Grounding conductors are required for circuits that exceed how many amperes using Flexible Metal Conduit?

Grounding conductors play a crucial role in electrical systems by providing a low-resistance path for fault currents, ensuring safety and preventing electrical shock. In circuits using Flexible Metal Conduit (FMC), the National Electrical Code (NEC) stipulates that grounding conductors are required for circuits that exceed 20 amperes. This requirement is in place because higher amperage can increase the risk of electric shock or fire, and grounding helps mitigate those risks.

When circuits are rated above this threshold, the necessity for a grounding conductor becomes more pertinent as the potential for fault conditions increases. Thus, circuits over 20 amperes must include proper grounding for enhanced safety and compliance with electrical codes.

The other options reflect lower amperage levels which do not yet necessitate grounding conductors for circuits utilizing Flexible Metal Conduit, thereby highlighting the importance of understanding both the amperage thresholds and the safety protocols critical in electrical installations.