342.30 Securing IMC
What changed in 342.30
IMC fished into existing or prefinished walls no longer has to be secured, as long as it is one unbroken length. RMC got the same change.
Point by point
- New exception: an unbroken length of IMC fished into an existing or prefinished wall does not need to be fastened.
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Get the whole breakdown
- 3 more points on exactly what changed
- The 2020 rule next to the 2023 rule, side by side
- Why it changed
- What to do and check on the job
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This section across NEC® editions
2020 NEC®No change
This section did not change from 2017 to 2020.
2023 NEC®RevisedYou're here
IMC fished into existing or prefinished walls no longer has to be secured, as long as it is one unbroken length. RMC got the same change.
2026 NEC®No change
This section did not change from 2023 to 2026.
More 2023 changes in Article 342
This is a plain-English summary, not the NEC®'s exact wording. Always check the full section in the NEC® edition your area has adopted, plus any local amendments.
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