SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/elec-nm-4-5ft

After the first support at the box, NM cable must be supported at intervals not exceeding what?

Every 4.5 feet after the first support.

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  1. 2 feet
  2. 4.5 feet ✔
  3. 6 feet

Why: NM cable is secured within 12 inches of a box and every 4.5 feet after that. This keeps the cable from sagging or pulling on terminals.

Huh, didn't know that: Type AC armored cable uses the same 12 inch and 4.5 foot support spacing under 320.30(B).

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References

Answer: 4.5 feet. NM cable is secured within 12 inches of a box and every 4.5 feet after that. This keeps the cable from sagging or pulling on terminals.

  1. EC&M: Moving Violations Video No. 136, Improper Cable Support www.ecmweb.com/moving-violation-videos/moving-violations-video-no-136-improper-cable-support
    every 4.5 ft thereafter
    Checked 2026-10-10.

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