Which of the following is a key function of a Junction Box?

A junction box serves several important functions in electrical systems, and one of its primary roles is to prevent electrical overload. It provides a secure enclosure for electrical connections, ensuring that wires are safely joined and protected from environmental factors. This containment helps manage the flow of electricity and reduces the risk of short circuits, which can lead to overload conditions. By safely managing these connections, the junction box plays a critical role in maintaining the overall efficiency and safety of electrical systems, ultimately protecting transformers and other components from damage due to overload.

The other answers do not accurately reflect the primary functions of a junction box. Storing excess energy is not a role of a junction box, as they are not designed for energy storage. Similarly, providing lighting is not the function of a junction box; while it may be part of a lighting circuit, the box itself does not directly provide light. Lastly, regulating water supply does not pertain to junction boxes, as they are strictly related to electrical connections and not plumbing or fluid regulation.