What is a junction box used for?

A junction box is primarily used to house electrical connections within a safe and secure enclosure. Its main function is to protect wiring and connections from physical damage, as well as from moisture and dust. It provides a centralized location for connecting different electrical conductors, making it easier to organize and manage the various wires in a system. This housing allows for a safe environment where electrical connections can be made, inspected, and maintained without exposing the connections to external elements or hazards.

In contrast, while junction boxes may facilitate mounting switches or extending circuits as part of their overall function in an electrical system, these are not their primary purpose. Therefore, the essential role of a junction box remains centered on housing and protecting the electrical connections themselves.