408.6 Short-circuit current rating
What changed in 408.6
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.
Point by point
- The equipment's short-circuit current rating still can't be lower than the available fault current.
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- 3 more points on exactly what changed
- The 2017 rule next to the 2020 rule, side by side
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This section across NEC® editions
2020 NEC®RevisedYou're here
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.
2023 NEC®No change
This section did not change from 2020 to 2023.
2026 NEC®Revised
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.
Open the 2026 page →More 2020 changes in Article 408
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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