In which type of wiring system are junction boxes commonly used?

Junction boxes are commonly utilized in conduit wiring systems due to their role in safely housing electrical connections and protecting them from physical damage and environmental factors. In this type of wiring, pathways for electrical conductors are provided by metal or non-metal conduits, which encase the wiring. Junction boxes serve as the points where conductors can be safely joined or split to run to different areas or devices. They help maintain the integrity of the electrical system and facilitate future modifications without compromising safety.

In other wiring systems, such as overhead, underground, or service drop wiring, while junction boxes may be used in certain configurations, they are not as integral to the system as in conduit wiring. Overhead and service drop systems tend to expose wiring to different environmental stresses but rely more on poles and insulating materials without necessarily needing junction boxes at frequent intervals. Underground wiring may use junction boxes, but the physical installation method often relies on direct burial or the use of conduit where junctions are less frequent and more permanently installed.