408.6 Short-circuit current rating
What changed in 408.6
Outside one- and two-family dwellings, switchboard and panelboard field labels must now show the equipment's SCCR, and the fault current math has to be kept on hand and updated after changes.
Point by point
- Rewritten as a five-item list that applies everywhere except one- and two-family dwellings.
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- 4 more points on exactly what changed
- The 2023 rule next to the 2026 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®Revised
Switchboards, switchgear and panelboards now need a field marking showing available fault current and the date it was figured, except in one- and two-family dwellings.
Open the 2020 page →2023 NEC®No change
This section did not change from 2020 to 2023.
2026 NEC®RevisedYou're here
Outside one- and two-family dwellings, switchboard and panelboard field labels must now show the equipment's SCCR, and the fault current math has to be kept on hand and updated after changes.
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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