In a feeder circuit installed in parallel using a single flexible metal conduit raceway, how many equipment grounding conductors are required?

In a feeder circuit that utilizes a single flexible metal conduit as a raceway, only one equipment grounding conductor is necessary. This single conductor serves the purpose of providing grounding for all the equipment and components housed within that raceway.

The rationale behind this requirement lies in the grounding system's design principles, where a single conductor can effectively connect the equipment to the ground, ensuring safety and compliance with electrical codes. This grounding conductor acts as a protective measure against potential fault currents, helping to minimize the risk of electric shock or equipment malfunction.

It is also essential to note that the configuration of the feeder circuit using a single raceway allows for efficient use of the grounding system. The installation is designed to minimize the number of conductors, which in turn reduces complexity and potential errors in wiring while still meeting the safety requirements. Thus, in this specific scenario, employing one equipment grounding conductor is appropriate and sufficient for maintaining electrical safety standards.