Is running the equipment grounding conductor inside the FMC considered a Code violation?

Running the equipment grounding conductor inside flexible metal conduit (FMC) is permissible according to the National Electrical Code (NEC). FMC is often used for various applications in electrical installations, and it is specifically noted in the NEC as an acceptable raceway for conductors, including equipment grounding conductors.

FMC provides a level of mechanical protection and is also recognized for its ability to act as a grounding path due to its metallic properties. As long as the grounding conductor is appropriately sized and connected, and there are no additional prohibitions based on the installation environment, this practice does not violate the Code.

This understanding is critical for ensuring that installations are compliant and safe. The other options imply restrictions or conditions that are not supported by the NEC regarding the use of FMC for grounding conductors. Thus, the practice of running an equipment grounding conductor inside FMC is aligned with the Code requirements.