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Where no other bonded part touches the pool water, a conductive surface must expose how much area to the water?
9 square inches in direct contact with the pool water.
- At least 1 square inch
- At least 36 square inches
- At least 9 square inches ✔
Why: Vinyl and fiberglass pools have no metal touching the water. A corrosion-resistant conductive surface must be in direct contact with the water and expose at least 9 square inches.
Huh, didn't know that: That surface must stay exposed to the water at all times.
I used to date an electrician. Boy, she could really light up a room!
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References
Answer: At least 9 square inches. Vinyl and fiberglass pools have no metal touching the water. A corrosion-resistant conductive surface must be in direct contact with the water and expose at least 9 square inches.
- EC&M: Understanding Equipotential Bonding Requirements for Swimming Pools www.ecmweb.com/national-electrical-code/article/21268735/understanding-equipotential-bonding-requirements-for-swimming-pools-fountains-and-similar-installations
expose at least 9 square inches of surface area to the pool water at all times.
Checked 2026-10-10.
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