction boxes are typically quicker and easier to install than metal ones. However, a standard junction box designed to simple cover wire splices can be either metal or plastic.