Is running the equipment grounding conductor on the inside of the FMC a violation of Code if the flex is 8 feet long?

Running the equipment grounding conductor inside flexible metal conduit (FMC) typically raises concerns about potential violations of the National Electrical Code (NEC). The key aspect here is that the NEC generally requires that the equipment grounding conductor be installed in a manner that does not compromise its mechanical protection and accessibility for maintenance, as well as ensuring proper grounding.

For FMC, it is specified that the equipment grounding conductor must not be run inside unless it is part of the conduit assembly designed for that purpose and the total length does not exceed certain limits. In many cases, the NEC might stipulate that using an equipment grounding conductor within FMC is only permissible under specific conditions, including limitations on length, number of bends, and the overall design of the installation.

In this scenario, running the conductor inside the FMC is likely considered a violation of the Code because it does not comply with the guidelines set forth for FMC installations. Since the flex is 8 feet long, and depending on the local Code amendments, this may exceed permissible limits for installing the grounding conductor within the conduit, thus rendering it non-compliant.

Ultimately, because running the equipment grounding conductor in this manner contravenes the requirements stipulated in the NEC, it is classified as a violation of the Code.