What is the common use for a junction box in electrical wiring?

A junction box is primarily used to connect multiple wires and protect electrical connections. This type of enclosure provides a safe and organized space for joining wires from various circuits or devices, ensuring that connections are secure and minimizing the risk of electrical shorts or hazards. By enclosing these connections, junction boxes also protect the wiring from physical damage and provide a barrier against environmental factors, such as moisture or dust, which could lead to electrical failure.

The other options focus on functions that fall outside the primary purpose of a junction box. Reducing voltage levels pertains to transformers or other devices designed for voltage management, while housing circuit breakers relates more specifically to panelboards or load centers. The term power distribution unit typically refers to devices used in specific configurations, such as in data centers, rather than the general and essential function of connecting electrical conductors found in junction boxes.