Which of the following is NOT a location for device boxes in branch-circuit wiring?

In branch-circuit wiring, device boxes serve specific purposes to allow for the safe management of electrical connections. Junction points, switch points, and conductor splice points are all locations where it is essential to house connections or devices that facilitate the functionality of an electrical circuit. Junction points are where wires meet, switch points are where switches control the flow of electricity, and conductor splice points contain splices which connect different segments of wiring.

On the other hand, transformer mounts are typically areas where transformers are installed. While transformers play a crucial role in electrical systems, they do not serve as junctions for branch circuit wiring in the same way that the other locations do. Thus, device boxes are not normally located at transformer mounts, making it the right choice for the question. This emphasizes the importance of understanding the function and placement of device boxes within a branch-circuit wiring system to ensure proper electrical safety and functionality.