What is the maximum length of unsupported flexible metallic conduit (FMC) for equipment utilization?

The maximum length of unsupported flexible metallic conduit (FMC) for equipment utilization is 3 feet. This limitation is set to prevent excessive movement and stress on the conduit, which could lead to damage or failure. FMC is designed to provide flexibility and ease of installation, particularly where movement is necessary or where equipment may require adjustments. However, to ensure safety and reliability, it must be properly supported.

Having a maximum length guideline helps outline the structural integrity and resistance to mechanical strain. If the length exceeds 3 feet without additional support, there are risks of sagging, bending, or other issues that might compromise the conduit’s performance and safety in application.

This standard also helps in adhering to various electrical codes that govern the safe installation of conduits. Proper adherence ensures that the electrical system functions appropriately while minimizing hazards. Understanding these limits is crucial for anyone working with electrical installations to maintain compliance and safety.