What is the minimum internal depth for outlet boxes that do not enclose devices?

The minimum internal depth for outlet boxes that do not enclose devices is established to ensure proper installation and support for wiring systems. A depth of 1/2 inch provides adequate space for the conductors without risking damage or excessive stress on the wires. This depth allows for appropriate installation practices, ensuring that the box can accommodate the necessary connections while maintaining safety and reliability.

Deeper boxes, such as those measuring 3/4 inch or 1 inch, may provide additional space but are not necessary for outlets that do not house devices. Therefore, while other options might be permissible in certain contexts, the 1/2 inch depth is the required minimum for this specific scenario, promoting adherence to established electrical codes and standards for effective and secure electrical installations.