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Installing Romex Through Metal Studs

April 9, 2006

Q: Does the NEC allow romex to be run though metal studs that are provided with a threaded bushing and held in place by a locknut?

A: There are two Code references that apply to this installation. They are 300.4(B)(1) and 334.17. Where nonmetallic-sheathed cable is pulled through slots or holes in metal framing members, the cable must be protected by listed bushings or listed grommets that are securely fastened to the framing members prior to installation of the cable. This requirement is more restrictive in 334.17 because the grommets or bushings must be listed for protection of the cable.

If the threaded bushing that is held in place by a locknut is listed for the purpose of cable protection, it meets the requirements in the National Electrical Code.

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