555.14 Marina equipotential planes
What changed in 555.14
Equipotential planes are now required at outdoor marina service equipment and disconnects over 250 volts to ground that sit within 10 feet of the water.
Point by point
- Equipotential planes are now required beside outdoor service equipment and disconnects controlling equipment on or in the water.
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- 4 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®NewYou're here
Equipotential planes are now required at outdoor marina service equipment and disconnects over 250 volts to ground that sit within 10 feet of the water.
2026 NEC®Revised
The equipotential plane rule was expanded and clarified, and how to build it is addressed. Bodies of water got the same change.
Open the 2026 page →More 2023 changes in Article 555
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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