A size ___ AWG equipment grounding conductor is contained in a nonmetallic-sheathed cable marked as 14 AWG.

When dealing with nonmetallic-sheathed cable, it's important to understand the typical configurations of conductors within the cable assembly. In this scenario, if the cable is marked as 14 AWG, the equipment grounding conductor is typically of the same gauge as one of the other conductors in the cable.

In this case, the grounding conductor being 14 AWG fits the standards and practices used in the industry. Nonmetallic-sheathed cables, like Romex, often include a grounding conductor that is the same size as the current-carrying conductors. Therefore, for a cable marked as 14 AWG, the equipment grounding conductor will also be 14 AWG.

This is consistent with the National Electrical Code (NEC) guidelines, which state that the equipment grounding conductor should be sized appropriately based on the circuit it serves, typically maintaining the same gauge as the corresponding circuit conductor for smaller wire sizes. By adhering to these standards, it ensures both safety and proper functioning of the electrical system.