When installing flexible metal conduit (FMC), what must be provided if the total ground-fault current path is over 6' in length?

In the scenario where the total ground-fault current path exceeds 6 feet, it is essential to provide an Equipment Grounding Conductor (EGC). This is a key safety requirement because the EGC ensures a low-resistance path for fault current to flow back to the source, which facilitates the operation of overcurrent devices like circuit breakers or fuses. By having a dedicated EGC, the electrical system enhances the safety of the installation by minimizing the risk of electric shock and ensuring that any fault conditions can be detected and addressed promptly.

The EGC also serves to bond conductive parts of the installation together, promoting proper grounding which can help in preventing electrical hazards. It is particularly important in flexible metal conduit installations where mechanical connections might not always guarantee a complete and reliable path for ground fault currents. Therefore, incorporating an EGC in installations where the grounding path exceeds 6 feet is a critical requirement for maintaining electrical safety standards.