690.4 PV general rules
What changed in 690.4
New 690.4(G) settles PV math: round the final volt or amp result to the nearest whole number, dropping fractions under 0.5.
Point by point
- New 690.4(G) covers PV voltage and current calculations that end in a fraction.
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Get the whole breakdown
- 3 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
The list of PV equipment that must be listed or field labeled grew, and electronic power converters are allowed where they aren't readily accessible.
Open the 2020 page →2023 NEC®Revised
New 690.4(G) covers floating PV arrays on ponds, lakes and other water: equipment must be identified for that use and wired to handle movement.
Open the 2023 page →2026 NEC®RevisedYou're here
New 690.4(G) settles PV math: round the final volt or amp result to the nearest whole number, dropping fractions under 0.5.
More 2026 changes in Article 690
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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