Choose a wall that holds more than forty-two inches and you have changed which article of the electrical code applies to your yard.

Check the depth rating, because 42 inches is a code threshold

Under the NEC a pool capable of holding water deeper than 42 inches is a permanently installed pool rather than a storable one, and once it is permanent and has a pump, heater or light attached, equipotential bonding is generally required under 680.26. The 2023 edition specifies no bonding requirements for storable pools at all. So the single most consequential thing to read on a pool spec sheet is the maximum water depth, and it is the number people skim past because they are comparing diameters. If the pool you are considering sits just over the line, that is worth knowing before purchase rather than after delivery, since the difference is a bonding grid, a permit and an inspection.

Bonding is not grounding, and the difference is the whole point

Worth understanding rather than memorizing, because the mental model changes what you expect. Grounding concerns the safety of the electrical circuit. Bonding concerns the safety of the pool environment, and it works by equalizing rather than by conducting fault current away: as the guidance puts it, if everything is at the same voltage there is no voltage difference to push current through a person standing in the water while touching a metal rail. That is why the code states the bonding conductor is not required to be extended or attached to any remote panelboard, service equipment or electrode. It is a grid tying metal parts to each other, not a wire running home.

Even an inspector got this backwards in a documented case

Included because it should lower anybody’s confidence in secondhand explanations of this subject, including confident ones. In a forum thread a homeowner reports being told by their local building inspector that the NEC wants the number eight conductor connected to the service panel ground or neutral. A more experienced respondent corrects it plainly: you do not connect the number eight to any circuit conductors, that happens indirectly by connecting the bond wire to the motor, and what you are doing is bonding all the metal parts together. If the person performing the inspection can have the model inverted, a homeowner working from a blog post has no chance. This is a subject to resolve with a licensed electrician and the authority having jurisdiction rather than by reading.

The single perimeter wire may no longer be acceptable, and the guides have not caught up

This is the live part and it is genuinely unsettled. Nearly every guide describes equipotential bonding as a continuous number eight solid copper loop buried around the pool, and a Tentative Interim Amendment to the NEC, TIA 23-9, approved in October 2023, revised 680.26 to clarify that a single number eight copper wire around a pool is no longer an acceptable method in most cases, with structural steel or a copper grid required instead. The backstory is that during the 2020 code cycle a proposal to remove the single conductor allowance was rejected, despite substantiation that a single bare solid copper conductor performed insufficiently in testing by NEETRAC, EPRI and ENEREX. And sources have not converged: an installer guide dated 2026 still describes the single loop as the requirement, while a code reference dated 2025 flags TIA 23-9 as superseding it. Both are current, which means the only reliable answer is your authority having jurisdiction.

The water is a bonded element, and it has a specified contact area

The requirement most likely to surprise somebody, because it is not intuitive that water is a thing you bond. NEC 680.26(C) requires the pool water to be in constant contact with a corrosion-resistant conductive surface of at least nine square inches, which in practice means a listed water bonding device fitted into the circulation system, typically near the skimmer or a return. Nine square inches is a specific area rather than a token connection, and a fitting that has corroded or been replaced with a non-listed part during a repair quietly removes it. If a pool has had plumbing work done, the water bond is worth confirming still exists.

Sheet metal screws are specifically prohibited

A small, concrete prohibition that gets violated because the fasteners are convenient and the pool wall is thin steel. Guidance is explicit that sheet metal screws and rivets cannot be used to connect the bonding conductor, and that stainless machine screws should be used instead, with UL listed direct burial lugs for the connections. UpCodes states the rule flatly: sheet metal screws shall not be used. The reason is that a bonding connection has to remain a reliable low resistance path for decades in a wet environment, and a sheet metal screw in thin gauge steel is neither mechanically nor electrically dependable over that span.

A double-insulated pump reduces the work and does not remove it

This exception gets read as an exemption and it is not. Metal parts of listed equipment with an approved double insulation system are not bonded, which is the actual relief. But the code then requires that a solid eight AWG copper conductor of sufficient length to make a bonding connection to a REPLACEMENT motor be extended from the pool equipotential bonding means to an accessible point near the pump. In other words the grid still has to reach the pump location, deliberately, so that whoever fits a non double-insulated replacement motor in eight years has something to bond it to. Skipping that leaves a future owner with a pump they cannot legally bond without excavating.

GFCI, receptacle distances, and getting it inspected while it is visible

Three items that travel with the bonding and are easier to get right at the same time. GFCI protection is required for all pool pump circuits regardless of voltage, at 240 volts as well as 120, and a useful piece of field knowledge is that most pool pump GFCI trips come from moisture in the motor rather than a wiring fault. Receptacles have a geometry: at least one 125 volt receptacle between six and twenty feet from the inside wall, nothing permitted closer than six feet, and everything within twenty feet on GFCI. And schedule the inspection before backfilling and filling, because a buried bonding conductor is checked while it can still be seen, and an inspector arriving after the pool is full and the yard is restored has no way to verify the thing they are there to verify.