What defines a single-gang box?

A single-gang box is specifically designed to accommodate a single electrical device, such as a switch or an outlet. The term "gang" refers to the number of devices that can be mounted within the box, and a single-gang box is the most common configuration used in residential and commercial electrical installations for individual devices.

This definition highlights that the primary function of a single-gang box is to contain one device safely and securely, providing the necessary space for wiring and connections while maintaining code compliance for safety and functionality. The design is compact, making it suitable for standard applications where only one device is required.

In contrast, options referring to multiple devices or large devices would not apply, as a single-gang box is specifically intended for single-device use. Similarly, the mention of outdoor use does not pertain to the distinguishing characteristics of a single-gang box, as these boxes can be appropriate for both indoor and outdoor settings, depending on the specific type and rating of the box.