What is an outlet box designed for?

An outlet box is specifically designed to hold electrical outlets or receptacles, providing a safe and secure way to connect electrical devices to the wiring system of a building. These boxes are made to accommodate various types of outlets, allowing for the proper mounting and protection of these devices, ensuring that they are firmly held in place and that the wiring connections are secure.

In the context of electrical installations, outlet boxes also play a role in protecting connections from physical damage and reducing the risk of electrical hazards. The NEC outlines requirements for the installation and use of outlet boxes to maintain safety and code compliance.

Other options describe functions that are not primarily the purpose of an outlet box. While some boxes may house circuit breakers or provide support for lighting fixtures, these are typically not classified as outlet boxes. Additionally, while outlet boxes contain wiring, their primary function is to support the receptacles connected to those wires. Therefore, the central purpose of an outlet box is to hold the outlets or receptacles, making the correct choice clear.