695.7 Fire pump voltage drop
What changed in 695.7
Fire pump voltage drop rules were reorganized to match the fire pump installation standard: 15 percent on starting, 5 percent while running, with two starting exemptions.
Point by point
- (A) During motor start, voltage at the controller's line side can't drop more than 15 percent below the controller's rated voltage.
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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
Fire pump voltage drop rules were reorganized to match the fire pump installation standard: 15 percent on starting, 5 percent while running, with two starting exemptions.
2026 NEC®Revised
Concrete around fire pump feeders inside a building now has to be 5 inches thick, or 2 inches with an engineer-documented 2-hour rating. This section was 695.6 in 2023.
Open the 2026 page →More 2023 changes in Article 695
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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