What is the maximum length of unsupported flexible metal conduit (FMC)?

The maximum length of unsupported flexible metal conduit (FMC) is 3 feet. This limit is established to ensure proper support and stability of the conduit, which helps prevent damage or stress to the electrical conductors inside. An unsupported length can lead to sagging or movement that could compromise the integrity of the conduit and its contents.

Ensuring that FMC is properly supported is crucial for safety and functionality. The requirement for limiting the unsupported length to 3 feet is based on best practices in electrical installations, recognizing that longer unsupported lengths can lead to installation issues, potential safety hazards, or code violations. Properly supporting the conduit every few feet can help maintain a neat and safe installation, ensuring that the pathways for electrical conductors remain reliable and secure.