What is the maximum length of unsupported FMC for equipment utilization?

The maximum length of unsupported flexible metal conduit (FMC) for equipment utilization is three feet. This standard is set to ensure safety and maintain the integrity of electrical installations. FMC is designed to provide a flexible means of routing electrical conductors; however, when unsupported over longer distances, it can become susceptible to mechanical stress and bending, which can lead to damage or failure.

Maintaining a limit of three feet for unsupported runs helps to minimize these risks. It ensures that there is sufficient support to prevent excessive sagging and to protect the conductors within the FMC from physical impact, which could otherwise compromise the electrical system's safety and reliability. Industry practice mandates these limitations to align with established electrical codes and standards, which are crucial for proper installation and safe operation.

When equipment is being utilized, adhering to the specified maximum lengths helps maintain consistent performance and adheres to best practices in electrical systems.