210.4 Multiwire branch circuits
What changed in 210.4
Mostly reworded. The rule that a multiwire circuit's conductors start in the same equipment now points to an allowance for column-width panelboards.
Point by point
- Editorial cleanup; the basic multiwire branch circuit rules didn't change.
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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
Mostly reworded. The rule that a multiwire circuit's conductors start in the same equipment now points to an allowance for column-width panelboards.
2026 NEC®No change
This section did not change from 2023 to 2026.
More 2023 changes in Article 210
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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