110.9 Interrupting rating
What changed in 110.9
Reworded to use the code's defined terms. Breakers and fuses still need an interrupting rating no lower than the fault current available on their line side.
Point by point
- The wording now uses the code's defined terms, such as available fault current.
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- 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
Reworded to use the code's defined terms. Breakers and fuses still need an interrupting rating no lower than the fault current available on their line side.
2026 NEC®No change
This section did not change from 2023 to 2026.
More 2023 changes in Article 110
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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