Outlet boxes that do not enclose devices or utilization equipment must have a minimum internal depth of:

The minimum internal depth of outlet boxes that do not enclose devices or utilization equipment is set at 1/2 inch. This requirement is established to ensure that there is adequate space within the box, which can accommodate wiring connections and allow for safe and effective installation without risking damage to conductors or creating potential hazards.

An internal depth of 1/2 inch provides enough room to ensure that wiring and connections can lie flat without causing stress or strain. This depth is sufficient for typical installations where devices are not contained within the box, ensuring that something as simple as a few connections or splices can be completed efficiently while adhering to safety standards.

Having insufficient depth could lead to complications, such as overcrowded wiring or connections that are too tight, which could eventually lead to electrical failures or hazards over time. Hence, maintaining this minimum depth is vital to conform to electrical safety codes and to ensure reliable performance of the electrical system.