For outlet boxes containing devices or luminaires, what is the maximum weight that must be supported by the box?

The correct answer reflects the requirements specified in the National Electrical Code (NEC) for the load-bearing capabilities of outlet boxes. According to the code, when an outlet box is designed to support devices such as light fixtures or luminaire, it must be capable of supporting a maximum weight of 50 pounds without additional support or being securely fastened to structural components.

This provision ensures that the outlet box is structurally adequate to handle the weight of not only the electrical device attached but also any additional stress that might occur during use. This weight limitation is crucial for fire safety and the prevention of electrical hazards that could arise if an overloaded box were to become dislodged or fail.

Understanding these requirements is essential for anyone involved in electrical installations, as it helps maintain safety standards and ensures compliance with the NEC.