SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/elec-race-fmc-6ft

Flexible metal conduit (Article 348) is mainly used for what?

Mostly the final 6 feet or less to the equipment.

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  1. Long underground main feeders
  2. Direct burial in concrete
  3. The final 6 feet to moving or vibrating equipment ✔

Why: FMC bends and flexes, so it connects rigid conduit systems to motors and other equipment that vibrate or move. It is not meant for long runs.

Huh, didn't know that: In high vibration, 348.60 requires a wire-type equipment grounding conductor in the FMC.

The dad joke
Why was the flex conduit good at yoga? It could bend anywhere.
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References

Answer: The final 6 feet to moving or vibrating equipment. FMC bends and flexes, so it connects rigid conduit systems to motors and other equipment that vibrate or move. It is not meant for long runs.

  1. EC&M: Choosing the Right Raceway www.ecmweb.com/national-electrical-code/code-basics/article/20896212/choosing-the-right-raceway
    primarily used for the final 6 ft or less of raceways.
    Checked 2026-10-10.

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