What do you call a box with a blank cover used for connecting different runs of raceways or cable?

The term for a box with a blank cover designed to connect different runs of raceways or cable is a junction box. A junction box serves the important function of housing electrical connections and providing a safe environment for connecting wires from various sources. Its design allows for the organization and protection of these connections, reducing the risk of short circuits, moisture intrusion, and physical damage.

Junction boxes are integral to electrical systems as they facilitate branching and merging of cables while also allowing for easy access for any future repairs or modifications. Their blank cover is typically used to maintain the safety and aesthetic of the installation while ensuring that any connections are safeguarded from environmental factors.

The other options refer to different types of boxes or have specific applications that do not directly match the function of connecting raceways or cables in the same way that a junction box does. Understanding the specific use of a junction box helps in ensuring proper electrical installation and maintenance practices.